Quote:
Originally Posted by JrCRXHF
you guys might want to watch your air fuel ratio cause it changes when you are on e85
"You may have already read that E85 has a different stoichometric air fuel ratio than gasoline's 14.7. The stoich AFR for E85 (at 85% Ethanol) is 9.76. The stoich value represents an ideal perfect burn of the fuel usually used at part throttle conditions. Full throttle conditions require a richer mixture than stoich to prevent the dreaded detonation, or pinging."
I would look at my air fuel ratio again before you have big problems i tune E85 with lamda for that reason.
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Thats why you must have a wbo2 sensor installed at all times when running e85. Sometimes when the season changes the ethonal/gas mix will change to 75% not 85% like normal so yes you need to watch for that.
Also even if you do run a little lean on e85 the detonation characteristics are so good you wont even knock unless you run dangerously lean. If you run about 30% more fuel at wot than your gas tune that will give you a real good base afr.
My mechanic has been running e85 for more than a year now and has time to play with all types of afr's. He said the safest afr to make the best power is around a 11.1 afr from his experience.