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alphasaur · 12-19-2022, 06:21 PM

ethanol has a different stoich value than regular fuel, it has to run richer to reach stoich (9.7:1), meaning you burn a higher amount of ethanol vs gasoline (14.7:1)

If your car is not tuned for it you risk running lean

ethanol has an effective octane of ~160 in direct injection engines which is why even a blend like e30 can have a huge positive effect when tuned in a direct injection engine.

HPFP issue likely come from the Mazdaspeed community as higher than 50% ethanol on that platform can lead to "black death" of the HPFP, it's really just oil and fuel mixing and gumming up the HPFP. This platform does not have that issue. I guess the HPFP might also have to work harder since more fuel volume is needed?

12-19-2022, 06:21 PM	#12
alphasaur friendly Join Date: Oct 2018 Drives: 17' 86 Location: Dutchess County, NY Posts: 734 Thanks: 1,483 Thanked 483 Times in 293 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	ethanol has a different stoich value than regular fuel, it has to run richer to reach stoich (9.7:1), meaning you burn a higher amount of ethanol vs gasoline (14.7:1) If your car is not tuned for it you risk running lean ethanol has an effective octane of ~160 in direct injection engines which is why even a blend like e30 can have a huge positive effect when tuned in a direct injection engine. HPFP issue likely come from the Mazdaspeed community as higher than 50% ethanol on that platform can lead to "black death" of the HPFP, it's really just oil and fuel mixing and gumming up the HPFP. This platform does not have that issue. I guess the HPFP might also have to work harder since more fuel volume is needed? __________________ Seek comfort in discomfort. Last edited by alphasaur; 12-20-2022 at 11:46 AM.