Quote:
Originally Posted by Hib Halverson
Oxygen sensors sense lambda and 1.0 lambda is stoichiometric combustion for any carbon-based fuel be it pure ethanol or gasoline.
If you're going to try to cal for E85, know that...
1) Stoich for E85 is is around 9.8 but can vary because pump E85 often varies between 70 and 85% ethanol. So, you're going to need to calibrate for a lot more fuel flow, even at part throttle.
2) E85 is corrosive to metal parts of fuel systems not originally designed for it. Also, it may attack rubber and plastic fuel system parts.
If the car is close on passing the IM240 type test, I'd put some known good stock cats on it, then go get the cats really hot just before you test. If your car cools well, drive around the block several times at medium rpm in first gear then pull right into the test bay. Or if the test station is close to the expressway, drive in fourth gear at highway speeds for five minutes then go test.
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I'll likely blend my own E85 to control it better. I'll likely try some fresh cats out but with the cams, no secondaries, headers, ect... I doubt I'll get the 390 to blow cleaner than 48 HC at idle.
hoping the E85 (or pure alchy for that matter) would be an alternative
if the car could be calibrated to run on it without breaking the bank I'm not too worried about the limited exposure the fuel system would have.
I'd only have it in there long enough to get through the dyno/sniff test
I'd warm it up on gas, drain it, swap fuel & memcal, and drain it out an hour later.
I'm only a block from the emissions test so it wouldn't even have to run that great as long as it can run clean, go 25 or 30 mph, to get by the dyno test.
any advice on folks in Northern VA that might be able to help out with this.
Tony's Corvettes is the only folks that might take this on, but I'm sure they would need some remote help from a better tuner.
I don't have secondaries in the car either.