This should fix car problem

Hey I know that a lot of people have been having the problem of when the car exceeds a certain limit it starts to jump about everywhere and you loose control of car. I've manage to calm this down by bumping the gravity up to -40, making the cars wheels automatically go back in to place once you have let go on a direct key. I have also added a downforce. All of these things slowly thin out this problem but I have found out that when the cars maxWheelSpeed exceeds the maximum the car starts to slowly turns and spins out. I was wondering if any one could get it so that the car has lets say has max wheel speed of 200 but it cant go over 180 as this would certainly get rid of my problem

Thank you luke