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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 > POLL: How many of you have the turbo siren sound from your stock turbos?



View Poll Results: Turbo siren?
Yes, only when cold 37 16.52%
Yes when cold, yes when warm but quieter 56 25.00%
Yes, all the time 39 17.41%
Never 92 41.07%
Voters: 224. You may not vote on this poll

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      03-26-2013, 07:34 PM   #111
e92ben
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Mine only happens when it's cold and it's very faint. Have you tuned yours yet and ran it to redline?
Ran to redline a lot after 500 miles (idk why but I just waited lol)
jb4 g5 iso installed, and redlined... No whine
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      03-26-2013, 07:36 PM   #112
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Originally Posted by e92ben View Post
Ran to redline a lot after 500 miles (idk why but I just waited lol)
jb4 g5 iso installed, and redlined... No whine
Hmm. Guess my theory is wrong then. Lol
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      03-26-2013, 07:42 PM   #113
e92ben
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Quote:
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Originally Posted by e92ben View Post
Ran to redline a lot after 500 miles (idk why but I just waited lol)
jb4 g5 iso installed, and redlined... No whine
Hmm. Guess my theory is wrong then. Lol
I'm sure your turbos are fine I mean the n54 is just so noisy. All sorts of noises all the time lol. I'm used to it but my friends think all the engine noises sound like shit.
My girls 07 335i had 137k before we sold it. No rattle or whines.
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      03-26-2013, 07:48 PM   #114
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Originally Posted by e92ben View Post
I'm sure your turbos are fine I mean the n54 is just so noisy. All sorts of noises all the time lol. I'm used to it but my friends think all the engine noises sound like shit.
My girls 07 335i had 137k before we sold it. No rattle or whines.
It's true
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      03-26-2013, 10:08 PM   #115
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I too have the whistle noise, only after starting the engine and then only for a few miles untl it starts to heat up.
For me it rater sounds like a sound caused by pressurized gases going through a small orifice.

There is no direct relation between the turbos rpm and the sound (wich would cause some sort of hardwired frequency in relation to the turbos rpm's)
but rather between the boost/catback pressure and the sound.
The sound immediately stops when going off throttle (when shifting), but the turbos themselves then still spool at high enough rpms wich should still cause the whistle,
wich is not the case.
My conclusion is that the whistle isn't caused by a mechanical part in rotation, but rather some sort of internal "leak" until parts are warming up.
Could be bad internal tolerances or worn shafts (perhaps even the wastegate lever shafts) or whatever else.
As even some brand new turbos are causing it I wouldn't worry too much, I really doubt BMW is selling broken genuine stock turbos.

Last edited by serotoninsteve; 03-26-2013 at 10:20 PM.
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      03-26-2013, 10:18 PM   #116
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don't know if this adds anything to the discussion but I never had this till I installed dp's hated it so much that after 3months of running these pulled them off and reinstalled factory dp's and now I still have the siren noise but a lot more faint then with them . noise is only when cold, after car warms up its completely gone.
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      04-02-2013, 03:17 PM   #117
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I have this noise, after installing my catless downpipes.... i had my turbos replaced for wastegate rattle a little over 10k miles ago... maybe time for new ones?
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      04-03-2013, 10:17 PM   #118
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Anybody have any theories they would like to throw out there? I have laid mine out. None have a clear conclusion however. Has anybody had a serious issue due to this noise?
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      04-04-2013, 10:52 AM   #119
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my car sounded like crap. almost got to the point that I thought the turbos were going to explode. it would be a loud siren, then almost raspy if pushed a little more. and I'm not talking full throttle, maybe a third. especially in the taller gears. it was so loud, it was embarrassing and didn't want to pass anyone. Dealership called today and will be replacing them under cpo. they said it took them a while to narrow down and reproduce the sound. they must have not taken it on the highway. they also said it hasn't been common for them. they said they replace a lot for the wastegate though.
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      04-04-2013, 12:02 PM   #120
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Let us know how the new ones fare out.
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      04-05-2013, 09:29 PM   #121
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The siren is getting louder for me on this new set. Louder when cold, now takes a bit longer to go away.
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      04-07-2013, 12:58 PM   #122
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Update: i have posted on this thread for the same siren sound that some of us have, including me. i have a jb4 g5iso and with the wastegate position set to 10 i have noticed the siren gone. Went back to 80 and sound was back. I tried it once more at 10 and it was gone. I hope that this may help out some for those that have this siren sound. It may not work for everyone depending on the condition of your wastegates. Its odd i know but it works for me.
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      04-11-2013, 06:15 PM   #123
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Just got her back last night. The car is a whole new vehicle now. So smooth, no noise whatsoever. I had an idle issue and that's gone now too. Also smelled like I was burning oil. One turbo was leaking oil onto the exhaust.

Got another good word. The tech accidentally dropped my water pump and they replaced it in addition. Gotta love that. All covered under CPO.
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      04-22-2013, 04:04 PM   #124
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Update, siren is audible when fully warm now. Just faint. 1,000 miles on new turbos.
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      05-12-2013, 10:18 PM   #125
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I just got new turbos and have this noise as well
WTF
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      05-12-2013, 10:56 PM   #126
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I just got new turbos and have this noise as well
WTF
General consensus is it's normal. My new ones do it too.
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      05-13-2013, 06:17 PM   #127
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General consensus is it's normal. My new ones do it too.
Its sooo annoying!!!!!!
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      05-13-2013, 06:19 PM   #128
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Its sooo annoying!!!!!!
How bad is yours? Any video clips?
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      05-13-2013, 07:59 PM   #129
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haven't noticed it.
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