Why not put in an electric switch that moves a gear so you go from a really low gear setting to a high setting? This way you have both settings. The track car can benefit from this especially in the curves and straight ways.

It also sounds like the engine needs to be tuned a little better so you can get more power for your competitions or you don't give the car gas soon enough to pull you out of the curves.

How is it that you can take 20 NASCAR drivers, put them in 20 cars built Exactly the same (IROC) and get one winner instead of them all coming in at the same time? It's the driver!