Originally Posted by
Provocateur
You would be able to run more boost or more timing than pump gas. I'd say its very worth it. Do a little research and see what is mods are necessary to make it a reliable, long lasting setup.
You still must remember the energy/volume of fuel is lower.
In theory I can see it only really making a noticeable difference if the engine is rebuilt with E85 in mind. If I were made of money I'd love to test the theory out, but I'm not.
In the end I'd look into building a full-race engine capable of a minimum octane rating of 100 detuned to run on E85 when race gas is not available or as a DD. This of course would allow a higher static compression ratio.
Pretty much I wouldn't be looking to gain much on E85, but rather on the track.