Originally Posted by Squatchy

Race gas will not gain you any power unless: you turn up boost, increase timing on a knock limited engine, are already experiencing knock, or the fuel is oxygenated. It's possible you might lose a tiny bit of power if the fuel has a slower burn rate and you don't change boost and/or timing. Unless you just like having a little extra safety, it's not worth using race gas unless you're tuned for it.

Originally Posted by smokedmustang

I am just trying to figure something out. If your car is STOCK, or if you are modded and tuned for Pumpgas ONLY, DUMPING any form of racegas in your tank is a total waste of money UNLESS YOU ARE TUNED FOR IT?

I Read somewhere that if you dump racegas in your tank, it is like a "Magic" 40 AWHP gain over pumpgas, even without a tune.

Some people say unless you "tweak this and that", pull timing, lean it out, etc... while running on Racegas, it will ACTUALLY COST you HP, and slow you down. (Not to mention wasting money on it). I was guilty of going to the local dragstrip, and thought If I just dump in this racegas, I am automatically going up in HP, and down on E.T.'s. (back in '03 I thought this) Apparently this is a falsehood? You gain HP on the dyno while on racegas, BECAUSE you are tuning for it and doing the "tweaking" then and there.

So after all that, my question is this:

1. Will racegas alone give you gains in HP, just by dumping it in the tank?
Lets say........in a stock trim car?

I bring this up, as I was at the local dragstrip Friday, and I heard some kids talking about the gains they get JUST by dumping in racegas without tuning for it.

Originally Posted by Ralph

I've datalogged stock EVO's running our crappy 91 octane gas.. each of which had some knock/timing pulled. Mixing a bit of 100/91 will make that car a little faster, as it will no longer have that knock and lower timing advance.. .