N54Tech.com - Your Source for International Turbo BMW Racing Discussion
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DaKing's Avatar
DaKing DaKing is offline
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Default N54 turbo siren. Driving disabled turbo - 12-09-2017, 06:13 AM

A few days ago my 335i started to make noise. It sounds like turbo siren.
The noise is coming from the back of the engine under the hood.

I disconnected one of the vacuum canister hoses and the siren sound is gone.

I made a video:

https://youtu.be/xLXjud9FOy8

I read in other posts it is possible to disable the turbo's with jb4 map 8. I have jb4 g5 firmware 30-10. But the siren sound stays.

Only with disconnected hose from the vacuum canister I don't hear the sound.

On jb mobile gauge reading wgdc it says 90 and stays on 90 when driving.

Is this save to drive and not bad for the engine and turbo's?

Last edited by DaKing; 12-09-2017 at 02:24 PM..
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limitdown's Avatar
limitdown limitdown is offline
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Default 12-10-2017, 07:32 PM

That's the "siren of death" of the turbos
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arhoads335i arhoads335i is offline
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Default 12-11-2017, 05:20 AM

yes you need new turbos! you could also write a map for map 6 that has zero boost
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Default 12-11-2017, 01:47 PM

Siren of death.. hope it is something else. What other could make this sound? Cracked airpipe or turbo tube?
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SE7EN 60 SE7EN 60 is offline
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Default 12-15-2017, 07:51 PM

Hey bro. Mine always sounded like that. Purchased the car with 90k on it. It came with DCI, Full exhaust (no ***** *********) and JB4 G5. I never guessed it suppose to sound different. Boost is great and on target. I say as long as performance doesn't suck, keep driving. Boost on!


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Default 12-16-2017, 06:44 AM

Yes. But if the turbo fails it could bring damage also to the engine.

I bought an endoscope hd cam. Now I can inspect the turbo compressor wheel from the air tube inlet.

https://youtu.be/5ZgRDpQx3f4

I disconnected the hose from one of the vacuum canister. My car does not build boost now.

Last edited by DaKing; 12-16-2017 at 12:17 PM..
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THE BEAST THE BEAST is offline
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Default 12-16-2017, 11:50 AM

Thats the turbo for sure. Also in the compressor video you can see the damage causing the sound.
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THE BEAST THE BEAST is offline
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Default 12-16-2017, 11:52 AM

Bearings are done. Excessive play.
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