I'm out of race gas and don't want to buy anymore since my engine is perfectly happy on 93 pump gas. What AFR should I be looking for at idle and WOT with the 10% alcohol in the gas?

I dont waste my time using the meter to set idle...
make it idle as nice as possible... then for WOT set
it for best MPH... no engine is alike and there is
no magic number thats best

I lost 3 tenths and 4mph right out of the gate with the fuel change. Jetted up a bunch today and am now only down 1 tenth and 1mph. I'm going to put in a FAST AFR meter I picked up and figured that may give me an idea where it's at. But I guess old school is still the way to go ey?

If its Ethanol based pump 93, then 12.5-12.7 at WOT....No leaner than 12.7

I have had some 93 octane pump gas that was advertised as containing 10% ethanol. It checked as 6% but still made best hp on the dyno with an AFR of 11.8 to 1.
It depends on how efficient the engine is too.
As P-body said,every one is different.
Keith

like he said

Quote:

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If its Ethanol based pump 93, then 12.5-12.7 at WOT....No leaner than 12.7

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