3ds Max Animation :: Animate Car To Follow Circular Path Performing Burnout

I am trying to animate a car to follow a circular path thus performing a burnout.

The problem that I'm having is:

1) when I push the car along the "Y axis" it's good up until the very end of the bend (after the first quarter of the first circle), then it just stops. and when I use the green, blue, red gizmo to get it around the bend, it pretty much skips to the overlapping path so it doesn't actually drive along the path.

2) I can make the back tyres rotate faster than the front tyres, however I'd like to keyframe the tyre rotation so it looks like a proper acceleration and burnout. How do I achieve this? The tyres rotation parameters' are wired up to the percentage of the path constraint of the position of the car rig (which is linked up to follow the path). So if it's possible I'd like to pretty much keyframe in different amounts of rotation ratio with some biezer effect so that the tyres can look like it accelerates into the burnout and then as it comes out of the burnout it gains grip again and goes back to having the same rotation speed as the front tyres. (once I learn how to achieve this to the front tyres then I could essentially apply the same effect to the front ones to make the animation look more realistic.