exponential controls the throttle delay, or brake delay, and also steering delay if needed. so basically at 0 its maxed out. putting this at a negative setting will increase the delay. so basically like -5 or -10 on the throttle exponential will delay full throttle, and give a smoother feel on the throttle. this adjusts the throttle curve, so it has a smoother transition and will be less likely to spin the tires on take off and coming out of corners.

do not use ABS, do not use traction control. the throttle and brake exponential are all you need to adjust. and if the rear brakes lock up, decrease the brake endpoint, about 5-10%