the best way to tune for most races is to not to tune it. but for drags you just ajust the gears so they go like a line from left to right but keep the 1st gear the same and make sure the finale gear is all the way to the right.

4 drag racing it mostly depends on power but, on tires, nos and aeros as well.
4 grip racing put a third of your money on power and nos and a third on traction as well as a third on aeros.
4 speed racing it just depends on power and nos and a little bit of aeros and traction to hold the speed together.
4 drift racing put 3 quarters of power and a quarter of control and aeros and nos.

and if your not very good at tuning setups don't tune it at all.

just dont just spend alot of money on god parts

can have a crew to help like carbon???