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      09-16-2012, 09:12 PM   #38
andrew_b
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Drives: 2007 E93 N54
Join Date: Sep 2011
Location: Lexington, KY

Posts: 167
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Quote:
Originally Posted by Ænema View Post
Be sure to disable traction control next time and while your're logging get a couple multi gear logs and atleast one single gear pull, preferably 3rd gear. Be sure to use the default logging channels.
Only thing I'm not sure how to do is to get a single gear pull in 2nd or 3rd, since the auto downshifts...which is why I began with just starting the log and keeping it running until after the upshift to 4th, then parsing the log out. Tips on how to get pure single gear pull with the auto tranny appreciated.

Quote:
If the throttle closure is not traction control related you're probably overshooting boost targets.
So looking at the two logs again, I'm wondering if it's indeed overboost induced. In both of the cases of TPS closure, the boost mean is higher than the boost requested.

pull 1: boost mean: 32.15, boost req: 29.71, TPS dropped to 40.03%
pull 2: boost mean: 31.32, boost req: 29.45, TPS dropped to 58.92%

Both occured at the bottom of the RPM drop (4590 and 4572) when it shifted from 1st to 2nd.

If that is what is causing it, what can be done?
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