Quote:
Originally Posted by bigsixman
I live in northern MN and we only have true E85 two months of the year and it ratchets down to E70 through the winter. A friend dynoed his motor and set the carb up in midwinter with winter blend E85 and by the time he got the motor in the car it was early summer and he was way off on his tune and jetting using the E85 sold during the warm weather months. His 540" bbc picked up 40 ft lbs and 25 hp over pump gas. It is a 10 to 1 pump gas motor in a street car. It works fine except the gas tank is alittle small because of the higher fuel consumption.
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The experience of those who know E85 say that going from E70 to E85 blend is worth about 2 jets sizes larger, (needs to be a little richer), but it should not make your tune-up "way off" if it was close to begin with. Some setup with E85 and never change jets, as the cooler weather itself cancels out some of the effect. But this is why a tester is very important so you have a starting point to know if it could be the fuel or some other variable if the car begins to not run properly.