Forza 7 Tuning Guide

Part 3 - Grip and Speed Tuning

This section explains how to setup cars in a way that they will work better on grip or speed oriented tracks.

 

Basically this works by altering general tunes as described in part 2 to work better for grip or speed oriented tracks so make sure to first read part 2 how to generally setup cars.

Tuning cars for grip is benefical on grip oriented tracks like Catalunya or Maple Valley that sport many mostly slower turns.  Generally speaking grip tunes require a softer and more oversteer setup.

Tuning cars for speed is benefical on speed oriented tracks like Le Mans or Daytona that sport mostly straights with fewer corners.  Generally speaking speed tunes require a stiffer and more understeer setup.

Tires

Grip tunes require lower tire pressure as compared to general tunes that provides more grip during cornering combined with a slight oversteer setup. Speed tunes on the other hand require higher tire pressure for improved control during cornering and a slight understeer setup.

For grip tunes reduce tire pressure as determined for general tunes in part 2 by 0.5 psi. To achieve a slight oversteer setup increase front tire pressure by 0.5 psi and decrease rear tire pressure by 0.5 psi.

For speed tunes increase tire pressure as determined for general tunes in part 2 by 0.5 psi. To achieve a slight understeer setup decrease front tire pressure by 0.5 psi and increase rear tire pressure by 0.5 psi.

                            Front Tire Pressure         Rear Tire Pressure

Grip Tune                    -0.5 + 0.5                             -0.5 - 0.5

Speed Tune                +0.5 - 0.5                            +0.5 + 0.5

Example: Car with sport tire compound, general tire pressures 28.5/28.5

 

Tire pressures for Grip Tune:

Front Tire Pressure: 28.5 - 0.5 + 0.5 = 28.5

Rear Tire Pressure: 28.5 - 0.5 - 0.5 = 27.5

Tire pressures for Speed Tune:

Front Tire Pressure: 28.5 + 0.5 - 0.5 = 28.5

Rear Tire Pressure: 28.5 + 0.5 + 0.5 = 29.5

Alignment

Grip tunes require a more aggressive, slight oversteer alignment as compared to general tunes for faster cornering. In contrast speed tunes require a more conservative, slight understeer alignment that helps stabilizing the car during cornering.

For grip tunes reduce front and rear camber by 0.1, increase front toe by 0.1, decrease rear by -0.1 and decrease front caster by -0.1 to achieve a more aggressive and oversteer setup.

For speed tunes increase front and rear camber by 0.1, decrease front toe by 0.1, increase rear by -0.1 and increase front caster by -0.1 to achieve a more conservative and understeer setup.

                             Camber       Front Toe      Rear Toe      Caster  

Grip Tune               -0.1                  +0.1                -0.1              -0.1   

Speed Tune           +0.1                  -0.1                +0.1             +0.1

Example: RWD production car with general alignment settings: -2.0/-1.5/0.0/0.0/5.0

Alignment for Grip Tune:

Front Camber: -2.0 - 0.1 = -2.1

Rear Camber: -1.5 - 0.1 = -1.6

Front Toe = 0.0 + 0.1 = 0.1

Rear Toe = 0.0 - 0.1 = -0.1

Caster = 5.0 - 0.1 = 4.9

Alignment for Speed Tune:

Front Camber: -2.0 + 0.1 = -1.9

Rear Camber: -1.5 + 0.1 = -1.4

Front Toe = 0.0 - 0.1 = -0.1

Rear Toe = 0.0 + 0.1 = 0.1

Caster = 5.0 + 0.1 = 5.1

Anti-roll Bars

Grip tunes require a slightly stiffer, more oversteer ARB setup as compared to general tunes for faster cornering and reduced body roll. Speed tunes require a softer, more understeer ARB setup that helps stabilizing the car during cornering,

For grip tunes first increase ARBs by 0.1 to slightly stiffen the ARBs as compared to general tunes.  Then for achieving a slight oversteer reduce front ARB by -0.1 and increase rear ARB by 0.1.

