Whistling sounds while accelerating

grubster · 02-12-2023, 04:31 PM

I have an 08 n54 stock with 95k miles. Can anyone help with this whistling sound. It only comes on from about 1800rpm to maybe 2700rpm.

I’m hoping it’s something simple and not a major problem.

https://youtube.com/shorts/UBomILXeGWc?feature=share

Saif2018 · 02-13-2023, 02:20 AM

Quote:

Originally Posted by grubster

I have an 08 n54 stock with 95k miles. Can anyone help with this whistling sound. It only comes on from about 1800rpm to maybe 2700rpm.

I’m hoping it’s something simple and not a major problem.

https://youtube.com/shorts/UBomILXeGWc?feature=share

Inlets loose or your turbos most likely.

Xavier716 · 02-15-2023, 09:48 AM

Turbo is going out, bearing has play, do you have oil consumption or a leak coming from turbo side?

drymite · 02-15-2023, 05:10 PM

I believe the turbos going out i drove on a loose rear inlet gasket for 2-3 months (not recommended ) but it didnt sound anything like that. it just sounded like any turbo just amplified.

Jaronbwall · 02-20-2023, 01:15 PM

grubster Are you running cat-less DPs? After installing those in my car I could hear the same thing. More siren, less whistling, but after reading posts in the forums I've determined it's the turbos. Installed and went FBO at 112k miles. Car runs fine, no smoke, hits boost target, zero misfires, but I'm original stock turbos. I'm at 117k miles now. Could be your situation.

02-12-2023, 04:31 PM	#1
grubster Private First Class 3 Rep 110 Posts Drives: 08 535i Sport, 09 GL550 Join Date: Jul 2007 Location: Chicago iTrader: (0)	Whistling sounds while accelerating I have an 08 n54 stock with 95k miles. Can anyone help with this whistling sound. It only comes on from about 1800rpm to maybe 2700rpm. I’m hoping it’s something simple and not a major problem. https://youtube.com/shorts/UBomILXeGWc?feature=share __________________ '07 335i Coupe 6MT
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02-15-2023, 09:48 AM	#3
Xavier716 New Member 0 Rep 7 Posts Drives: 07' E90 335i Join Date: Jan 2023 Location: Arizona iTrader: (0)	Turbo is going out, bearing has play, do you have oil consumption or a leak coming from turbo side? Last edited by Xavier716; 02-15-2023 at 12:24 PM..
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02-15-2023, 05:10 PM	#4
drymite Second Lieutenant 33 Rep 222 Posts Drives: 06 330i/06 323i/09 323i/07 335 Join Date: Oct 2020 Location: toronto iTrader: (0)	I believe the turbos going out i drove on a loose rear inlet gasket for 2-3 months (not recommended ) but it didnt sound anything like that. it just sounded like any turbo just amplified.
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02-20-2023, 01:15 PM	#5
Jaronbwall Driving cars and riding bikes really fast 285 Rep 1,008 Posts Drives: 2009 335i Join Date: Sep 2014 Location: Indianapolis iTrader: (0)	grubster Are you running cat-less DPs? After installing those in my car I could hear the same thing. More siren, less whistling, but after reading posts in the forums I've determined it's the turbos. Installed and went FBO at 112k miles. Car runs fine, no smoke, hits boost target, zero misfires, but I'm original stock turbos. I'm at 117k miles now. Could be your situation. __________________ 335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava Last edited by Jaronbwall; 02-20-2023 at 01:22 PM..
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