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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 36 16.22%
Yes when cold, yes when warm but quieter 56 25.23%
Yes, all the time 38 17.12%
Never 92 41.44%
Voters: 222. You may not vote on this poll

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      11-15-2012, 03:59 PM   #45
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I noticed a howl/noise from my turbos after having AR design Hi-flo Cats installed but have to say its no where near like the noise in first post, also running JB4 and Forge intercooler. No smoke or reduced performance (quite the opposite infact )

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      11-15-2012, 05:41 PM   #46
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Quote:
Originally Posted by gangzoom View Post
I noticed a howl/noise from my turbos after having AR design Hi-flo Cats installed but have to say its no where near like the noise in first post, also running JB4 and Forge intercooler. No smoke or reduced performance (quite the opposite infact )

Hard to hear. Are you referencing the whine or the whistle?
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      11-15-2012, 06:09 PM   #47
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Quote:
Originally Posted by E90Company View Post
I don't think that covers the turbo whine unfortunately
yeah, wasn't sure about that.
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      11-15-2012, 06:13 PM   #48
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Quote:
Originally Posted by ign335i View Post
Are you suggesting we try and scam BMW into buying us new turbos because we jammed more than double stock boost through them?

I don't understand why people are surprised by this. You must understand the consequence of what you are doing when you modify a car, especially when you're working at the extremes of stock hardware... e.g. 150-200hp more through the turbos.
Scam? Hardly think I would every feel guilty in getting components covered by BMW that were caused by my modifications. BMW NA would take advantage of us so why not do the same? Besides, there may be some folks out there who have this sound, noted by the OP, who have not done any modifications their car.

but yes, Pay to Play I get that. No tear here if something goes wrong by my doing.
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Last edited by VNeBLOB42; 11-15-2012 at 06:37 PM.
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      11-15-2012, 06:18 PM   #49
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I starting hearing this noise after changing the filter. When using the stock filter I get no noise.
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      11-15-2012, 06:42 PM   #50
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Quote:
Originally Posted by ign335i View Post
Are you suggesting we try and scam BMW into buying us new turbos because we jammed more than double stock boost through them?

I don't understand why people are surprised by this. You must understand the consequence of what you are doing when you modify a car, especially when you're working at the extremes of stock hardware... e.g. 150-200hp more through the turbos.
Your response assumes causation; the number of cars out there running around with tunes that DON'T have this problem suggest another cause is the culprit.

In my case, lets just say my mechanic found concrete evidence of an install error. Should my tune override their negligence?
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      11-15-2012, 06:43 PM   #51
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Originally Posted by E90Company View Post
I don't think that covers the turbo whine unfortunately
Your right, it doesn't. Good thing that my turbos are only 7 weeks old, and BMW warranties all new parts for two years.
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      11-15-2012, 07:01 PM   #52
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Quote:
Originally Posted by VNeBLOB42 View Post
Scam? Hardly think I would every feel guilty in getting components covered by BMW that were caused by my modifications. BMW NA would take advantage of us so why not do the same? Besides, there may be some folks out there who have this sound, noted by the OP, who have not done any modifications their car.

but yes, Pay to Play I get that. No tear here if something goes wrong by my doing.
I mean, that's just ethically wrong. You are welcome to live your life that way though, I understand the desire to.

This sound is not exhibited on turbos that haven't been abused. This sound comes from over spinning the turbos and driving too much PWM through them. That is the cause. That isn't to say there aren't a couple defective units out there, there is no way to know really, but 99% of the time this is caused by overboost.
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      11-15-2012, 07:02 PM   #53
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Quote:
Originally Posted by atomos319 View Post
Your response assumes causation; the number of cars out there running around with tunes that DON'T have this problem suggest another cause is the culprit.

In my case, lets just say my mechanic found concrete evidence of an install error. Should my tune override their negligence?
What is that number? I don't think there is any sub 100k mile N54 with this sound that has NOT been overboosted. You are assuming people haven't had tunes run on their cars based on what? 99.9% of n54 owners on forums have a tune or have had a car that had had a tune on it before.
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      11-15-2012, 07:20 PM   #54
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Quote:
Originally Posted by ign335i View Post
I mean, that's just ethically wrong. You are welcome to live your life that way though, I understand the desire to.

