[NegroDamus]

Originally Posted by vtecnitrocrx

To those asking about E85, E85's "stoich" ratio is in the high 9:1's versus gasolines 14.7:1 stoich ratio. Since typical FI setups are tuned for 11.5-12:1 for the street, it reveals that you need a fuel system capable of flowing 35% or so more fuel for the same power level. So, while walbro 255's may not be maxed until the 600's hp wise, 475 or so is pushing the pump on E85. You need at least a 660 injector to hit 350whp on E85 as well.

So don't be deceived into believing you can just stick E85 and "hit a button" because you can't. E85 burns alot cooler than gasoline, therefore you'll see alot of variation in ignition timing curves versus standard gasoline. You need to be tuned specifically for E85. E85 has a 105 octane rating though, so you can get some really solid, safe power out of motor running it.

E85 is really a "race gas" for the street in some ways. Only problem is just the shear volume that you'll use, so gas mileage sucks. If you look into the BTU (British Thermal Units) output of gasoline versus E85 (85% Ethanol, 15% gasoline) then you see there is a large variation. It simply takes more E85 fuel to create the same heat energy as gasoline at any given point.

Interesting. I won't bother then, I'll be able to hit my goals on pump gas anyway.