For speed tunes first decrease ARBs by 0.1 to slightly soften the ARBs as compared to general tunes.  Then for achieving a slight understeer increase front ARB by -0.1 and decrease rear ARB by 0.1.

                            Front ARB         Rear ARB

Grip Tune             +0.1 - 0.1          +0.1 + 0.1

Speed Tune          -0.1 + 0.1           -0.1 - 0.1

Example: RWD production car with general ARB settings: 20.5/19.5

ARBs for Grip Tune:

Front ARB: 20.5 + 0.1 - 0.1 = 20.5

Rear ARB: 19.5 + 0.1 + 0.1 = 19.7

ARBs for Speed Tune:

Front ARB: 20.5 - 0.1 + 0.1 = 20.5

Rear ARB: 19.5 - 0.1 - 0.1 = 19.3

Springs

Grip tunes require a slightly softer, more oversteer suspension setup as compared to general tunes for more grip and faster cornering. Speed tunes require a slightly stiffer, more understeer suspension setup for improved control and stabilization of the car during cornering.

For grip tunes first decrease front and rear springs slightly by 0.5 as compared to general tunes. Then for achieving a slight oversteer setup reduce front springs by 0.5 and increase rear springs by 0.5.

For speed tunes first increase front and rear springs slightly by 0.5 as compared to general tunes. Then for achieving a slight understeer setup increase front springs by 0.5 and decrease rear springs by 0.5.

                                 Front Springs         Rear Springs

Grip Tune                    -0.5 - 0.5                  -0.5 + 0.5             

Speed Tune                +0.5 - 0.5                 +0.5 - 0.5

Example: FWD production car with general spring settings: 567.15 / 365.14

Springs for Grip Tune:

Front springs: 567.15 - 0.5 - 0.5 = 565.15

Rear springs: 365.14 - 0.5 + 0.5 = 365.14

Springs for Speed Tune:

Front springs: 567.15 + 0.5 + 0.5 = 568.15

Rear springs: 365.14 + 0.5 - 0.5 = 365.14

Ride Height

Grip tunes require maximum ride height for increased suspension travel while cornering and increased stability during acceleration and braking complemented by a slight oversteer setup. Speed tunes require minimum ride height combined with a slight understeer setup for maximum control and stabilization during cornering.

For grip tunes set front and rear ride height to maximum possible values and then reduce front ride height by -0.1 (usually an oversteer setup would require to increase rear ride height by 0.1 as well but it's already set a maximum).

For speed tunes set front and rear ride height to minimum possible values and then increase rear ride height by 0.1 (usually an oversteer setup would require to decrease front ride height by 0.1 as well but it's already set a minimum).

                               Front Ride Height           Rear Ride Height

Grip Tune               set to max - 0.1                     set to max

Speed Tune            set to min + 0.1                     set to min 

Example: RWD production car with general ride height settings: 4.0 / 5.0, max ride height 5.5/5.8, min ride height 3.8/4.0

Springs for Grip Tune:

Front ride height: 5.5 - 0.1 - 0.1 = 5.4

Rear ride height: 5.8

Ride height for Speed Tune:

Front ride height: 3.8 + 0.1 + 0.1 = 3.9

Rear ride height: 4.0

Dampers

As with springs grip tunes require a slightly softer and more oversteer damper setup for faster cornering as compared to general tunes. Speed tunes require a stiffer and more understeer damper setup for improved control and stabilization during cornering.

For grip tunes first decrease front and rear dampers slightly by 0.1 as compared to general tunes. Then for achieving a slight oversteer setup increase front dampers by 0.1 and decrease rear dampers by 0.1.

For speed tunes first increase front and rear dampers slightly by 0.1 as compared to general tunes. Then for achieving a slight understeer setup decrease front dampers by 0.1 and increase rear dampers by 0.1.

