Quote:
Originally Posted by Sirrotica
My previous post is based on hauling ethanol to the loading racks from the distilleries and hauling E85 to the stations here in Ohio. So that should end your concern about myths, all real experience with the fuel not hearsay. The post didn't say that there would be a problem or try in any way to sway anyone's choice of fuel, I just validated what John said about knowing exactly what you have in your tank. There is no way to know exactly what octane your buying or what blend it is.
With the percentage varying of gas to ethanol blend the ECM in a modern car adjusts the fuel air mixture to compensate for whatever you last bought. The only way you have to vary mixture with a carb is manually changing jets, not only does the ratio of gas to alcohol change so is the octane changing. A loading rack does not tell customers what octane gas they cut it with, or what percentage they use when they blend it. Cold hard facts, not meant to say your going to have trouble, just that there can be a large variance from one load, or one gas station to another. You can do whatever you want with the info and it won't hurt my feelings in the least.
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Most e85 is made with low octane gas. IF making E85 from E99 its highly recommended to
NOT cut it with race gas. Purpose of the gas in first place is to help lite it off especially when cold. Low octane gas lights off easier than race gas.
You can test it at the pump if you want... just buy a small quanity and put some in your tester. Only takes a few minutes. Testers are inexpensive or you can make your own.
BTW the Feds DO have standards as to whats allowable for motor vehicle use. Currently E10(typical pump gas) and E70-85. Its currently NOT legal to sell E15 E30 E60 from the pump in vehicles intended for highway use.
If you are tuned for 85% and get a load at 70% your going to run somewhat richer ... Some racers tune for 70% and dilute their fuel with gas if the percentage of alcohol is significantly higher... most just rejet if carbureted. You can buy E99 by the barrel and either make your E85 or use it to adjust E70 up to whatever level you want.
Racers have reported no detonation differences if tuned for mix they run. Though typically rated around 105 octane, racers, especially guys running boosted motors, many are running
same or greater boost than they could run on c15 which is race gas specifically formulated for boosted motors. E85 helps cool the charge temps making the fuel mix less prone to preignition/detonation.