This sound is not exhibited on turbos that haven't been abused. This sound comes from over spinning the turbos and driving too much PWM through them. That is the cause. That isn't to say there aren't a couple defective units out there, there is no way to know really, but 99% of the time this is caused by overboost.


Really? How do you know that? Are you an expert on these turbos? On what empirical evidence are you basing these conclusions on?**

** Not that I purport to be. But at I least know what I don't have the actual knowledge to claim I know.
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      11-15-2012, 07:38 PM   #55
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Originally Posted by ign335i View Post
I don't think there is any sub 100k mile N54 with this sound that has NOT been overboosted.
But you DON'T know that though, do you? To a reasonable degree of certainty?


Saying that overboosting is the only possible cause because the only n54 turbos that **you** have heard of making noise were tuned, is as logical as saying that the only people who die from a heart attack under age 50 must be overweight and smoke cigarettes, because everyone **you** ever knew who died of a heart attack under age 50 was fat and smoked.

Last edited by KaiserN54; 11-15-2012 at 08:30 PM.
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      11-15-2012, 10:08 PM   #56
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My car literally just hit 20,000 miles last night, it's a 2008. I drive this car like a grandma for the most part, and I only had a JB4 on it for 1,000 miles. I am stock now, and this sound is more than prevalent. Never boosted more than map 1's 13psi

If the cause is truely from overboosting, that's pretty crazy that a car with this low of milage, running only a psi more boost than Dinan is having this issue
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      11-15-2012, 10:40 PM   #57
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Originally Posted by E90Company View Post
My car literally just hit 20,000 miles last night, it's a 2008. I drive this car like a grandma for the most part, and I only had a JB4 on it for 1,000 miles. I am stock now, and this sound is more than prevalent. Never boosted more than map 1's 13psi

If the cause is truely from overboosting, that's pretty crazy that a car with this low of milage, running only a psi more boost than Dinan is having this issue
Well the other problem is if "overboosting" where the cause, according to ign335i's logic, "99.9 of forum members" would have the same problem.

I wouldn't put too much into his conclusory statements.

Last edited by KaiserN54; 11-15-2012 at 10:48 PM.
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      11-16-2012, 06:56 AM   #58
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Well the other problem is if "overboosting" where the cause, according to ign335i's logic, "99.9 of forum members" would have the same problem.

I wouldn't put too much into his conclusory statements.
True, especially considering your case with the new turbos.
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      11-16-2012, 07:04 AM   #59
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I am stock and dont have that noise
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      11-16-2012, 12:14 PM   #60
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I am stock and dont have that noise
Noted.
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      11-16-2012, 12:35 PM   #61
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I am stock and dont have that noise
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      11-16-2012, 03:08 PM   #62
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I am telling you what it is based on my understanding of turbochargers and my experiences with turbocharged cars. New turbos with this sound is install error or incorrect remans. Overspeed wears the bearings out and this is the result. You don't have to believe me, but that is what it is. For people who are all stock with this sound, are you the original owner? How many miles?

This isn't a new problem, these aren't new turbos (this family of turbos has been used in different forms for ~20 years), doing a minimum amount of research will get you to the same conclusion. Or just ask Tony what he thinks causes the problem and he will tell you the same thing.
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      11-16-2012, 06:08 PM   #63
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Quote:
Originally Posted by ign335i View Post
I am telling you what it is based on my understanding of turbochargers and my experiences with turbocharged cars. New turbos with this sound is install error or incorrect remans. Overspeed wears the bearings out and this is the result. You don't have to believe me, but that is what it is. For people who are all stock with this sound, are you the original owner? How many miles?

This isn't a new problem, these aren't new turbos (this family of turbos has been used in different forms for ~20 years), doing a minimum amount of research will get you to the same conclusion. Or just ask Tony what he thinks causes the problem and he will tell you the same thing.
Is it the sound of the bearings, or the compressor making contact with the housing due to worn bearings?
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      11-16-2012, 07:31 PM   #64
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Is it the sound of the bearings, or the compressor making contact with the housing due to worn bearings?
To be honest I don't know. Either way it is a failure of the bearing/slop that causes the sound. I would defer to Tony though considering his company has been in the turbo business for almost 40 years.
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      11-16-2012, 10:41 PM   #65
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Is the noise coming from the bearings themselves or from the compressor contacting the housing due to the bearings?
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      11-17-2012, 02:50 PM   #66
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Any more thoughts?
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