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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Losing boost overtime (posted logs)



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      10-26-2023, 07:39 AM   #1
Rs-Shade
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Hello all I have recently upgraded from a 5” ic to the bms 7.5” stepped ic and am enjoying the much lower IATs. But I noticed when doing a pull that boost would slowly decrease as the rpm’s went up. What could be the cause of this?

Here’s the log from said pull ⬇️

https://datazap.me/u/rs-shade/losing...og=0&data=3-20

This is a log from when I had the 5” for contrast ⬇️

https://datazap.me/u/rs-shade/log-16...og=0&data=3-20
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      10-26-2023, 12:55 PM   #2
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Boost leak. Jokes aside that's weird how it tapers downward in linear amount. The DME is pulling boost obviously. What maintenance has been completed?
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      10-26-2023, 02:41 PM   #3
SlowE92
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Quote:
Originally Posted by Rs-Shade View Post
Hello all I have recently upgraded from a 5” ic to the bms 7.5” stepped ic and am enjoying the much lower IATs. But I noticed when doing a pull that boost would slowly decrease as the rpm’s went up. What could be the cause of this?

Here’s the log from said pull ⬇️

https://datazap.me/u/rs-shade/losing...og=0&data=3-20

This is a log from when I had the 5” for contrast ⬇️

https://datazap.me/u/rs-shade/log-16...og=0&data=3-20
Your WGDC climbs as well, looks like they are compensating for a possible boost leak. Even on your 5" log it did something similar. If I remember correctly you're running pure stage 2's, so they should have absolutely no trouble targeting 19 PSI.
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      10-26-2023, 05:49 PM   #4
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Quote:
Originally Posted by Jaronbwall View Post
Boost leak. Jokes aside that's weird how it tapers downward in linear amount. The DME is pulling boost obviously. What maintenance has been completed?
Recently walnut blasting, oil, trans fluid and filer
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