This is not the answer to your question but it is almost relevant. Marks Standard Handbook stated that the rule of thumb for trains was that a 100 lb force could accelerate 1 ton of train 1 mph/sec. This figure was including the angular acceleration of the wheels.
You can do a coast down test of your car and figure the force acting on the car. Then again I have not read the whole thread. Maybe you are already that far along.
__________________
usedgeo
|