JB4tech.com - International Turbo Tuning Discussion
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550L's 550L's is offline
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Join Date: Apr 2022
Car: 2015 550ix
Default Failing to make target boost plus occasional knock, please help. - 04-12-2022, 05:10 PM

I have a 2015 550xi, engine mods are as follows:
Stage 2 E30 BM3
Stage 2 XHP
Charge Pipes
******* DP's
Arm Front Mount Intakes
N63 Intake oil cooling valve
Lower temp thermostat
3.5 bar pre throttle TMAP's
NGK 97506 at 0.22" gap
Delphi Coils

Recently Replaced the following:
Pre throttle TMAP's
Plugs
Coils
All O2 sensors
Ran Liqui-Moly Fuel System Cleaner
Fixed boost leak with PCV

The car has occasional knock on data logs and cannot make target boost. It does not feel 100% normal when driving and feels slow. I recently took it to a shop and they said everything was fine, not burning any oil or coolant. There are no shadow codes and no CEL VIA ISTA.
Here are some data logs i got from today:
bootmod3 dot net/log?id=6256055ad10b435c47ba6fd9
bootmod3 dot net/log?id=62560518ae729b0653705bb6
bootmod3 dot net/log?id=62560518ae729b0653705bb6
bootmod3 dot net/log?id=6255e383c090c6511ab8d2b4

If anyone has any idea what it could be please let me know. I am out of ideas as to what it could be.
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Mike_L Mike_L is offline
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Join Date: Jun 2014
Car: 2022 X3 M40i
Default 04-12-2022, 07:31 PM

We don’t work with BootMod logs. And I don’t think most of us work with BM3 at all, and when we do, it’s purely back end with the JB4 controlling boost.


Mike Levy
2022 Black Sapphire X3 M40i
2010 Glacier Pearl Nissan Murano SL
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