Running 91 octane instead of 87
07-17-2012 | 12:39 AM
#55
I data logged with hpt a while back to see what the difference would be for higher and lower octanes. Your pcm will pull timing all day if you run 87. I was getting bumped down to the low octane table a lot. Any medium to high loads and the pcm picked up kr every time. That was half a tank of 87. Then I topped it off with 93 and got ZERO KR. And that was obviously not even full on 93. Anyone who thinks their car runs better on 87 is a tool bag.
FWIW the low octane table is about 10 degrees of timing loss in some areas and more than 5 at wot...so yes it does make a noticeable difference.
Its going to take a couple fill ups before the octane is all the way up to what you want it at as well since the couple gallons of 87 you have left will bump the octane down a bit so that could be part of the reason its hard to tell on the first fill up.
FWIW the low octane table is about 10 degrees of timing loss in some areas and more than 5 at wot...so yes it does make a noticeable difference.
Its going to take a couple fill ups before the octane is all the way up to what you want it at as well since the couple gallons of 87 you have left will bump the octane down a bit so that could be part of the reason its hard to tell on the first fill up.
sigh...facts and evidence on css.net.
Just drill some holes in the exhaust, good for 5 octane.
moar octane, moar powa.
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