Traction Control Improvement

[whitespace-rebel]

Hi everyone,

I'm developing a high torque (660 Nm) RWD sports car, and it is really hard to drive with the keyboard even with traction control on.

The wheels push really hard especially in 3rd and 4th gear.
I looked into the code and realized that wheel slip is fixed at 25%, which is too high for this car.

In source/main/physics/BeamForcesEuler.cpp
you can see this: wheel_slip > 0.25f
It is used once for anti-lock braking and once for the traction control.

My suggestion is to make that 0.25 a variable.
In the .truck file we have the "TractionControl" settings where you can define the wheel slip, but currently it is unused.

Thank you!