Forza Horizon 5 Tuning Guide

Part 2 - General Tuning

This part explains how to setup cars in a way that they will work good for road and street racing.

 

This also serves a basis for off-road tuning which will be covered in Part 3 so make sure to read this first before advancing to these topics.

Understanding Tuning Relevant Car Properties

As in Part 1 explained car type, body type and drive type are the most important factors when it comes to tuning, but there are also other individual car properties that have great impact on the tuning, most notable are power and weight and key upgrades like suspension or differential.

The following table gives an overview which car property affects which tuning area. Please refer to the related section in the tuning guide for detailed explanations.

Car Property           Tires        Gearing       Alignment         ARBs         Springs         Dampers       Aero        Brakes       Diff

                                                                                           

Car Type                      ✓                                                                                                                                                     ✓                 

Body Type                                                                 ✓                     ✓                  ✓                     ✓                                                      ✓

Drive Type                   ✓                                           ✓                     ✓                  ✓                     ✓                  ✓                 ✓              ✓

Power                                                ✓                                                                                                               ✓

Weight                         ✓                                                                   ✓                  ✓                     ✓                  ✓           

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Suspension                                                               ✓                                          ✓                     ✓                                      ✓              ✓     

Chassis Reinf.                                                                                   ✓                  ✓                            

Transmission                                 ✓

Differential                                                                                                                                                                                           ✓

Tire Compound          ✓                                                                                                                                       

Tire Width                                                                ✓                                           ✓

Aero Kits                                           ✓                                                                   ✓                    ✓                   ✓

New in Horizon 5 

Tires

Tire pressure tuning first and foremost depends on the used tire compound. The general rule here is the softer the tire compound the higher tire pressure is required. Reasoning for that is that besides grip tires also provide a basic level of rigidity and therefore control. Softer tire compounds like Sport or Race compound provide more grip but also have less rigidity than Stock or Street compound. Increased tire pressure compensates for lower level of rigidity of softer compounds.

Off-road tires generally require lower tire pressures than street, sport or race compounds for best performance.

 Changed in Horizon 5 Tire pressure tuning in Horizon 5 has changed since Horizon 5 takes place in a much warmer region than Horizon 4, therefore tire pressures generally need to be increased by 3 psi as compared to Horizon 4 for best performance.

Generally front and rear tire pressures should be the same. Having different tire pressures on front and rear tires creates over- or understeer effects and is only required when tuning for speed, grip or specific tracks.

Tire Compound          Tire Pressure

Stock                                      31.0     

Street                                     31.0     

Sport                                      31.5     

Semi Race                             32.0            New in Horizon 5 

Semi Race  Horizon             32.0            New in Horizon 5 

Race Slicks                             32.5

Snow                                      30.5       

Vintage Race                         29.0            New in Horizon 5 

Vintage Race White Wall     29.0            New in Horizon 5 

--------------------------------------------------------------------------------------

Off-road                                25.0    

Rally                                       25.5    

Off-road Race                       26.0    

Vintage Rally                         22.5   

--------------------------------------------------------------------------------------

Drift                                        35.0            New in Horizon 5 

--------------------------------------------------------------------------------------

Drag                                        20.5  

If you are running on stock tire compound keep in my mind that the stock tire compound may not be Stock compound for all cars. Generally modern race cars are equipped with race slicks (only drag compound is available as upgrade), while vintage race cars are equipped with vintage race compound. Likewise for some sports cars the stock tire compound is sport compound. And for most off-road cars the stock compound is off-road compound or off-road race compound (off-road race compound is actually denoted with the Offroad tires icon in-game).

Race Cars and High Performance Cars

Aside from tire compound tire pressure tuning also depends on the type of car as high performance cars and race cars require higher tire pressure for improved control than street or sports cars. That means for high performance cars and race cars you need to add an additional 0.5 psi on top of the base tire pressure for best tire performance.

Car Type                            Tire Pressure Offset

High Performance Car                 +0.5

Race Car                                         +0.5

Race Truck                                     +0.5

Prototype Race Car                      +0.5

GP Race Car                                   +0.5

------------------------------------------------------------

Off-road Race Truck                     +0.5 

Relevant Car Upgrades

Car Property                 Change                  Effect on Tire Pressure

Tire Compound              Change                      Increase/Decrease

Alignment

Camber

Camber settings are car type specific. As a general rule of thumb: older cars require less static camber because the more flexible chassis / suspension creates more dynamic camber. Modern cars with more rigid chassis / suspension can be run with higher camber. 

Static camber should be set so that the (dynamic) camber on the apex when you start accelerating out of a turn is around 0 to maximize tire contact patch which in turn provides maximum tire grip. This is especially important for the driven wheels. 

Front camber is usually higher than rear. Exception are open-wheel cars with its very unique suspension geometry that requires higher rear camber.

Car Type                               Usual Camber Range

                                                  (Race Suspension)

Utility Car                                     -3.0 to  0.0

Street Car                                     -3.0 to  0.0

Sports Car                                    -3.0 to  0.0

High Performance Car               -2.5 to -1.0

------------------------------------------------------------------------

Race Car                                       -2.5 to -1.5

Race Truck                                    -2.0 to 0.0

Prototype Race Car                     -2.0 to -1.0

GP Race Car                                  -3.5 to -1.5

------------------------------------------------------------------------

Rally Sports Car                            -3.0 to  0.0

------------------------------------------------------------------------

Off-road Buggy                            -2.5 to -1.0

Off-road Car                                 -2.5 to -1.0

Off-road Sports Car                     -2.5 to -1.0

Off-road Truck                              -3.0 to -2.0

Off-road Race Truck                    -2.5 to -2.0

The ranges given account for different body types within the car type.

​Rally and off-road suspension generally require higher camber than race suspension. Simply reduce race suspension front camber by 1.0 and rear camber by 0.5 to get required camber for rally or off-road suspension.

Car Type                               Usual Camber Range

                                  (Rally / Off-road Suspension)

Utility Car                                     -4.0 to -0.5

Street Car                                     -4.0 to -0.5

Sports Car                                    -4.0 to -0.5

High Performance Car               -3.5 to -1.5

-----------------------------------------------------------------------------

Race Car                                       -3.5 to -2.0

Race Truck                                    -3.0 to -0.5

Prototype Race Car                     -3.0 to -1.5

GP Race Car                                  -4.5 to -2.0

-----------------------------------------------------------------------------

Rally Sports Car                            -4.0 to -0.5

-----------------------------------------------------------------------------

Off-road Buggy                            -3.5 to -1.5

Off-road Car                                 -3.5 to -1.5

Off-road Sports Car                     -3.5 to -1.5

Off-road Truck                              -4.0 to -2.5

Off-road Race Truck                    -3.0 to -0.5

The ranges given account for different body types within the car type.

Open Wheel Cars

Open wheel cars require lower rear camber than regular closed wheel cars to compensate for less body roll on the rear.

                                             Rear Camber Offset

Open Wheel Car                             -1.0

Relevant Car Upgrades

​Keep in my mind that tire width directly influence camber settings. This is due to wider tires increase contact patch, so for optimal grip camber needs to be reduced as well.

