I tried it ans man it is hard to flip now! The only way I could do it was using the ramp, and even then it was hard. Also every time I flipped over the car and pressed enter to respawn it accelerated just fine so maybe that fixed the issue?
Ok, thanks. I'll hope the issue with inability to move is resolved.
Flipping is still easily possible if you try to drive the ramp from the portal back to initial location, but that's a different flipping entirely.