Has anyone experimented with racing fuel for their N.A. B-series motors with stock internals? If so, what octane rating did you try? Did you experience any performance benefit? We have the option for 105, 110, and 115 grades. The motor we're going to experiment with has an AFC, Mugen chip, no cat, and the usual breath mods.

Thanks for the information!

 

No need. Race fuel is for HIGH compression engines or turbos basically anything that is in treat of detination.

12:1's run on 92 octane. No need for 105