2004, c38-81 blower, 1000cc Grams injectors, 320lph Grams pump, bone stock motor, stock exhaust system except Berk hfc. My next step was to determine ethanol compatibility and if I have enough headroom based on expected power.

 

S2000442 just ran his on E85...specs...Walbro 450plh E85 pump...ID1300's... SOS return system...55psi base pressure @ 80% duty cycle. You might need bigger injectors.

I'm on the same except AEM 320plh E85 pump and id1000's. I'm at 82% duty cycle on pump gas.

 

Flashpro can't handle Flex Fuel from what I've heard.

 

Flashpro just can't "Flex" between gasoline and E85. It CAN run it.



Fuels...

E85... is an abbreviation for an ethanol fuel blend of 85% denatured ethanol fuel and 15% gasoline or other hydrocarbon by volume, although the exact ratio of fuel ethanol to hydrocarbon can vary considerably while still carrying the E85 label.



Gasoline...a volatile flammable liquid hydrocarbon mixture used as a fuel especially for internal combustion engines and usually blended from several products of natural gas and petroleum

"Flex fuel" ...a term used by vehicle manufacturers to describe a fuel system that can "flex" between gasoline and E85 ethanol. "Flexfuel" is NOT a fuel it is a term.

Flex fuel...adjective
relating to cars or engines that can run o nmore than one type of fuel, usually petrol and ethanol

 

Interesting. I'm at about 65% duty, so I was thinking I'm probably ok on injectors.

I haven't checked my fuel pressure, but I'm on stock fpr.

 

Average increase in fuel delivery needed to maintain current power when moving to E85 is 20%. Its not nearly as efficient/volatile as gasoline, and that’s what makes it work so well at suppressing detonation. As you increase your power, your fuel demands will go up from there. So plan on at least a 30% increase in fuel capability you have now.

 

50-100whp can be gained on e85 on the same boost leve. On my turbo s2000 I make 450whp on 91 octane at 13-14psi. During the e85 tune my power was already at 510whp with just increase timing at the same boost level as the pump gas tune. I ended up at 620whp at about 20psi on e85. But we just stopped there it would have made move power.

With my evo 8 it made 400whp on 91 octane at 22psi and it made 500whp on e85 at the same boost level.

 

Average increase in fuel delivery needed to maintain current power when moving to E85 is 20%. Its not nearly as efficient/volatile as gasoline, and that’s what makes it work so well at suppressing detonation. As you increase your power, your fuel demands will go up from there. So plan on at least a 30% increase in fuel capability you have now.
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Translation - I will be VERY borderline!

Sounds like I may as well go to 1300's to play it safe. But right now this is just a mental exercise. It'll be a while until there's room in the budget for all of this. Thanks to everyone for satisfying my curiousity

 

E85 s2000 turbo/supercharger setups typically need at least 1300cc injectors and normally always max out 1000cc injectors.

 

One would assume that when someone says they want to run flex fuel that they want the cabability to run any ethanol composition they want, I.e. have the capability to flex between 93 octane and E85. That would involve an ethanol composition sensor feeding composition percentage data back to the ECU to have it interpolate between a set of data points and modify fueling and timing accordingly. Flashpro can not currently handle that. That's all I was trying to say.

If OP wants to run a dual-fuel setup where he runs exclusively 93 octane or exclusively E85, that's a different story that Flashpro can handle. But the phrase flex fuel suggests that isn't what he's after.