Hi everyone,

The Force FeedBack is mainly computed from the Torque Alignment from Physics.
This guide is meant for wheel users on PC that are looking for extra configuration settings.

The Crew Team

Editing

In ‘my Documents\The Crew’ folder, edit or create file ExtraConfig.xml.

Between the <ExtracConfig /> XML tag

add those lines

FFB_Factor="1.5f"
FFB_LoadFactor="1.0f"
FFB_LoadPower="1.5f"
FFB_LatFactor="1.0f"
FFB_SlipAngleFactor="2.0f"
FFB_CamberFactor="0.1f"
FFB_CamberOffset="2.5f"
FFB_DamperFactor="0.2f"
FFB_DamperMaxRoll="1.0f"
FFB_DamperMaxRollVal="0.1f"
FFB_DamperMaxSlipAngle="0.25f"
FFB_WaitRate="5"
FFB_SpringNoControl="0.25f"

If the file was empty it should look like this

<ExtraConfig
FFB_Factor="1.5f"

FFB_LoadFactor="1.0f"
FFB_LoadPower="1.5f"

FFB_LatFactor="1.0f"
FFB_SlipAngleFactor="2.0f"

FFB_CamberFactor="0.1f"
FFB_CamberOffset="2.5f"

FFB_DamperFactor="0.2f"
FFB_DamperMaxRoll="1.0f"
FFB_DamperMaxRollVal="0.1f"
FFB_DamperMaxSlipAngle="0.25f"

FFB_WaitRate="1"
FFB_SpringNoControl="0.25f"
/>

Explanations

FFB is computed from the tire physics, the tire physics compute 4 things,
Lateral Forces
Longitudinal Forces
Vertical Forces
Torque Alignment

The FFB is mainly computed from the Torque Alignment from Physics

Sadly most consumer FFB wheel on the market are not strong enough to have a decent feeling only from this.

That’s why I added extra configuration to “increase” some components of the FFB computation.

There’s 4 components in the FFB :

Tire Load
Tire Slip Angle
Tire Camber
Static Damping

Global Params
You can tune the global gain with
FFB_Factor="1.5f" // default value is 1.5
It’s working exactly like the in game FFB Gain slider

You can configure the refresh rate with
FFB_WaitRate=”1”
Tire physics is refreshed at 300hz, so a rate of 1 will update the FFB at 300hz too, a rate of 2 with refresh at 150hz. etc..
Some FFB driver can’t handle hight refresh rate, if you experience frame rate issue with FFB wheel, increase this value to reduce the Refresh Rate.

U.I. / Cinematics / Map spring effect.
FFB_SpringNoControl="0.25f"
When you don’t have control of the car, a basic spring effect is applied, it’s removed when you drive. You can control the Spring force with this param.

Tire Load Config
Tire load, is how much weight there’s on the tire, the weight of the car is pushing on the tire.
Front Tire load is increasing when the car is braking, when there’s bumps, or compression from the begining of a slope, it’s decreasing when car is accelerating, when there’s holes, and it’s zero when the car is in air.
The more load on the front tire the more stronger is the FFB.

FFB_LoadFactor="1.0f"
FFB_LoadPower="1.5f"

Load Factor is the gain apply to FFB from the Load.
With Load Power you can change the curve of the variation
Pseudo formula

FFBLoad = FrontTireLoad * LoadFactor ^ LoadPower

Load Power may be a bit complicated to undestand, so here to example of curves


Tire Slip Angle
When the car is moving and you turn the steering wheel, you change the front tire angle and so increase the tire slip angle, which create a lateral force , and a tire torque alignment. The more you turn the wheel the stronger the FFB.

FFB_LatFactor="1.0f"
FFB_SlipAngleFactor="2.0f"

LatFactor is the gain of the FFB part from the torque alignement.
SlipAngleFactor is the factor applied to the slip angle for the FFB computation, if you increase this value the FFB will increase faster for smaller slip angle, which will make the FFB feel “tighter”.

Tire Camber
When the car is moving, if the tire lean left or right, the angle with the surface is called the camber, the more camber , the more lateral force and torque alignement and so the stronger the FFB.
Camber is symetrical between the left and right tire, means that if the left tire is leaning to the right, the right tire is leaning to the left Otherwise the car would not drive straight. So on a flat straight line, FFB from camber of left and right tire are cancels each other.
When 1 tire drive on a bump/hole, it’s change the camber on this tire, which create an asymetric value in the torque alignment between left and right tire, which create a force in the FFB.
In summary with this params you can control how much you will feel bumps and holes.

FFB_CamberOffset="2.5f"
FFB_CamberFactor="0.1f"

Camber Offset is to add extra camber to the real value of front tire.
Camber Factor is the gain of this extra camber.

Tire Damper

The whole steering components from tire , steering rack , and steering shaft, have frictions and damping. With this params you can control that.
Damping is a force that acting against the motion on the steering wheel. So if you turn slowly the wheel to the left you will have a slow FFB force to the right, If you turn fast to the left, the FFB will give a stronger force to the right.
There’s 2 damping force, static damping, and rolling damping.

FFB_DamperFactor="0.2f"
FFB_DamperMaxRoll="1.0f"
FFB_DamperMaxRollVal="0.1f"
FFB_DamperMaxSlipAngle="0.25f"

Damper Factor is the gain of this params.

DamperMaxRoll is the max wheel rotatation in rad/s at which the static damping is minimum.
DamperMaxRollVal is the value of the damping when wheel is rolling.

DamperMaxSlipAngle is the slip angle value at wich the damping is zero.

Samples

High Torque Wheels
Default params give too much FFB on dirt because of the bumps.
Here a base for them ( I have a RFR High Torque Custom Wheel 14Nm )

LoadPower is set to 1 to have pure linear FFB
Camber effect is greatly reduced
LatFactor is increased.

<ExtraConfig
FFB_Factor="1.5f"
FFB_LoadFactor="1.0f"
FFB_LoadPower="1.0f"
FFB_CamberFactor="0.1f"
FFB_CamberOffset="0.5f"
FFB_SlipAngleFactor="2.0f"
FFB_LatFactor="2.0f"
FFB_DamperFactor="0.2f"
FFB_DamperMaxRoll="1.0f"
FFB_DamperMaxRollVal="0.1f"
FFB_DamperMaxSlipAngle="0.25f"
FFB_WaitRate="5"
FFB_SpringNoControl="0.25f"
/>