Originally Posted by
PurpleMinivan
Don't read into this too negative but dropping a second in the quarter mile isn't going to happen by just adding 10* of timing on a bolt on truck. Not all the truth is being told...
e85 is comparable to 114-115 octane because of it's make up and how it burns and how much is used. Octane has nothing to do with why certain fuels need more or less fuel... it's the stoich of the fuel among other things like if it's oxygenated and so on. regular gas has a stoich of say 14.7... what you get at the pump now-a-days has ethanol in it, up to 10%... The new stoich of pump gas is around 14.2 depending on the seasonal blend you get. C16 has a stoich of around 15.0, depending on the brand. E85 has a stoich of 9.8 ish... To simplify, the lower the stoich the more fuel/volume you need. Say your setup is happy with 12.5 AFR WOT,verified by checking the plugs on "the new" pump gas (stoich of 14.2)... If you change to e85 (stoich of 9.8) you might be looking for 7.8-8.0 AFR WOT on the same setup, again verified by reading the plugs. Every setup is different, so don't take the numbers I threw out as fact...
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