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Old 09-04-2007, 11:07 AM   #4
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Join Date: Jun 2006
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Location: North Dakota
2015 WRX Limitec


Originally Posted by dlh1999 View Post
IMO, you'll probably want to switch to a 91 octane map pretty soon. You're basically making your current map lean out the car a little because it expects 93 octane but you're only giving it 91 (which, I hear, isn't great quality in some parts of California, Nevada and Arizona). It'd be pretty safe going the other way (ie. 93 octane with a 91 octane map) because rich is better than lean, but probably not the best idea vise-versa.

octane doesn't have much to do with the AFR. the AFR won't change (much) with different gas. what does change is if the car knocks or not, at a certain RPM it might need more fuel to prevent knock, even though it technically isn't lean, or at least any more lean then before.
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