Altough the exponential power curve adding looked to be simple I am still working on it with help from other members here.
What I achieved in the meantime is regenerative breaking.
Normally when you like to break the car to reduce speed dramaticly you have to release the trigger to its zero position so the brake FET is switched on.
If you reduce speed by releasing the trigger the motor will have less internal braking and still carry high speed.
Now when you release the trigger and the speedValue is lower as the previous speedValue the brakes are ON and Speed FET OFF until the speedvalue of the trigger is level or higher again. This way you brake much later and does not have to release the trigger to full brake section. In the end this would save time and lower the lap time.
More to come
Paco