Car Property              Change                  Effect on Camber

Front Tire Width         Increase               Reduce front camber

Front Tire Width         Decrease             Increase front camber

Rear Tire Width          Increase               Reduce rear camber

Rear Tire Width          Decrease             Increase rear camber

Toe

I usually don't touch toe as this from my experience creates almost always unwanted imbalance during turning.

The only exception is that I use rear toe-in (max. -0.3) for older road and off-road cars as I find this improves accelerating out of turns, i.e. reduces on-throttle understeer.

Car Type                                    Rear Toe

Utility Car                                    -0.3-0.0

Street Car                                    -0.3-0.0

Sports Car                                   -0.3-0.0

High Performance Car                  0.0

--------------------------------------------------------

Race Car                                          0.0

Race Truck                                      0.0

Prototype Race Car                       0.0 

GP Race Car                                    0.0

--------------------------------------------------------

Rally Sports Car                         -0.1-0.0

--------------------------------------------------------

Off-road Buggy                          -0.3-0.0 

Off-road Car                               -0.3-0.0 

Off-road Sports Car                   -0.3-0.0 

Off-road Truck                            -0.3-0.0 

Off-road Race Truck                   -0.3-0.0

The ranges given account for different body types within the car type.

Caster

Caster is also a car type specific setting. As a general rule of thumb modern sports cars, high performance cars and race cars require higher caster than street cars or trucks to stabilize the car while cornering. Older cars can be run with the standard 5.0 caster. 

Car Type                                    Caster

                                          (Race Suspension)

Utility Car                                       5.0

Street Car                                       5.0

Sports Car                                   5.0/6.5   Changed in Horizon 5  

High Performance Car                 5.0 

--------------------------------------------------------------

Race Car                                      5.0/6.0   Changed in Horizon 5  

Race Truck                                     6.0       Changed in Horizon 5  

Prototype Race Car                   5.0/6.0   Changed in Horizon 5  

GP Race Car                                5.0/6.0   Changed in Horizon 5  

--------------------------------------------------------------

Rally Sports Car                          5.0/6.5   Changed in Horizon 5  

--------------------------------------------------------------

Off-road Buggy                              6.5

Off-road Car                                   5.0

Off-road Sports Car                      6.5

Off-road Truck                               5.0        Changed in Horizon 5  

Off-road Race Truck                  2.0/5.0

The ranges given account for different body types within the car type.

For most cars rally and off-road suspension require different caster settings due to different suspension geometry compared to race suspension. As a general rule of thumb sports, race and rally cars require high caster, off-road cars and trucks require medium caster and off-road race cars and trucks require low caster. 

Car Type                                    Caster

                               (Rally / Off-road Suspension)

Utility Car                                       5.0      Changed in Horizon 5  

Street Car                                       5.0      Changed in Horizon 5  

Sports Car                                      6.5

High Performance Car                 6.5 

---------------------------------------------------------------------

Race Car                                         6.0      Changed in Horizon 5  

Race Truck                                     6.0      Changed in Horizon 5  

Prototype Race Car                      6.0      Changed in Horizon 5  

GP Race Car                                   6.0      Changed in Horizon 5  

---------------------------------------------------------------------

Rally Sports Car                            6.5

---------------------------------------------------------------------

Off-road Buggy                             2.0

Off-road Car                                  5.0      Changed in Horizon 5  

Off-road Sports Car                      6.5      Changed in Horizon 5  

Off-road Truck                               5.0      Changed in Horizon 5  

Off-road Race Truck                     2.0

Anti-roll Bars

Anti-roll bars (ARBs) control the weight transition between left and right (or inner and outer) wheels during cornering. Softer ARBs create more body roll leading to more weight shifting to the outer wheels. Stiffer ARBs reduce body roll and thus provide less weight shifting during cornering. Soft ARBs provide more grip during cornering but can result into sluggish car behaviour when setup too soft. Stiff ARBs provide more control during cornering but can result into harsh and unpredictable car behaviour when setup too stiff. 

Generally ARBs need to be setup in relation to chassis stiffness and vehicle weight, i.e. the more rigid the chassis is the lower the ARBs can be set. Likewise the less the car weights the lower the ARBs can be set.

20/20 is good middle ground for modern road cars around 3000lbs and 50% weight distribution and corresponds to an ARB stiffness of around 63%. Increase ARBs for cars with more weight and / or less rigid chassis (e.g. older cars). Decrease ARBs for cars with less weight and / or more rigid chassis (e.g. race cars).

Front and rear ARB distribution has a relation to weight distribution, so in general a car with more front weight should have also higher front ARBs than rear. This is however not as simple as 1:1 distribution according to weight distribution because springs and dampers also affect car balance during turning. 

A good starting point for ARB distribution for RWD cars is 1 per 1% weight distribution difference to 50%, i.e. for 51% front weight distribution the front ARB should be 1 higher than the rear ARB. Older cars and muscle cars require higher spread (>1 per 1%) while race cars require lower spread. 

Example: ARBs for a modern RWD road car with 3000lbs @ 51% wd would be:

ARB distribution = 51%-50% = 1% --> 1*1 = 1, divide by 2 to split equally between front and rear --> 0.5

Front: 20 + 0.5 = 20.5 and Rear: 20 - 0.5 = 19.5.

Car Type                         ARB stiffness         ARB distribution

                                                                                    (RWD)

Utility Car                             63-66%                      1.00-2.95

Street Car                             63-66%                      0.98-1.50

Sports Car                            61-65%                      0.66-1.00

High Performance Car       40-46%                      0.55-0.65

----------------------------------------------------------------------------------------

Race Car                               35-62%                      0.35-0.80

Race Truck                              15%                              0.35

Prototype Race Car             28-48%                      0.25-0.35

GP Race Car                            18%                              0.35

----------------------------------------------------------------------------------------

Rally Sports Car                   60-63%                      0.70-0.77

----------------------------------------------------------------------------------------

Off-road Buggy                    61-65%                      1.45-2.95

Off-road Car                         61-65%                      1.45-2.95

Off-road Sports Car             61-65%                      1.45-2.95

Off-road Truck                      61-65%                      1.55-3.00

Off-road Race Truck             61-65%                      1.00-2.53

The ranges given account for different body types within the car type.

ARB Stiffness

ARB stiffness is a metric to calculate ARB base values based on the cars weight and a weight distribution of 50%.

The formula to determine ARBs for a given ARB stiffness and a weight distribution of 50% looks like this:

Base ARB = (Weight / 2) / (200 - 200 * ARB stiffness)

Example: Street Car with 2500 lb and ARB stiffness of 63% and ARB distribution of 1.00:

Base ARB = (2500 / 2) / (200 - 200 * 63%) = 16.89 

 

Depending on the cars weight distribution and ARB distribution front and rear ARBs are distributed around the ARB base value:

Weight Distribution              Front ARB           Rear ARB

          52%                                     17.89                  15.89

          51%                                     17.39                  16.39

          50%                                     16.89                  16.89

          49%                                     16.39                  17.39

          48%                                     15.89                  17.89

FWD Cars

For FWD cars generally ARBs need to be setup in reverse to RWD with regard to ARB distribution. So a good starting point would be -1 per 1% weight distribution for modern road cars around 3000lbs. 

