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Topic Re: E85? |
I am not certain, but have read (in Pano).... grant - 7 years ago |
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babamoto
Do any of you guys, or ladies if you are one, use E85 (ethanol/pump gas mix) in your Boxsters or other Porsches (maybe GT3s)? Does it damage Porsche engines? A neighbor kid says the only difference he's noticed is that his Nismo GTR engine takes a couple of extra tries in the morning to turn over. Hm.
Babamoto
Los Angeles
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MarcW
Quote
babamoto
Do any of you guys, or ladies if you are one, use E85 (ethanol/pump gas mix) in your Boxsters or other Porsches (maybe GT3s)? Does it damage Porsche engines? A neighbor kid says the only difference he's noticed is that his Nismo GTR engine takes a couple of extra tries in the morning to turn over. Hm.
Babamoto
Los Angeles
Grant covered it.
I will add I'm not sure Porsche has signed off on the idea of running 15% ethanol that I guess the EPA is trying to shove down everyone's throat. No way E85 is sanctioned by Porsche.
The Porsche engine management system is not designed/intended to detect/determine the amount of ethanol in the fuel system. As a result the fueling would be wrong. The DME would try to correct this but without the ability -- so to speak -- to recognize E85 (or some blend between a "pure" E85 and E85 mixed with E10 in some ratio) and on the fly adjust its thresholds it would likely go too far and trigger a CEL.
The engine would need lots more fuel. While the engine tolerates 14.7:1 air:fuel with ethanol free gasoline and E10 (or something in between) in the tank pure E85 would require an air/fuel mixture around 8:1. The injector duty cycles would be much higher and would probably result in shorter injector life. There is the question too of whether the fuel system would be capable of supplying sufficient fuel as the fuel flowing through the system would nearly double. At higher engine speeds/loads the engine might run lean due to insufficient fuel supply.
Let the neighbor kid have his fun. In the meantime my advice is for you to stay the heck away from E85. The Porsche engine will tolerate E10 (and word I have is refiners have stayed below 10% ethanol instead E10 is more like E7 or E8) without harm but beyond that you would be in uncharted territory and a Porsche engine is not what I would use to experiment with different and unsanctioned fuel blends.