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      02-24-2011, 10:01 PM   #90
Poor Kid with Dreams
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Drives: BSM 07 E90 335xi
Join Date: Aug 2010
Location: Danbury, CT

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Originally Posted by Joshboody View Post
Plenty have done this, but using race gas instead of WOT on 87... OUCH. The dme tries to get back to its curve fairly aggresively. you can see the slope is much greater in most JB logs because there's no correction.
Correct me if I'm wrong, but using a higher octane might be a different reaction than using a lower octane. I would think that it would be harder to adapt when the ECU is bouncing off the maximum timing tables. Or do you mean that it was tested where the ECU sensed knock on high octane and bumped itself down and then didn't try to keep the new lower timing at all? It just tries to advance timing a set amount in a set period of time no matter what and relies on knock events to go back down 3 degrees? Implying there are no "octane adaptations"?

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