How to make a vehicle constrain in 2.73?

Hi! I wanted to ask how to make vechicle wrapper constraing in Blender 2.73. Can someone give me a tutorial? I tried this , but it doesn’t appear to be working. Maybe I did something wrong?

OK! I found a tutorial to make it, but now there is another problem. The car setup I have isn’t natural at all. Could you reccomend me any suggestions for realistic car setup in Vehicle Wrapper scripts(CarSetup, Supspension and Powertrain)…

Well, now I took different script and I got problem. The car starts spinning for no reason after I drive a bit. Maybe I must use another script?