I didn't want to hijack the biggest injectors on pumpgas thread so I have started a new one on a question it raised in my mind... And please remember I'm pretty new to alternative fuel sources go be gentle in your flaming! So if I had a car making 100whp on pump gas (say 92) and I'm running a good tune and have 850 injectors, i was using all they could deliver, would going to E85 make any improvements on the engine performance assuming it was a turbo engine? E85 needs more volume to work so would that therefore limit the output or would the same volume of E85 give me more power with a retune? I understand that with race gas, being a higher rating your adding more active fuel so therefore more potential power (assuming you can take the extra combustion pressures from the need for more air to make the benefit. With E85 alone, would you get reduced performance? Just writing this is making me think I know nothing of the Ron rating for E85, only that you can stuff more in as it runs cooler on combustion.
Your understanding of fuels and their associated octanes is a bit misconstrued. The whole point to E85 is the high octane (113ish, correct me if I'm wrong), thus allowing you to run higher boost, more timing advance, and thus making more power. The penalty for E85 is the lower energy per unit volume, thus needing 25-30% more fuel flow capability. If you want to make the same power on corn, be prepared to have the reserve flow capability. Race gas operates under a similar principle, but has a similar energy content as pump fuel. Race race has a higher knock limit, thus allowing you to run more timing advance and less fuel overall. It does not have a higher energy content. Long story short, if you want to make more power with E85, you need more capability from you fuel system. Race gas lets you get more from the same pump fuel system due to the increased knock resistance.