Example: ARBs for a modern FWD street car with 3000lbs @ 60% wd would be:

ARB distribution = 60%-50% = 10% --> 10*-1 = -10, divide by 2 to split equally between front and rear --> -5

Front: 20 + (-5) = 15 and Rear: 20 - (-5) = 25

AWD Cars

AWD cars require a lower ARB distribution than RWD cars to combat inherent understeer. A good starting point is 0.66 -per 1% weight distribution for AWD cars, i.e. for 51% front weight distribution the front ARB should be 0.66 higher than rear ARB.  

Relevant Car Upgrades

Adding chassis reinforcement upgrade increases chassis rigidity (sport chassis increases chassis rigidity by 3%, race chassis increases chassis rigidity by 6%), i.e. ARBs should be reduced accordingly.

Car Property                       Change                  Effect on ARBs

Weight                                   Increase                       Increase

Weight                                   Decrease                     Decrease

Power                                     Increase                      Increase 

Chassis Reinforcem.              Street                             None

Chassis Reinforcem.               Sport                        Decrease1

Chassis Reinforcem.               Race                         Decrease2 

Reduce ARB stiffness by 3%

2 Reduce ARB stiffness by 6%

Springs

Springs control the weight transition during directional changes and between front and rear wheels during acceleration and braking. Softer springs provide more grip but can lead to sluggish car behaviour during directional changes or locking front wheels under braking and when setup too soft. Stiffer springs provide more control but can lead to harsh unpredictable car behaviour during directional changes or wheel spin when accelerating when setup too stiff.

Spring rates need to be setup in relation to car weight, weight distribution and chassis / suspension stiffness. More weight requires stiffer springs and more flexible chassis / suspension require higher spring rates on the non driven wheels (front for RWD) and lower spring rates on driven wheels (rear for RWD).

Distribution of front and rear spring rates is related to weight distribution, so cars with more front weight will require also higher front spring rates. As with ARBs this is not a simple 1:1 distribution according to weight distribution as for instance the drive wheels are usually run with lower springs rates in relation to non driven wheels to reduce wheel spin. 

As others suggested a good range is between 1/3 and 1/2 of the slider though there are exceptions where you need to run above or below that range.

These are the ranges for spring rates I usually operate (given in percentage of distributed front / rear weight) on RWD cars:

Car Type                          Front Spring Rate           Rear Spring Rate

                                                            (Race Suspension)

Utility Car                                 93-100%                             57-80%

Street Car                                 93-100%                             57-80%

Sports Car                                87-98%                               58-80%

High Performance Car           85-93%                               63-84%

------------------------------------------------------------------------------------------------

Race Car                                    83-93%                               59-85%

Race Truck                                   80%                                    90%

Prototype Race Car                 79-83%                               70-89%

GP Race Car                                66%                                    79%

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Rally Sports Car                        87-94%                              60-80%

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Off-road Buggy                        94-100%                             57-80%

Off-road Car                             94-100%                             57-80%

Off-road Sports Car                 94-100%                             57-80%

Off-road Truck                          94-100%                             57-80%

Off-road Race Truck                94-100%                             57-80%

The ranges given account for different body types within the car type.

Example: RWD road car with 3000lbs @ 52% wd 

front springs would be between: 

3000 / 2 * 52% * 86% = 670 and 

3000 / 2 * 52% * 100% = 780  depending on body type.

For FWD cars simply swap front and rear spring rates. For AWD cars use RWD rear spring rate for front springs and add 0.05-0.9% offset for rear spring rate depending on body type. Older cars require higher offset than modern cars and race cars require a lower offset than productions cars.

For rally suspension simply use half of the springs rates as compared to race suspension since rally suspension provides exactly half of the spring rate ranges as race suspension.

For cars with off-road suspension (these are all off-road cars with a stock adjustable suspension) suspension tuning works a little bit different than for race or rally suspension. Instead of using front and rear spring rates that are related to front and rear weight, front and rear springs must be related to available front and rear spring ranges. So a front spring rate of 39% means front springs must be set to 39% of the available front spring range with 0% would be the minimum allowed front spring rate and 100% the maximum allowed front spring rate.

The available front and rear spring range can be calculated by multiplying the cars weight with the (car specific) minimum and maximum front and rear spring rates.

Car Type                          Front Spring Rate           Rear Spring Rate

                                                         (Off-road Suspension)

Off-road Buggy                          39-40%                                6-7%

Off-road Car                               39-40%                                6-7%

Off-road Sports Car                   39-40%                                6-7%

Off-road Truck                           39-40%                                 6-7%

Open Wheel Off-road Car        39-40%                                6-7%

Off-road Race Truck                  38-39%                                6-7%

 

The ranges given account for different body types within the car type.

Example: RWD off-road buggy with stock adjustable suspension, 2200lbs, front springs min/max: 77.8/142.6, rear springs min/max: 95.1/142.6  

front springs would be between: 

77.8 + (142.6-77.8) * 39% = 103.1 and 

77.8 + (142.6-77.8) * 40% = 103.7 depending on body type.

AWD and FWD Cars

For AWD cars use the same spring rates as RWD cars. for FWD cars simply swap front and rear spring rates.

Relevant Car Upgrades

Changing suspension requires to adjust spring rates, when upgrading from race to rally suspension spring rates need to be halved, likewise when upgrading from rally suspension to race suspension spring rates need to be doubled.

Adding chassis reinforcement upgrade increases chassis rigidity, i.e. springs should be reduced accordingly.

Increasing tire width also requires springs to be increased to compensate for added grip. For each 10 mm increase in tire width increase springs by 0.5%. This is usually in the range of 0-5lb depending on increased tire width.

Also when adding aero springs need to be increased to compensate for added downforce. However the exact impact of downforce on springs is not simple to determine as it not only involves the amount of added downforce but must also take into account the deviation of downforce from balanced downforce level.

