You could create a single very wide track(like a tank track) and put submesh on it.
You tie the car to one end and when you put the pedal down the track will start rolling.
As for a dyno, my guess is that using tires youll fall through and even if you submesh it, youre going to run into problems. I dont know if its possible to edit the surface of meshes, but if there was a way you could make the dyno rolls from a no friction surface.
I dont think thats possible tho. Personally a simple ramp with two gaps that fit the tires works well(car sitting on a mesh, tires in the air)
Now its time to prove me wrong
