Quote:
Originally Posted by javadog
Sal,
If you unplug the O2 sensor and the fuel quantity injected is the default amount set in the map, are you not lean anyway, when running the ethanol blend? Wouldn't you need a greater quantity of fuel injected than what is stored in the basic map, because of the lesser energy in the ethanol blend?
JR
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You can sort of compensate for the ethanol, you can adjust the AFR via the adjustment screw on the AFM at idle. Simply set base mixture at idle to 14.2 and this should help.
But my DME has a chip emulator and the maps are all far from stock. I have re-tuned all my maps to 14.2AFR.
But don't mis-understand me, ethanol has some draw backs like it corrodes and you need to burn more of it. But on the good side is it has a very hi octane 130 RON and when mixed with gasoline it helps further raise the overall octane of the gasoline. This is a good thing as it helps reduce detonation. It also packs slightly more energy into the same cyl volume. I have often thought about how these motors would run on E85? my bet is they would kick ass if properly tuned but you'd need to change all the fuel delivery system because of corrosive nature of ethanol. You also need a much higher flow fuel pump to pump 30-40% more fuel needed into the engine. If I had the money to make these changes it would certainly be a fun project. The tuning part is easy for me but not the $$$$.