Car Property                 Change                 Effect on Springs

Weight                             Increase                       Increase

Weight                            Decrease                      Decrease

Suspension                 Rally -> Race              Double springs

Suspension                 Race -> Rally                Halve springs

Front Tire Width            Increase              Increase front springs

Front Tire Width           Decrease             Decrease front springs

Rear Tire Width              Increase              Increase rear springs

Rear Tire Width             Decrease             Decrease rear springs

Front Downforce           Increase              Increase front springs

Front Downforce           Decrease            Decrease front springs

Rear Downforce             Increase              Increase rear springs

Rear Downforce             Decrease            Decrease rear springs

Chassis Reinforcem.        Street                            None

Chassis Reinforcem.        Sport                Decrease front springs1

Chassis Reinforcem.         Race                Decrease front springs2

Reduce front spring rate by 2.75%

Reduce front spring rate by 5.5%

Balanced Downforce

Balanced downforce levels depend on the cars weight distribution and are distributed around the cars aerodynamic ideal front weight distribution of 47%. For a car with 47% front weight distribution and a Standard Forza race aero kit (100-220/220-441) balanced downforce is achieved e.g. when both downforce sliders are set to minimum values (110/220) . The higher you go the more rear downforce is required to achieve balanced downforce, e.g. 165/358 or 198/441. For cars with higher front weight distribution rear downforce slider must be higher than front downforce slider depending on how much the cars front weight distribution differs from 47%. Likewise for cars with lower front weight distribution rear downforce slider must be lower than front downforce slider to achieve balanced downforce levels. For each %1 difference of car weight distribution from 47% rear downforce must be increased or decreased by 1.866667lb.  So balanced downforce levels kind of equalize the deviation of the cars front weight distribution from the ideal 47% front weight distribution by increasing or decreasing rear downforce in relation to front downforce.

 

Usually balanced downforce only affects rear downforce but if balanced aero would require to increase rear downforce beyond maximum possible rear downforce, rear downforce is set to maximum and front aero is reduced instead. Likewise if balanced downforce would require to reduce rear downforce lower than minimum allowed front downforce, rear downforce is set to minimum and front downforce is increased instead.

Example: FWD production car with 64% wd, Standard Forza aerokit (50-100/75-200):

Balanced rear downforce for 75lb front downforce:

137 + (64-47) * 1.866667 = 168.7339 --> 169lb

Aero Kit                            Downforce

Stock Front Bumper1             10lb

Street Front Bumper             10lb

Sport Front Bumper              40lb

Stock Rear Wing2                   25lb

Street Rear Wing                    25lb

Sport Rear Wing                     70lb

Stock Rear Bumper1              25lb

Street Rear Bumper               25lb

Sport Rear Bumper                50lb       

 

1 Some off-road cars and trucks don't have stock bumpers, so in this case there is no downforce applied

2 Many cars don't have a stock rear wing, so in this case there is no downforce applied

To sum up the impact of downforce on springs consist of two factors:

  • amount of added downforce: for each 10lb added front downforce increase front springs by 0.5, for each 25lb added rear downforce increase rear springs by 0.5

  • deviation from balanced downforce: for each 2lb difference of front / rear downforce from balanced front / rear downforce increase or decrease front / rear springs by 0.5

Keep in mind that not only adjustable race aero kits provide downforce that has an impact on springs but also non-adjustable stock, street or sports aero kits, albeit much more subtle.

Example: FWD road car with 2198lb, 64% wd, stock aero (10/25/25), front springs: 563.9, rear springs 370.9

Adding front and rear race aero kit with stock downforce 75/137 (balanced downforce for 64% wd is 75/169)

Front spring offset: (75-10)/10=6.5, 6.5*0.5=3.25

Rear spring offset: (137-25)/25=4.48, 4.48*0.5=2.24,(137-169)/2=-16,-16*0.5=-8, total rear spring offset: 2.24-8=-5.76

New front springs: 563.9 + 3.25 = 567.15

New rear springs: 370.9 - 5.76 = 365.14

Ride Height

Ride height works as an additional stabilizing factor like aero and a higher ride height generally allows you to brake and accelerate faster. However raising ride height also raises the center of mass which hurts turning. So there is a sweet spot for setting up the ride height which I call optimal ride height.

The optimal ride height for a car is the lowest ride height possible that is not lower than the car types minimum ride height. Each car type has a minimum ride height that is required to have enough suspension travel during cornering. 

In general for older cars the minimum ride height is higher than for modern cars and for race cars the minimum ride height is lower than for productions cars.

Always keep front and rear ride height level , i.e. keep the sliders aligned. Having front and rear ride height sliders unaligned  creates over- or understeer effects and is only required when tuning for grip, speed or specific tracks.

Car Type                                 Min. Ride Height

Utility Car                                         5.0-7.0 

Street Car                                         5.0-7.0 

Sports Car                                        5.0-7.0 

Open Wheel Car                             5.0-7.0

High Performance Car                  4.0-5.0

--------------------------------------------------------------------

Race Car                                          4.0-6.0 

Race Truck                                          4.5

Prototype Race Car                        3.5-4.5 

GP Race Car                                        5.5

--------------------------------------------------------------------

Rally Sports Car                                 5.0 

--------------------------------------------------------------------

Off-road Buggy                              5.0-7.0 

Off-road Car                                   5.0-7.0 

Off-road Sports Car                       5.0-7.0 

Off-road Truck                               5.0-7.0 

Off-road Race Truck                      5.0-7.0 

The ranges given are for different body types within the car type.

Note: Minimum ride height works in 0.5 increments and is most of the time an integer number.

Dampers

Getting damping right is one of the hardest parts when it comes to tuning and from my experience separates good tunes from excellent tunes.

 

Dampers control weight transition during directional changes and while turning. Bump helps you in initiating a directional change or entering a turn while rebound helps to maintain the speed while turning.

 

Setting bump too soft can result into corner diving while braking and entering a turn. Also too soft bump can make the car unresponsive to directional changes and provoking oscillation of the front springs making the car very bouncy. Setting bump too stiff can result in understeer while entering a turn. It also can create rear tire spin while accelerating out of a corner.

 

Setting rebound too soft makes the car oversteer on corner entry and generally unresponsive to directional changes. Setting rebound to stiff creates understeer during corner entry and while turning.

Generally damping stiffness must be set in relation to chassis / suspension stiffness, i.e. a car with more rigid chassis / suspension requires higher overall damping stiffness. Damping stiffness is the sum of bump and rebound.

 

Bump has a direct relation to front car weight and suspension stiffness, i.e. the higher the cars front weight is the higher the bump is required to avoid diving on turn-in. Also cars with stiffer suspension require less bump whereas older cars with softer suspension require stiffer bump. 

Rebound has a direct relation to chassis stiffness, the more rigid the chassis is the higher the rebound must be set. 

Rebound should be most of the time higher than Bump. Exception are open wheel cars where rebound and bump are required to be leveled due to the unique suspension geometry of open wheel cars.

Car Type                                 Rebound           Bump

                                                    (Race Suspension)

Utility Car                                  10.0-12.0          5.0-6.0

Street Car                                  10.5-12.5          4.5-5.5

Sports Car                                 10.5-12.5          4.5-5.5

High Performance Car            12.5-16.5          4.5-6.5

---------------------------------------------------------------------------

Race Car                                    14.5-16.0          5.0-6.0

Race Truck                                 18.0-18.5         7.5-8.0                           

Prototype Race Car                  18.0-20.0         6.0-8.0

GP Race Car                               13.0-14.0       15.5-16.5

---------------------------------------------------------------------------

Sports Car                                 10.5-12.5          4.5-5.5

---------------------------------------------------------------------------

Off-road Buggy                         10.0-11.5         4.0-6.0

Off-road Car                              10.0-11.5         4.0-6.0

Off-road Sports Car                  10.0-11.5         4.0-6.0

Off-road Truck                          10.0-11.5          5.5-6.5

Off-road Race Truck                   8.0-10.5         8.0-10.5

The ranges given account for different body types within the car type and weight ranges.

