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Old 12-04-2012, 10:57 AM   #18
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Member#: 245218
Join Date: Apr 2010
Chapter/Region: South East
Location: FL
2013 STI Limited


Originally Posted by drewvdw View Post
So a boost leak wouldn't affect AFR?
Originally Posted by drewvdw View Post
Yes, checking his AFR is a very easy way to see if there's a possibility of a boost leak. It's a hell of a lot easier than manually checking each connection, especially if you've got a front mount.

What I'm getting at is checking AFR will not confirm nor deny boost leaks. He should check for boost leaks regardless of what his AFR reads. Boost leaks do not always have a huge affect on WOT AFR. As OP stated above his AP is reading 11.14 which is safe, however this does not prove there are no boost leaks.

The fact that the peak boost as slowly lowered over time makes me think some sort of boost leak has developed.

OP, when you are see 61% WGDC what is your turbo dynamics doing? Trying to add more boost? If you peaked at 61% then your tuner is not using 90% in the WGDC tables. He must have gotten it worked out or gave you some incorrect info. Maybe he set the max allowed WGDC to 90% but that does not mean the ECU will always go that high. Its WGDC table + Turbo Dynamics = final WGDC.

If you had a boost leak somewhere and your max WGDC was 50% in the table at WOT then turbo dynamics added 11% (max) trying to reach boost target and still cant reach target. That sounds a lot like a boost leak. I would be curious to see a log of a WOT run in 3rd that shows Boost, Target Boost, TD error, TD Integral, TD Proportional, and MAF grams per sec.
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