So just noticing something while I browse forums and threads, lots of people say (mainly with really high HP setups with FI) they get something like 1100hp on pump gas yet 1600 on racing gas (C16?). Why is there so much of a difference between the two?
Like everyone already stated, more boost, more timing...
I think the thing to note is that now days C16 is being ditched for E85 in a lot of cases. Around me, I haven't heard of anyone doing a "race gas" map any more, everyone just tunes for E85.
to give you an idea of the difference.
Pump gas, I can push to 26 psi. Beyond that, there is too much detonation.
on E85, I can run 33 psi. Take a look at the difference in power that 7 psi, more timing, and running a tad leaner AFRs will get you
Pump gas
E85