 Changed in Horizon 5  Even though rally or off-road suspensions now offer the same damping range as race suspension (in Horizon 4 they only offered half of the damping range) damping still needs to be scaled down when using rally or off-road suspension as compared to race suspension.

Car Type                                 Rebound           Bump

                                           (Rally / Off-road Suspension)

Utility Car                                   6.5-8.5             1.5-2.5

Street Car                                   7.0-9.0             1.0-2.0

Sports Car                                  7.0-9.0             1.0-2.0

High Performance Car              9.0-9.5            1.5-3.0

---------------------------------------------------------------------------

Race Car                                      7.5-9.0            2.0-3.0

Race Truck                                    10.0               6.0-8.0                           

Prototype Race Car                   7.5-9.5            4.0-6.0

GP Race Car                               6.0-7.0             8.5-9.5

---------------------------------------------------------------------------

Rally Sports Car                        7.0-9.0             1.0-2.0

---------------------------------------------------------------------------

Off-road Buggy                         6.5-8-0             1.5-2.5

Off-road Car                              6.5-8-0             1.5-2.5

Off-road Sports Car                  6.5-8-0             1.5-2.5

Off-road Truck                           6.5-8.0             2.0-3.0

Off-road Race Truck                 4.5-7.0              4.5-7.0

The ranges given account for different body types within the car type and weight ranges.

The relation between front and rear dampers should mirror the relation of front and rear spring rates, i.e. if the front spring rate is lower than the rear spring percentage rate the front dampers should also be lower than the rear dampers and vice versa. 

Front-Rear Spring Rate      Front-Rear Rebound        Front-Rear Bump

Difference                              Difference                          Difference

<1.5%                                                0.2                                         0.1

1.5-35%                                             0.3                                         0.2

36-40%                                              0.6                                         0.4

>40%                                                 1.2                                         0.8

Example: FWD car with front spring rate 50%, rear spring rate is 80%

Spring rate difference: 50%-80% = -30%

Front rebound should be 0.3 lower than rear rebound

Front bump should be 0.2 lower than rear bump

Prototype Race Cars and GP Race Cars 

Prototype race cars and GP race cars require extra high damping due to extreme forces that impact the chassis while cornering. Prototype race cars require higher rear damping while GP race cars require higher front damping for best performance.

                                                    Front Damping Offset     Rear Damping Offset    

Prototype Race Car                                      0.0                                  +3.5

GP Race Car                                                 +3.5                                   0.0

Relevant Car Upgrades

When reducing weight bump might need to be increased and rebound need to be decreased to compensate for added front weight, for every 100lb front weight reduction rebound needs to increased by 0.1 and bump needs to be reduced by 0.1. Similarily when adding front weight, rebound has to be reduced and bump has to be increased.

When adding aero bump might need to be increased and rebound need to be decreased to compensate for added front downforce, this is usually in the range of 0.1-0.3 depending on amount of added downforce.

Car Property                Change                        Effect on Dampers

Front Weight                 Increase                Decrease rebound / Increase bump

Front Weight                Decrease               Increase rebound / Decrease bump

Front Downforce          Increase                Decrease rebound / Increase bump

Front Downforce         Decrease               Increase rebound / Decrease bump

Brakes

Brake tuning in Forza depends on the type of car and the type of drivetrain. Generally speaking race cars require more braking force on the rear and higher brake pressure than road cars and off-road and rally cars require more braking force on the front  than road cars. 

Also heavier cars like trucks require higher brake pressure than lighter cars like buggies.

Car Type                          Brake Distribution        Brake Pressure

                                                            (Race Suspension) 

Utility Car                                      50%                                120%    

Street Car                                      52%                                125%    

Sports Car                                     52%                                125%    

High Performance Car                54%                                135%

---------------------------------------------------------------------------------------------

Race Car                                        56%                                145%

Race Truck                                    56%                                145%

Prototype Race Car                     56%                                145%

GP Race Car                                  52%                                125%

---------------------------------------------------------------------------------------------

Rally Sports Car                            48%                                125%    

---------------------------------------------------------------------------------------------

Off-road Buggy                            46%                                110%

Off-road Car                                 48%                                115%

Off-road Sports Car                     48%                                115%

Off-road Truck                             52%                                 135%

Off-road Race Truck                    52%                                 135%

 Rally or off-road suspension generally require more braking force on the front as compared to race suspension.

Car Type                          Brake Distribution        Brake Pressure

                                                     (Rally / Off-road Suspension) 

Utility Car                                      50%                                120%    

Street Car                                      48%                                125%    

Sports Car                                     48%                                125%    

High Performance Car                50%                                135%

---------------------------------------------------------------------------------------------

Race Car                                        52%                                145%

Race Truck                                    52%                                145%

Prototype Race Car                     52%                                145%

GP Race Car                                  48%                                125%

---------------------------------------------------------------------------------------------

Rally Sports Car                            48%                                125%    

---------------------------------------------------------------------------------------------

Off-road Buggy                            46%                                110%

Off-road Car                                 48%                                115%

Off-road Sports Car                    48%                                115%

Off-road Truck                             52%                                135%

Off-road Race Truck                    52%                                135%

Differential

Differential is for fine tuning corner entry and exit behaviour. Also a good ratio between accel and decel supports smooth cornering without unnecessary corrections.

 

Generally older cars require lower accel and higher decel than modern cars and race cars require higher accel and lower decel than road cars. Also off-road cars require lower differential settings than road cars.

 New in Horizon 5  Differential tuning now also depends if a race, rally or off-road differential is installed. The new rally and off-road differentials offer better turning capabilities on dirt and off-road tracks and generally require a higher accel and a lower decel tuning than race differentials. The also new available drift differential is similar to a race differential but it designed to improve drifting as compared to race differential.

 

RWD Cars

 Changed in Horizon 5  Generally Horizon 5 uses a lower differential tuning as Horizon 4. 28/45 is now good middle ground for modern road, sports and rally cars, increase accel and/or decrease decel for cars with more rigid chassis/suspension (i.e. super cars, GT race cars etc.), decrease accel and/or increase decel for cars with more flexible chasssis/suspension (i.e. older cars).

 Changed in Horizon 5  0/15 is good middle ground for modern off-road cars, decrease accel and/or increase decel for older off-road cars with more flexible chasssis/suspension.

 Changed in Horizon 5  52/0 is good middle ground for modern prototype race cars, decrease accel or older prototype race cars.

 Changed in Horizon 5  2/0 is good middle ground for classic GP race cars

 Changed in Horizon 5  What also have been changed is that generally accel tuning only works good in 2% increments so make sure that the accel is always an even number. This is now inline with how Forza 7 treats differential accel tuning.

