Quote:
Originally Posted by Formulajones
The ethanol content will certainly affect the AFR, because stoich is much different (richer) with more ethanol content, and the carb should be adjusted and modified accordingly. Not all pump gas is the same.
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Pump gas can be up to 10% Ethanol. That's all you know about your pump gas, other than the octane level. How much actual ethanol that is in your gas will vary from station to station and tank to tank. It depends on how much ethanol cost at the time they were blending, how much RINs cost, how much the blender was willing to pay for carbon offsets, and several other factors.
There are bean counters and chemists working at the refinery to make sure the right blend of gasoline and ethanol makes it to the premium and regular tanks.
It isn't something that you can tune your carb around. That's why I run a mix of 90 octane ethanol free and 100LL. Ethanol has less energy per unit of volume, so you can make more power by getting rid of it from your fuel system.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning.
