Have your or the kid drove a big dragster? If not, you need to get him with someone at the track that is experienced with slip joints. One wrong move snapping the pedal or hitting the brake too hard and the kid will put that car in a bounce. Too often I see parents without experience bring their child from the junior ranks, stuff them in a car and the kid not realize the power and response that the car will give them. I am not sure what your experiences are but taking it slow is a real good start. With the slip joint the kid needs to learn throttle control and being able to stop the car without getting into the brake pedal too hard.