You said the scar is very thin, so you might get results from an over the counter product like Scargo, especially if the scar isn’t too old. I’ve used it successfully before.

There are still some variables you haven’t mentioned. How high in the air are you talking, and will the car be dropped, or gently lowered? What kind of terrain is it? A flat, paved surface would be different than a field with rocks and bushes.

I seem to remember a toy car that kids could rev and set down, and it zoomed across the floor very well. A small plastic car isn’t the same as a real one, though.