Car Type                                Accel               Decel

                                        (Race Suspension & Race Diff)

Utility Car                               24-28%            45-46%      

Street Car                               24-28%            45-46%      

Sports Car                              24-28%            45-46%      

High Performance Car           28%                  44%         

-----------------------------------------------------------------------

Race Car                                 28-30%            43-44%      

Race Truck                                30%                  44%         

Prototype Race Car               52-54%                 0%        

GP Race Car                               2%                     0%        

-----------------------------------------------------------------------

Rally Sports Car                         0%                14-15%        

-----------------------------------------------------------------------

Off-road Buggy                          0%                   0%   

Off-road Car                               0%                15-16%    

Off-road Sports Car                   0%                15-16%    

Off-road Truck                            0%                15-16%     

Off-road Race Truck                   0%                  0%      

The ranges given account for different body types within the car type.

Rally or off-road suspension generally require 10% lower diff settings as compared to race suspension.

Car Type                                Accel               Decel

                              (Rally / Off-road Suspension & Race Diff)

Utility Car                               14-18%            35-36% 

Street Car                               14-18%            35-36% 

Sports Car                              14-18%            35-36% 

High Performance Car           18%                  34%    

-----------------------------------------------------------------------

Race Car                                 18-20%            33-34% 

Race Truck                                20%                  34%   

Prototype Race Car               42-44%               0%    

GP Race Car                               0%                    0%   

-----------------------------------------------------------------------

Rally Sports Car                        0%                    4-5%   

-----------------------------------------------------------------------

Off-road Buggy                          0%                    0% 

Off-road Car                               0%                  5-6%    

Off-road Sports Car                   0%                  5-6%   

Off-road Truck                            0%                  5-6%   

Off-road Race Truck                   0%                   0%  

The ranges given account for different body types within the car type.

 New in Horizon 5  Rally and Off-road Differentials

Rally and off-road differentials require higher accel and lower decel tuning as compared to race differentials for improved turning on dirt or off-road tracks.

                                              Accel Offset        Decel Offset

Rally Differential                      +24%                     -20%

Off-road Differential                +48%                    -40%

Open Wheel Cars

Open wheel cars generally require a more open (=lower) diff than regular closed wheel cars to combat inherent understeer due to car design.

                                                            Accel Offset          Decel Offset

Open Wheel Car                                     -24%                      set to 0%

FWD Cars

For FWD cars use the RWD diff settings as basis and set them according to following scheme:

Front Accel:  RWD Accel - 20%

Front Decel:       0%

AWD Cars

For AWD cars use the RWD diff settings as basis and set them according to following scheme:

Front Accel:  RWD Accel 

Front Decel:       0%

Rear Accel:      100%

Rear Decel: RWD Decel

 Changed in Horizon 5  Diff Distr.: In Horizon 5 differential distribution depends on the installed differential:

     Race Diff: RWD Accel + 50% (2% + 48%),

     Rally Diff: RWD Accel + 26% (2% + 24%)

     Offroad Diff: RWD Accel + 14% (2% + 12%)

 Changed in Horizon 5  AWD Drivetrain Swaps

 

Cars with an AWD drivetrain swap are now automatically equipped with a stock rally differential, tune it accordingly (see above).

Gearing

For general road tuning only adjustment of the final drive is required. Tuning single gears ratios is only required when tuning for specific seasons or weather conditions.

Setting up the final drive depends on the cars power, the type of installed gearbox, installed aero kits and installed differential ( New in Horizon 5 ). The general logic here is a car with more power requires a lower final drive and vice versa.

There are two types of gearboxes, Standard race gearboxes and custom race gearboxes:

  •  Changed in Horizon 5  Standard Forza race gearbox with following gear ratios: 4.14/2.67/1.82/1.33/1.00/0.80

  •  New in Horizon 5  Standard Forza 6-speed race gearbox with following gear ratios: 4.15/2.69/1.90/1.42/1.12/0.95/0.80

  •  New in Horizon 5  Standard Forza 7-speed race gearbox with following gear ratios: 4.15/2.69/1.90/1.42/1.12/0.95/0.80

  •  New in Horizon 5  Standard Forza 8-speed race gearbox with following gear ratios: 4.17/2.95/2.20/1.71/1.38/1.17/1.02/0.90

  •  New in Horizon 5  Standard Forza 9-speed race gearbox with following gear ratios: 4.17/2.90/2.15/1.66/1.34/1.13/0.98/0.86/0.77

  •  New in Horizon 5  Standard Forza 10-speed race gearbox with following gear ratios: 4.17/2.73/1.94/1.49/1.21/1.04/0.92/0.84/0.78/0.72

  •  New in Horizon 5  Standard Forza 4-speed drift gearbox with following gear ratios: 2.89/1.99/1.34/1.00

  • Custom race gear box (any other race gearbox)

 New in Horizon 5  When performing drivetrain swaps the car is now automatically equipped with a Standard 6-speed race gearbox. However this 6-speed race gearbox uses higher gear ratios than the normal Standard Forza race gearbox.  Also the Standard  7-, 8-, 9- or 10-speed gearboxes uses different gear ratios than their normal variants when the car has a drivetrain swap. This gives another set of Standard Forza race gearboxes for drivetrain swaps:

  • Standard Forza RWD drivetrain swap stock 6-speed race gearbox with following gear ratios: 4.17/2.55/1.70/1.24/1.10/0.90

  • Standard Forza AWD drivetrain swap stock 6-speed race gearbox with following gear ratios: 4.15/3.01/2.31/1.82/1.47/1.24

  • Standard Forza drivetrain swap 6-speed race gearbox with following gear ratios: 4.14/2.67/1.82/1.33/1.00/0.80

  • Standard Forza drivetrain swap 7-speed race gearbox with following gear ratios: 4.15/2.69/1.90/1.42/1.12/0.95/0.80

  • Standard Forza drivetrain swap 8-speed race gearbox with following gear ratios: 4.17/2.95/2.20/1.71/1.38/1.17/1.02/0.90

  • Standard Forza drivetrain swap 9-speed race gearbox with following gear ratios: 4.17/2.90/2.15/1.66/1.34/1.13/0.98/0.86/0.77

  • Standard Forza drivetrain swap 10-speed race gearbox with following gear ratios: 4.17/2.73/1.94/1.49/1.21/1.04/0.92/0.84/0.78/0.72

  • Standard Forza RWD drivetrain swap 4-speed drift gearbox with following gear ratios: 2.89/1.99/1.35/1.00

  • Standard Forza AWD drivetrain swap 4-speed drift gearbox with following gear ratios: 2.89/1.99/1.34/1.00

The general principle here is that the installed gearbox is calibrated to the cars stock power and stock aero. If the car uses a standard Forza race gearbox, the gearing is scaled to a reference car with a stock power of 400hp with race front bumper and race rear wing equipped. If the car uses a standard Forza sp gearbox, the gearing is scaled to a reference car with a stock power of 400hp with sport front bumper and sport rear wing equipped.

 

If the car uses a custom gearbox the gearing is scaled to the cars stock power and stock aero.

