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Old 05-09-2007, 05:54 PM   #1
Scooby Newbie
Member#: 141285
Join Date: Feb 2007
Location: DFW- TX
98 2.2

Default E85 project, 98 2.2

I was thinking of running my 2.2 on e85. What besides larger injectors is necessary? I'm not concerned about the performance but i'm after economy as this car is a daily driver to work. I'm reading there is a drop in the mpg, would a programmable cpu help? This is a non turbo car.

unleaded 2.98 (and going up)
e85 2.50
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Old 05-09-2007, 06:30 PM   #2
Scooby Newbie
Member#: 882
Join Date: Feb 2000
Location: Michigan
2004 WRX Wagon
very blue


Well, there's 72% less energy in a gallon of E85 compared to a gallon of gasoline, so if you just changed over to E85 with no other changes, you'd get about 28% worse fuel economy (assuming your injectors, fuel pump, etc. were up to the task). That translates to $3.47 for an equivalent amount of energy as one gallon of gasoline.

A programmable ECU would let you take advantage of the higher octane properties of E85 by adding some spark back in. End result should be a reduced fuel economy hit, but you're still looking at 25% or so worse economy... Bottom line, tuning an NA car for E85 is not likely to help you save $ at today's current E85 costs. It won't help the environment either (emissions tend to be worse due to delayed cat lightoff). It will make your senator happy and help reduce dependence on foreign oil for automobiles though...
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Old 05-09-2007, 08:56 PM   #3
wall of tvs
Scooby Newbie
Member#: 29716
Join Date: Nov 2002
Chapter/Region: MWSOC
Location: Minneapolis
2006 wrx wagon
booze powered e85 monster


Well fwiw, I've been running 100% e85 for a little less than a month now in my WRX.

I've seen around a ~ 20 % decrease in fuel economy -- and the fuel costs around ~ 20% less than the premium 92 octane fuel here in MN. So essentially it's a wash in terms of $/mile driven.

However, I don't mind that; I switched over solely for the 105 octane benefit, hehehe.
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