Quote:
Originally Posted by jamesm
because the difference in the amount of fuel required is less than the maximum correction allowed by the ecu. so, it'll just trim like crazy and be all over the place but you'll still see stoich afr at idle after it settles down, and if you drive around easy long enough to let the ltft settle in D, open loop will be reasonably fine. i'm not saying it's a great idea, just that 'maxing' the fuel trims would be an issue, and this doesn't happen in this case. wrx's with 15% trim caps are more likely to actually not hit targets due to density variation.
it takes a lot to convince this ecu to do something stupid.
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Test your theory @WOT running a pump map on E85 and let us know your results in both NA and FI trim. Or moreso with a 60/40 blend or even a 50/50. Because Ive told many people in the past that is you run E85 on pump and didnt have time to swap maps your car will drive normally. But @WOT youll still be well short of your fueling needs. And besides the fact that your car can adjust fuel trims on the fly that doesnt help you when you blend varies by more than 10% fuel. Nor does it help you when you need to make significant timing adjustments based on an unknown amount of ethanol percentage. Running pure on either side of the blend isnt what this thread should be about. In some cases you will need to run a blend and will find yourself running a blend for whatever reason and always being able to have a safe basis of doing so. I have customers who drive their cars from across multiple states on a regular and find themselves mixing and matching fuels on their trips.