Being calibrated means the cars stock gearing is already optimal for the cars stock power and stock aero. You only have to change the final drive if you change the cars power via engine upgrades or change the overall downforce profile by installing aero kits. For each 6hp increase over stock power you need to decrease the final drive by 0.01. Likewise for each 6hp decrease over stock power you need to increase the final drive by 0.01

Cars with Standard Forza race gearbox and 6-speed sport gearbox

For cars with a standard Forza race gearbox and a 6-speed sport gearbox both race and sport gearbox are scaled to a reference final drive of 4.25.

To get the required final drive subtract the cars power from 400hp (the reference cars stock power), divide it by 6hp, multiply it by 0.01 and add it to 4.25 (the reference final drive).

Example: Car with 325hp, stock final drive 4.21
400hp-325hp=75hp
75hp/6hp=12.5

12.5*0.01=0.125
4.25+0.125=4.375 --> Final Drive: 4.38

For cars with Standard Forza race gearbox that are not equipped with a race front bumper and race rear wing the final drive needs further to be reduced depending on installed aero kits to compensate for reduced downforce and therefore increased top speed:

Front Bumper                      Rear Wing                 Final Drive Offset

Race                                        Race                                    0.00

Sport                                       Race                                    -0.05

Street                                      Race                                    -0.05

Stock1                                     Race                                    -0.05

Removed                                Race                                    -0.05

Race                                        Sport                                   -0.05

Race                                        Street                                  -0.05

Race                                        Stock2                                 -0.05

Race                                        Removed                            -0.05

Sport                                       Sport                                   -0.10

Street                                      Sport                                   -0.15

Stock1                                     Sport                                   -0.15

Removed                                Sport                                   -0.15

Sport                                       Street                                  -0.15

Sport                                       Stock2                                  -0.15

Sport                                       Removed                            -0.15

Street                                      Street                                  -0.20

Stock1                                     Street                                  -0.25

Removed                                Street                                  -0.25

Street                                      Stock2                                 -0.25

Street                                      Removed                            -0.25

Stock1                                     Stock2                                  -0.30

Removed                                Stock2                                  -0.35

Stock1                                     Removed                             -0.35

Removed                                Removed                             -0.40

1 For off-road cars and some classic cars that are not equipped with a stock front bumper use Removed instead of Stock

2 For off-road cars and cars are not equipped a with a stock rear wing use Removed instead of Stock

Likewise for cars with a Standard Forza sport gearbox that are not equipped with a sport front bumper and sport rear wing the final drive needs further to be increased/reduced depending on installed aero kits:

Front Bumper                      Rear Wing                 Final Drive Offset

Race                                        Race                                     0.10

Sport                                       Race                                     0.05

Street                                      Race                                     0.05

Stock1                                     Race                                     0.05

Removed                                Race                                     0.05

Race                                        Sport                                    0.05

Race                                        Street                                   0.05

Race                                        Stock2                                  0.05

Race                                        Removed                             0.05

Sport                                      Sport                                    0.00

Street                                      Sport                                   -0.05

Stock1                                     Sport                                   -0.05

Removed                                Sport                                   -0.05

Sport                                       Street                                  -0.05

Sport                                       Stock2                                  -0.05

Sport                                       Removed                            -0.05

Street                                      Street                                  -0.20

Stock1                                     Street                                  -0.25

Removed                                Street                                  -0.25

Street                                      Stock2                                 -0.25

Street                                      Removed                            -0.25

Stock1                                     Stock2                                  -0.30

Removed                                Stock2                                  -0.35

Stock1                                     Removed                             -0.35

Removed                                Removed                             -0.30

1 For off-road cars and some classic cars that are not equipped with a stock front bumper use Removed instead of Stock

2 For off-road cars and cars that are not equipped a with a stock rear wing use Removed instead of Stock

For cars that are equipped with off-road, rally, off-road race, vintage rally tires the race gearbox is calibrated  to a reference car with a stock power of 400hp with sport front bumper and sport rear wing equipped. This means the Final Drive Offset needs to be increased by 0.10 as compared to road tires.

Cars with Standard Forza race gearbox and 5-speed sport gearbox

 

Cars with a Standard Forza race gearbox and a 5-speed sport gearbox the sport gearbox is scaled to a reference final drive of 4.00.

Cars with Standard Forza race gearbox and 3- or 4-speed sport gearbox

 

Cars with a Standard Forza race gearbox and a 3- or 4-speed sport gearbox use a higher reference final drive for sport transmission.

For cars with a Standard Forza race gearbox and a 4-speed sport gearbox the sport gearbox is scaled to a reference final drive of 4.75.

For cars with a Standard Forza race gearbox and a 3-speed sport gearbox the sport gearbox is scaled to a reference final drive of 4.50.

Low Gearing Cars with Standard Forza race gearbox

 Changed in Horizon 5  There are some cars (like the 1953 Chevrolet Corvette) which require a lower gearing than usual. These are all cars with a standard Forza race gearbox and a stock final drive <= 3.25. 

 

For low gearing cars the race gearbox is scaled to a reference final drive of 3.25.

For low gearing cars with a 6-speed sport gearbox the sport gearbox is scaled to a reference final drive of 3.25.

For low gearing cars with a 5-speed sport gearbox the sport gearbox is scaled to a reference final drive of 3.00.

For low gearing cars with a 4-speed sport gearbox the sport gearbox is scaled to a reference final drive of 3.75.

For low gearing cars with a 3-speed sport gearbox the sport gearbox is scaled to a reference final drive of 3.50.

High Power Cars with Standard Forza race gearbox

Cars with a Standard Forza race gearbox and very high power (>=800hp) that would potentially exceed the available final drive range simply require to half the cars power and do the above calculation.

 

Low Power Cars with Standard Forza race gearbox

Cars with a Standard Forza race gearbox and very low power (<=200hp) that would potentially exceed the available final drive range simply require to double the cars power and do the above calculation. 

 Changed in Horizon 5  Cars with Drivetrain Swaps

Cars with an AWD or RWD drivetrain swap are now automatically equipped with a Standard 6-speed race gearbox. This gearbox however uses shorter gearing than the Standard Forza race gearbox. Also when upgrading the transmission to 6-speed (only for RWD swaps), 7-speed, 8-speed, 9-speed or 10-speed race transmission the car is equipped with different gearing variants than the normal 6-speed, 7-speed, 8-speed, 9-speed or 10-speed race gearboxes.

Drivetrain swap gearboxes require different final drive tuning depending if an AWD or RWD drivetrain swap has been performed. AWD drivetrain swap gearboxes are for high accel rally racing and require lower final drive tuning while RWD drivetrain swap gearboxes are for high speed off-road racing and require higher final drive tuning than the Standard Forza race gearbox.

                                 Final Drive Offset          Final Drive Offset         

                                      AWD Swap                         RWD Swap

Stock                                 -1.5                                       +1.0                  

6-speed                            ------                                      +1.0                               

7-speed                             -1.5                                        0.0     

8-speed                             -1.5                                        0.0        

9-speed                             -1.5                                        0.0   

10-speed                           -1.5                                        0.0  

4-speed                             -1.5                                        0.0  

Cars with Custom Gearbox


For cars with a custom race gearbox the gearbox is scaled to the cars stock final drive and stock aero.

