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i did drive some ethanol in my mx5 (miata). the car is verry rich running in open loop. with plenty of ethanol it was at lean verry often. cold start, cold run (was noticeable affected, some kind of bad throttle respond), WOT, and high revs. as long as the o² sensor was aktive, everything was normal. with the higest level of ethanol i tryed, the open loop was lean burn always, with one exception: verry high revs, 5500 rpm and more. in this area the setting is so rich, the ethanol doesn´t catch up.
in the mx5 i can adjust the FAR with the airflow sensor. i decided to klick it to the lean side so far, that the open loop will stay in the middle of the scale, maybe a little lean. then the verry high rev setting will be rich of course. for safety on trackdays.
fiddeling with ethanol is to complicated for me, i will make a one for all setup. if i hadn´t the adjustment to make, i would search for the best percentage of ethanol.
btw, AFR is monitored by a ARF gauge and the stock o² sensor.
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