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Originally Posted by LukasC So guys i know we have a few members running E85 and they are making some good numbers! A gas station opened up very close so
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Edit: From 2009 Owner's Manual, page 9-3: Quote:
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I am hoping to tune on E85 in the near future. I wouldn't think there's too much to be gained unless you are running forced induction, but I may be wrong!
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It is true that there is less BTU per gallon in E85 than gasoline and requires much more of it to burn in a stoich mixture. MPG is irrelevant due to that fact and the fact we're talking about power, not "miles per gallon", which is not the same as engine efficiency. One reason diesels get better 'MPG' is because diesel oil is much higher in BTU content than gasoline. As a general (read: not 100% true) rule of thumb, the heavier the petrochemical, the more BTU is locked up in it. Ethanol is much lower viscosity and specific gravity than gasoline, therefore you need more of it to get the same amount of work done. That said, it is 105 octane from the pump and has a much lower combustion temperature. Forced induction cars can see upwards of 20% gains simply be re-tuning on E85. N/A cars can see gains too depending on the setup and specifics. I'm planning on re-tuning for E85 as soon as I get a fuel cell. Our cars aggressively modify ignition timing based upon fuel quality and coolant temp. Bumping to 105 octane while reducing combustion temps is a win-win. |
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#4 (permalink) | |
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While it is true that hydrocarbons (LPG/gasoline) follow the "denser = more energy" rule - Ethane, Methane, Propane, Butane, Gasoline are increasingly denser and have more BTU - EtOH is not a hydrocarbon. EtOH, while having less energy content (21.2 MJ/L vs 34.8 for gaso and 38.6 for diesel), is more dense (0.79 g/cm3 vs 0.71–0.77 for gasoline).
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So yeah, for hydrocarbons, heavier is more, not necessarily true for other compounds. |
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Lukas, your car will consume lots of fuel (probably 30% more) on e85. If this is your only car and you do roadtrips frequently, I'd think twice about the jump to e85. Gains are decent, but this is still an NA car. If that isn't a concern, then you'll need a larger fuel pump and injectors along with the tune.
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heehee Reading back over my comment, I can see where it could come off stronger than what I intended. It's not my place to tell someone what to do with their car.
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