Tuning N/A 110 octane

CZero

Use xylene if you're going to do that. Toluene is 114 octane while Xylene is 117 octane and they cost nearly the same. If you do mix that in it's a good idea to put in around 3 oz of Marvel Mystery Oil with your toluene/xylene.

I've run a high amount of xylene in both my 06 gti with a apr s3 turbo kit on 100 octane mode and my '86 944 turbo with a t04e 50 trim at 23 psi. It really does work wonders when mixed properly.

They used xylene in F1 back in the day when they could use turbos. They actually ran 86% or so xylene and the rest filler to meet the octane requirements back then.


As far as E85 goes, you could indeed use it to great advantage in a NA car. However, you would need to raise the compression ratio quite high for it to be worth it. I think I've seen 13.5-14:1 C/R with E85 all motor. Otherwise the timing advance, like previously mentioned, just won't be enough. Too advanced of timing doesn't do anyone any good no matter what fuel you're running.