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Old 08-03-2009, 01:33 AM   #9
Scooby Specialist
Member#: 156973
Join Date: Aug 2007
Chapter/Region: International
Location: Adelaide, Australia
2002 ADM WRX STi
STi Black/Blue


Originally Posted by 69subaru360 View Post
The 93 octane E10 we get here is really good stuff. I have great results with it, it's very knock resistant. But it can vary in quality.
Don't get me wrong, I am not saying E10 is a poor performer, I have had great results using it - I just wanted to point out it has quality issues and your tune should factor that in for engine longevity

Originally Posted by 69subaru360 View Post
On E10 I'm happy if my fuel learning stays within 10% tank to tank. That's what learning is there for, differing fuel quality. On straight gasoline I try to keep learning within 5%.
5% min is what you want. 10% is too high and you are sacrificing a lot of your headroom and limiting your margin of safety.

Originally Posted by 69subaru360 View Post
Some people shoot for 2% but that can be difficult.
On E10 I had around <2%, on straight pump I have <1% - and that is with non-standard larger injectors

It is all in the tune. Spend a little time on it and less than 5% is not that hard - even with inconsistencies in fuel quality.

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