Quote:
Originally Posted by nick_casper
I run 10% ethanol because it is what the car was tuned on. With 15% ethanol on the way will it be safe to run with the same tune? Would we be better off running ethanol free or E15 with an E10 tune?
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Depends on your tune.
#1 The octane would still have to meet or exceed what's recommended... for a supercharger running any real boost, I would think anything less than 91 octane is "bad". Even 93 is "bad", lol.
#2 Even if the octane is right... an extra 5% eth in E15 is going to make it run slightly leaner than E10.
Bottom line, run what the tune is designed for, if you have flex fuel and the octane is sufficient, then you should be ok.
If the octane is too low it's asking for trouble.
If the octane is ok, but you dont have a flex fuel tune... then it's going to run a little leaner, which is especially bad for a sc. Enough to cause problems? Don't know, depends on your setup.
With no flex fuel, the eth free is prob better because it will tend to run richer. It's counter-intuitive because it will run richer, but consume less volume of fuel.