Haha some of you guys kill me. I made 860rwhp with the stuff in my Gt500 with the stock motor and 1000rwhp with the built alum motor. Like the one guy said if you don't have a car that is older than 1985 you have NOTHING to worry about. Everyone needs to stop crying about e85 being a joke and inconsistant, cause it is know where near as inconsistant as 93octane fuel. I NEVER and do mean NEVER check my e85 at the pump and i make 27lbs of boost and 21 degrees of timing. I do make sure when we tune for the first time that we are on pure E85 and then after that i just go to the pump and let her ride. E85 is the best PERIOD pump gas ever made, like it or not and all the political BUllSh!T and its very comparable with the alcohol content of it to being as good as 112-114 octane race fuel. A good friend of mine this weekend is going to run 7's on a out of the pump non tested e85 with a 427 cubed twin 78mm turbo mustang. He has already been 8.18 @ 173 on out of the pump e85. It makes 26lbs of boost and has a air to air I.C. It has made 1384 rwhp on pump E85, and with turbos this is the limit of 160lb injectors on e85, blowers are around 1100rwhp.
The main thing to look at is the injector size and fuel pumps. We have went from 570rwhp with a stock blower,I.w,2.6 blower pulley, headers, intake to 626 just from the switch of E85 and that was only turning it 6300rpms with 22 degrees of timing. Twin screws and roots blower benifit from it even more as it kills any extra intake temp heat and makes the srew blowers more repeatable on the street pull after pull.
A little insight on back to the injectors. 60lbers are only good to 600 at 80psi of fuel pressure on korn. 72 are good till about 700ish, 96 are good till about 750 these are on blower combos not turbos or na. but really anything over 800rwhp should have 120-160lbs injectors. Stock gt500 pumps are only good to 620rwhp with 72lb inj and then you will need dual boost a pumps. Btw the 96lb hp rating was with a Procharger not a crew blower. I don't know how much hp it takes to drive a screw, but a f -series blower with run a 96lb injector at 80psi of fuel pressure out fuel at 730rwhp.
Hope this helps and Andy the guy that has helped me though out the years has done over 2500 e85 conversions and over 250 600+rwhp cars. In the last 4 years over 20 600+ cars for my self and customers. He has more Data than anyone one on the fuel, and combos wheather it be Na or turbo or blower.
Dan