To get the required final drive subtract the cars power from the cars stock power, divide it by 6hp, multiply it by 0.01 and add it to the cars stock final drive.

Example: Car with 325hp, stock power 300hp, stock final drive 3.30
300hp-325hp=-25hp
-25hp/600=-0.04166667
3.30-0.04166667=3.25833333 --> Final Drive: 3.26

For cars with a custom race gearbox that have aero upgrades installed  the final drive need to further be decreased depending on installed aero kits to compensate for increased downforce and therefore reduced top speed:

Front Bumper                      Rear Wing                 Final Drive Offset

Race                                        Race                                     0.30

Sport                                       Race                                     0.25

Street                                      Race                                     0.25

Stock1                                     Race                                     0.25

Removed                                Race                                     0.25

Race                                        Sport                                    0.25

Race                                        Street                                   0.25

Race                                        Stock2                                  0.25

Race                                        Removed                             0.25

Sport                                       Sport                                    0.20

Street                                      Sport                                    0.15

Stock1                                     Sport                                    0.15

Removed                                Sport                                    0.15

Sport                                       Street                                   0.15

Sport                                       Stock2                                  0.15

Sport                                       Removed                             0.15

Street                                      Street                                   0.10

Stock1                                     Street                                   0.05

Removed                                Street                                   0.05

Street                                      Stock2                                  0.05

Street                                      Removed                             0.05

Stock                                      Stock2                                 0.00

Removed                                Stock2                                 -0.05

Stock1                                     Removed                            -0.05

Removed                                Removed                            -0.10

1 Many off-road cars and some classic cars are not equipped with a stock front bumper, in this case use Removed instead of Stock

2 Many cars are not equipped a with a stock rear wing, in this case use Removed instead of Stock

 New in Horizon 5  Cars with Off-road, Drift or Drag Chassis

Cars that are equipped with off-road, rally, off-road race, vintage rally, drift or drag tires require additional final drive adjustments.

Generally drag and off-road chassis require slightly higher final drive tuning while drift chassis require slightly lower final drive tuning for best performance.

Chassis            Final Drive Offset  

Drag                                -0.2 

Off-road                          -0.1

Drift                                 +0.1 

 Changed in Horizon 5  Rally and Off-road Cars with Standard Forza Gearbox 

Rally and off-road cars with a Standard Forza gearbox (see above) generally require higher final drive tuning than road cars for best performance. For rally cars the reference final drive is 4.75 whereas for off-road cars the reference final drive is 5.00.

 

That means for rally cars final drive must be  increased by 0.5 and for off-road cars final drive must be increased by 0.75 compared to road cars.

                                       Final Drive Offset               

Rally Car                                   +0.50

Off-road Car                            +0.75              

 Changed in Horizon 5  Rally Cars with Custom Gearbox 

There are two types of custom gearboxes that Rally cars use: either they use a custom race gearbox where gear ratios are tuned for really racing which means they are shorter for normal road racing. Some rally cars even use dedicated rally gearboxes (see below), that have final drive and gear ratios tuned for rally racing, which means both final and gear ratios are shorter.

For rally cars with custom gearboxes gear ratios need to be decreased for best performance for road racing.

                                   Gear Ratio Offset

Rally Car                             -0.20

 Changed in Horizon 5  Rally Cars with Rally Gearbox 

Some rally cars have dedicated stock rally gearboxes, that have final drive and gear ratios tuned for rally racing, which means both final and gear ratios are shorter.

Rally gearboxes require to decrease both final and gear ratios for best performance for road racing.

                                   Final Drive Offset           Gear Ratio Offset

Rally Car                                -0.5                                   -0.20

 Changed in Horizon 5  Low Gearing Rally Cars with Rally Gearbox 

There are also rally cars that are equipped with a lower gearing stock rally gearbox, these are all rally gearboxes with a stock final final drive <= 3.50. Low gearing rally gearboxes actually require to increase final drive for road racing and keep stock gear ratios.

                                   Final Drive Offset           

Rally Car                                +0.5                       

 Changed in Horizon 5  Off-road Cars with Custom Gearbox 

There are two types of custom gearboxes that Offroad cars use: either they use a custom race gearbox where gear ratios are tuned for offroad racing which means they are longer than for normal road racing. Some offroad cars even use dedicated offroad gearboxes (see below), that have final drive and gear ratios tuned for offroad racing, which means final and gear ratios are shorter.

For off-road cars with custom gearboxes gear ratios need to be increased for best performance for road racing.

                                   Gear Ratio Offset

Offroad Cars                      +0.20

 Changed in Horizon 5  Off-road Cars with Off-road Gearbox 

Some offroad cars even use dedicated stock off-road gearboxes, that have final drive and gear ratios tuned for off-road racing, which means final and gear ratios are shorter.

Off-road gearboxes require to decrease final drive and gear ratios for best performance for road racing.

                                   Final Drive Offset           Gear Ratio Offset

Offroad Cars                          -1.0                                  -0.20

Relevant Car Upgrades

Increasing or decreasing power via engine upgrades requires to adjust final drive to adjust the gearbox to the changed power band.

Also when performing a drivetrain swap as well as change transmission, differential and front bumper or rear wing requires to adjust the final drive cars (see above). 

Car Property                 Change                    Effect on Final Drive

Power                              Increase                             Decrease

Power                             Decrease                             Increase

Drivetrain                 Drivetrain Swap               Increase/Decrease

Transmission                   Change                      Increase/Decrease

Differential                       Change                      Increase/Decrease1   

Tire Compound               Change                      Increase/Decrease2 

Front Bumper                  Change                      Increase/Decrease   

Rear Wing                         Change                      Increase/Decrease   

1 only for road cars

2 only when changing cars chassis type

Aero

Aero tuning in Horizon is relatively easy as it depends only on the drivetrain and the cars power.

 Changed in Horizon 5  As opposed to Horizon 4 there are no Standard race aero kits anymore, i.e. for each car there is a unique custom race aerokit available that offers an adjustable front and rear downforce range specific to that car. 

 Changed in Horizon 5  The general pattern on how to setup aero depending on installed drivetrain is relatively easy:

  • RWD: front min / rear max

  • FWD / AWD: front max / rear min

Low Power Cars

 Changed in Horizon 5  Cars with low power (<400 hp) require an 15% reduced rear downforce for best performance:

  • RWD: front min  / rear max * 0.85

  • FWD / AWD: front max / rear min

High Power Cars

 Changed in Horizon 5  Cars with very high power (>=400 hp and >= 1.5*stock power) simply require to increase front or rear downforce by 1.5 for best performance:

  • RWD: front min * 1.5 / rear max

  • FWD / AWD: front max / rear min * 1.5

Extreme Power Cars

 Changed in Horizon 5  Cars with extreme power ((>=400 hp and >= 2*stock power) simply require to double front or rear downforce for best performance:

  • RWD: front min * 2 / rear max

  • FWD / AWD: front max / rear min * 2