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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 > question, how do you know when the turbos are going bad?



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      08-09-2011, 10:43 PM   #1
lawwailok
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question, how do you know when the turbos are going bad?

have a question here for all the expert. how do you know when the turbos are going bad? i've seen videos of how the turbos whine. but also, will you see boost drop in that case? what other symptoms can we tell?

i've been having some problems, it's on and off, not always happens tho. if i am holding gear, when rpm rises, let's say 2500+, there's some sort of weird noise. i can only hear it when radio is off, window down. it is not exactly like those turbo whine video i've seen. but just some kind of "whine"... it's very fainted. i did datalog, all data looks perfect.

so i just want to see if there's any symptoms i can tell if the turbos are going bad....
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      08-09-2011, 10:59 PM   #2
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Turbo's make noises... dont find your problems let them find you
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      08-09-2011, 11:07 PM   #3
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Tell tale sign when seals fail ,,turbo burns oil n really bad smoking..you would get that b4 noise
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      08-09-2011, 11:15 PM   #4
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Quote:
Originally Posted by tibra1 View Post
Tell tale sign when seals fail ,,turbo burns oil n really bad smoking..you would get that b4 noise
i don't get any smoke at all
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      08-09-2011, 11:17 PM   #5
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Turbo's make noises... dont find your problems let them find you
true, but sometimes when there's something unusual or sounds odd, it feels annoying and want to find the root to fix it
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      08-10-2011, 08:10 AM   #6
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i just replaced my turbos..

They were leaking oil from the seals and the drivers side exhaust line was dumping smoke. The turbos were spooling and holding pressure fine, but they were on their way out. I also had an unbelievable amount of wastegate chatter, even after the BMW 8mm actuator swap.

Another telltale sign is a whistling turbo.

Here's a youtube video of it.. it didn't happen very often, only about 3-4 times over a 3 month period. I noticed it while driving and pulled into some random neighborhood to shoot this video before it went away.

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      08-10-2011, 12:55 PM   #7
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Quote:
Originally Posted by ///M3THOD View Post
i just replaced my turbos..

They were leaking oil from the seals and the drivers side exhaust line was dumping smoke. The turbos were spooling and holding pressure fine, but they were on their way out. I also had an unbelievable amount of wastegate chatter, even after the BMW 8mm actuator swap.

Another telltale sign is a whistling turbo.

Here's a youtube video of it.. it didn't happen very often, only about 3-4 times over a 3 month period. I noticed it while driving and pulled into some random neighborhood to shoot this video before it went away.
wow.... i have none of those symptoms... but just there's one sound which is annoying somewhat and cannot find out where it is from
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      08-10-2011, 01:53 PM   #8
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      08-10-2011, 02:28 PM   #9
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Quote:
Originally Posted by lawwailok View Post
wow.... i have none of those symptoms... but just there's one sound which is annoying somewhat and cannot find out where it is from
are you sure its not the sound of awesome?


what does it sound like?
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      08-10-2011, 03:19 PM   #10
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Quote:
Originally Posted by noobster View Post
are you sure its not the sound of awesome?


what does it sound like?
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      08-10-2011, 03:54 PM   #11
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Quote:
Originally Posted by noobster View Post
are you sure its not the sound of awesome?


what does it sound like?

it definitely doesn't sound like those "turbo siren", but more like some sort of accessory whine noise.. it is very fainted and not producing all the time.. it's kinda on and off thing... hard to describe.
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      08-12-2011, 05:46 PM   #12
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Dealer replaced mine last year after smoke issue started.
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      05-10-2012, 08:42 PM   #13
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Quote:
Originally Posted by lawwailok View Post
it definitely doesn't sound like those "turbo siren", but more like some sort of accessory whine noise.. it is very fainted and not producing all the time.. it's kinda on and off thing... hard to describe.
Any changes?? Did you ever figure everything out?
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      05-10-2012, 09:13 PM   #14
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Turbo's make noises... dont find your problems let them find you
Exactly what I was going to say. Don't worry about it. You'll know when they need to be changed.
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      05-11-2012, 01:44 AM   #15
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Quote:
Originally Posted by aw335can View Post
Dealer replaced mine last year after smoke issue started.
did you leave ur bolt ons on the car when they changed ur tb
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      05-11-2012, 02:59 AM   #16
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Quote:
Originally Posted by ///M3THOD View Post
i just replaced my turbos..

They were leaking oil from the seals and the drivers side exhaust line was dumping smoke. The turbos were spooling and holding pressure fine, but they were on their way out. I also had an unbelievable amount of wastegate chatter, even after the BMW 8mm actuator swap.

Another telltale sign is a whistling turbo.

Here's a youtube video of it.. it didn't happen very often, only about 3-4 times over a 3 month period. I noticed it while driving and pulled into some random neighborhood to shoot this video before it went away.


What can we do If we noticed same issue with this video ?
I have same smoke problem now.. with my rb turbos
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      05-11-2012, 05:13 AM   #17
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Im Not trying too highjack this thread but curious about turbos failing also. I have an 07 335i with 37,000. I have been running COBB tune for a bit now and recently starter using stage 2+FMIC. I dont believe I have any turbo issues, but Im guessing Id be looking for smoke as a sign of turbo failure? And I have a third party warranty. If at some point turbos did go bad, I could uninstall the COBB AP, but what about the downpipes? Could the stay on the car or would they also have to be removed. Again sorry, Im not trying to highjack this thread, just getting a bit of info. Thanks all..
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