Yes I of course checked that tutorial, but even in their example setup I managed to make the car behave a bit strange somehow tongue.
There is actually some thread on the forums, wehere people offer quite some money for some better car code. But I guess that they want physics and mine is for something else anyways.

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com