Don't think PD went as far as taking body/chassis twist from engine torque into consideration...too many variables, amount of throttle applied, actual engine torque, transversely mounted engines etc.
I noticed that the clio cup car with a warn chassis was faster and easier to drive around trial mountain vs when the chassis had rigidity or rebuilt. Some other in my group also noticed this.
Don't think PD went as far as taking body/chassis twist from engine torque into consideration...too many variables, amount of throttle applied, actual engine torque, transversely mounted engines etc.