                                 Front Rebound          Rear Rebound           Front Bump        Rear Bump

Grip Tune                     -0.1 - 0.1                       -0.1 + 0.1                    0.1 - 0.1              -0.1 + 0.1

Speed Tune                +0.1 + 0.1                      +0.1 - 0.1                  +0.1 + 0.1             +0.1 - 0.1

Example: RWD production car with general ride damper settings: 7.5 / 7.2 / 4.5 / 4.3

Dampers for Grip Tune:

Front rebound: 7.5 - 0.1 - 0.1 = 7.3

Rear rebound: 7.2 - 0.1 + 0.1 = 7.2

Front bump: 4.5 - 0.1 - 0.1 = 4.3

Rear bump: 4.3 - 0.1 + 0.1 = 4.3

Dampers for Speed Tune:

Front rebound: 7.5 + 0.1 + 0.1 = 7.7

Rear rebound: 7.2 + 0.1 - 0.1 = 7.2

Front bump: 4.5 + 0.1 + 0.1 = 4.7

Rear bump: 4.3 + 0.1 - 0.1 = 4.3

Brakes

Grip tunes require more braking force on the rear and a slight oversteer setup as compared to general tunes for improved braking while turning (trail braking). Speed tunes require more braking force on the front and a slight understeer setup for improved braking and stabilization before corners (straight line braking).

For grip tunes move more braking force to the rear by decreasing front brake distribution by 2% as compared to general tunes and compensate lower braking force on the front by increasing brake pressure by 5%. Then to achieve a slight oversteer setup decrease front brake distribution further by 1% while also increasing brake pressure by 1%.

For speed tunes move more braking force to the front by increasing front brake distribution by 2% as compared to general tunes and compensate higher braking force on the front by decreasing brake pressure by 5%. Then to achieve a slight understeer setup increase front brake distribution further by 1% while also decreasing brake pressure by 1%.

                               Brake Distribution        Brake Pressure

Grip Tune                    -2%  - 1%                       +5% + 1%

Speed Tune                +2% + 1%                        -5%  - 1%

Example: RWD production car with general ride brake settings: 48% / 125%

Brakes for Grip Tune:

Brake distribution: 48% - 2% - 1% = 45%

Brake pressure: 125% + 5% + 1% = 131%

Brakes for Speed Tune:

Brake distribution: 48% + 2% + 1% = 51%

Brake pressure: 125% - 5% - 1% = 119%

Differential

There is no need to adjust differential tuning for grip or speed tunes so simply use the diff settings from general tunes.

Gearing

Grip tunes require shorter gearing as compared to general tunes for improved acceleration and better utilization of the engines powerband that allows to better attack and accelerate out of corners. Speed tunes require longer gearing for higher top speed on the straights.

For grip tunes simply increase the final drive by 0.5 as compared to general tunes. For speed tunes reduce the final drive by 0.5 as compared to general tunes

                                   Final Drive 

Grip Tune                     +0.5

Speed Tune                  -0.5

Example: Car with Standard Forza race gearbox, general gearing settings: final drive 4.38, stock gear ratios

 

Gearing for Grip Tune:

Final Drive: 4.38 + 0.5 = 4.88

Gear ratios:  stock gear ratios

Gearing for Speed Tune:

Final Drive: 4.38 - 0.5 = 3.88

Gear ratios:  stock gear ratios

Aero

Grip tunes require maximum downforce for maximum grip while cornering and improved braking and acceleration. Speed tunes require minimum downforce for maximum top speed on the straights. In fact on most speed tracks you will want to run without aero anyway.

For grip tunes simply set front and rear downforce to maximum available values and for speed tunes set front and rear downforce to minimum values.

 

Don't forget to adjust springs and dampers afterwards to compensate for added or removed downforce as described in general tuning.

                              Front Downforce            Rear Downforce

Grip Tune                 set to max                         set to max

Speed Tune              set to min                          set to min

Example: RWD car with Standard Forza race aero kit, general aero settings 95/195, max 100/200, min 50/75

Downforce for Grip Tune:

Front Downforce = 100

Rear Downforce = 200

Downforce for Speed Tune:

Front Downforce = 50

Rear Downforce = 75