Here are my 'notes' on the C2 car.txt file. The parts written in red will help you out with a few things, like grooves and funks. Note that this is not a tutorial as such, as it doesn't tell you how to do anything, but it does explain how some things work.
VERSION 2
// Generated by CarEd v.1.13 beta
INTERCEPTOR.TXT // Name of Car
0.5 // softness 0.7 is soft(sportscar), 0.2 is tough(truck), 0.0 is a rock(solig granite car)
START OF DRIVABLE STUFF
-0.08,0.179,0 // Offset of driver's head in 3D space
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