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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 > Low Boost / Loud Whining Sound / sounds supercharged



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      08-15-2022, 07:04 PM   #23
theOkilla
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Small update - I had my battery tested and itís bad. Iíll replace it tonight and see if the issues persist. Iím hoping it was just making the rest of my electrical system work too hard?
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      08-16-2022, 07:08 AM   #24
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that is not turbo whine. sounds like power steering
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      08-16-2022, 08:45 AM   #25
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Battery didnít change anything. Car still whines very loud and it sounds like itís coming from right in front of me while Iím driving. Waiting on boost solenoids to come
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      08-16-2022, 01:49 PM   #26
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Power steering fluid is full. Donít see any oil filter issues.

Sound is coming from directly in front of me and definitely gets louder with higher RPMS.
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      08-16-2022, 05:01 PM   #27
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Quote:
Originally Posted by theOkilla View Post
Power steering fluid is full. Donít see any oil filter issues.

Sound is coming from directly in front of me and definitely gets louder with higher RPMS.
Is the whine audible when you rev it at idle?

If so, you might be able to narrow it down with some help using something like a stethoscope?
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      08-16-2022, 08:18 PM   #28
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No I couldnít hear the whining sound at idle - only while driving.
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      08-16-2022, 08:41 PM   #29
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Another thing - I pulled the vacuum canisters and some lines out to make more room. When I pulled a line off of one canister it hissed for a while, the other one didnít make any noise when disconnected. Iím not sure if theyíre supposed to be independent or not.
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      08-17-2022, 06:58 AM   #30
pysical
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Quote:
Originally Posted by theOkilla View Post
Power steering fluid is full. Donít see any oil filter issues.

Sound is coming from directly in front of me and definitely gets louder with higher RPMS.
It can be full but still be bad. My car was making some noises that had me almost ordering a new steering rack and ps pump. I did a fluid flush and now it is normal.

Does the noise happen if you turn the steering wheel?
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      08-17-2022, 12:29 PM   #31
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Quote:
Originally Posted by pysical View Post
It can be full but still be bad. My car was making some noises that had me almost ordering a new steering rack and ps pump. I did a fluid flush and now it is normal.

Does the noise happen if you turn the steering wheel?
It makes the noise even when driving in a straight line on the freeway. Itís perfectly synced with the engine RPM. Does not get louder when turning
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      08-18-2022, 10:30 PM   #32
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Installed two new boost solenoids - zero improvement and still only reaching 7psi.
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      08-19-2022, 06:55 PM   #33
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Bump - anyone have any other ideas?
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      08-21-2022, 07:34 PM   #34
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Any help would be really appreciated.
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      09-06-2022, 03:07 PM   #35
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What are you using to measure your boost PSI? I've had issues with some Android apps, that did either not report boost PSI at all, or numbers that at least appeared wildly wrong.
Are you getting any low boost codes?
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      09-06-2022, 04:53 PM   #36
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This is cheap and worth a shot. Assuming the vacuum lines from your vacuum pump are good, replace the hard line off the vacuum pump.

P/N: 11666769086

If it's leaking, your wastegates won't get the vacuum they need and if it's big enough I'm sure it'll whine. Since your WGDC aren't climbing this system would have my focus, especially since you said the sound appears to be coming from right in front of you.

Also, log boost setpoint and boost mean and get back to me. I have another idea.


I checked your datazap profile, all is good now? Where was the boost leak?
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Last edited by Dave92N54; 09-06-2022 at 05:02 PM..
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