Started playing with the parameters a bit ... and I've found there's quite a bit of depth. Just by adjusting the horsepower of the car they handle very different. I guess anything could be done, but if I release the engine then I'll probably have a list of ranges for each parameter. Right now the horsepower must be between .006 and .015. Lower than .006 and the car won't budge and higher than .015 and it's sliding too much ... pretty interesting though a .006 the car is slow and just grips the road but upping it to .015 allows it to be loose and fast, sliding through all the turns ... sometimes though being too fast to really take the turn. Anyway, even now there's depth to it so it's possible that a whole sellable engine is in the works with this.