02-27-2024, 05:41 PM | #1 |
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335i not hitting MHD boost targets
The car always seems to be 2-3 psi below target.
Stage 2 pull https://datazap.me/u/devin/2014-335i...&mark=85-61-59 |
02-27-2024, 05:44 PM | #2 |
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You need to enable throttle position and WGDC (and probably some other paramters) in your logs but looks like it could be a boost leak. You didnt list mod or recent maint. or anything; have you smoke/pressure tested? Are you 8AT? If so you should log 4th
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02-28-2024, 08:10 PM | #3 |
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Ok I turned on the settings you said and did it in 4th. The boost seems better on this pull I also noticed I only get a -0.1 psi vacuum on idle shouldn’t it be a lot higher. And would a vacuum cause low boost?
https://datazap.me/u/devin/stage-2-pull?log=0&data=4-20 |
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02-28-2024, 08:40 PM | #4 |
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Not necessarily RE vacuum. Are you asking if vaccum leak causes low boost? depending if its pre- or post-turbo leak.
In the new log WGDC looks reasonable and you are within ~1psi so if there is a leak its probably not a big one. I havent ran the 2+ 91 map in a long time but here's a log of 2+ E20. https://datazap.me/u/thejeremyman9/2...&data=4-5-7-22 i am closer to target but i did everything i could with aftermarket orings etc and have pressure tested |
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05-03-2024, 11:37 AM | #5 |
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I talked to MHD about PWG cars not hitting exact boost targets, and it seems to be a common and a normal occurrence, that the variance of a few psi is acceptable, esp up top where the PWG turbos cant flow well.
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05-03-2024, 02:13 PM | #6 | |
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PWG also runs a lower boost target at higher RPM, though. Boost control isnt as precise as EWG for sure so I wouldnt necessarily go chasing a boost leak for small deviations, but a few psi is quite a bit of power. |
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05-03-2024, 03:12 PM | #7 |
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https://datazap.me/u/devin/335i-stag...44&zoom=12-105
Last edited by 335devin; 05-03-2024 at 03:23 PM.. |
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05-03-2024, 04:09 PM | #8 | |
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Check the pearson fuels app/website to find E85 near you |
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05-03-2024, 04:27 PM | #9 | |
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Isn’t -8 degrees pretty bad and would that mean I’m getting knock or what? I have ran e85 before not a fan of getting gas every 2-3 days tho cause this is my daily. |
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05-07-2024, 11:37 AM | #10 | |
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