Quote Originally Posted by David88vert View Post
You've never built an engine nor tuned one, that's obvious.

Race gas has higher octane and is used to allow the tuner to run higher compression. You could just install lower compression pistons and tune on lower octane fuel or convert to e85.
lower compression=less power per psi/more lag
So the motor that maxes out on 500whp on pump gas will make more power than the one that can make 600whp on pump gas with the same compression?
hmm

in that case lets all build 1.4l motors and forget swapping bigger more efficient motors