ZXMustang
Well-Known Member
I considered doing like a 13.00 afr tune and trying both 93 and E85 on it. Again it wont be full spark, but the stoich is close enough to the median that the fuel trims will compensate in either direction easily and you'd never know the difference. But I dont like the idea of a car adding fuel to compensate. Pulling fuel is always a better situation than adding in any scenario. So I scrapped that idea. I wouldnt feel comfortable selling that to anyone if I was iffy for that on my personal car.
And even in full E tunes, I still run my stoich at 10.0 rather than 9.80 since NOBODY ever truly gets perfect E from the pump. Even me testing my stock car with what tests at 85-90 at my local specialty station, the car is just about perfect with fuel trims at a 10.0 stoich and pulls fuel at a 9.80 stoich. This is why its important to both test the fuel as well as run the correct stoich for it. The inferred AFR tunes are likely to be way off and the car will just always be compensating in one direction or another.
And even in full E tunes, I still run my stoich at 10.0 rather than 9.80 since NOBODY ever truly gets perfect E from the pump. Even me testing my stock car with what tests at 85-90 at my local specialty station, the car is just about perfect with fuel trims at a 10.0 stoich and pulls fuel at a 9.80 stoich. This is why its important to both test the fuel as well as run the correct stoich for it. The inferred AFR tunes are likely to be way off and the car will just always be compensating in one direction or another.
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