2008 BMW e90 Unknown noise w/ video please help

[griz31]

All,

Can you help me identify this noise? It sounds like it could be a rear differential issue from what I have read. It is a whirring/whistling type noise that only seems to occur at 50/60 mph in 4-5-6th gear. It sounds like it is originating from the rear passenger side. 2008 m3 e90 6MT. Please help! Thanks

[badbimmer]

Is there a jet overhead?

[griz31]

Originally Posted by badbimmer

Is there a jet overhead?

Lol - Just highway driving noise. I dont know how to get a better clip of the noise...

[Candide13]

Originally Posted by griz31

Lol - Just highway driving noise. I dont know how to get a better clip of the noise...

I have a diff whirring noise at 3K rpm under partial/light load, typical for cruising, which sounds similar, best as I can tell.. noise has been there for 3 years without change.

[///M Power-Belgium]

I can hear it clearly , it's a whine noise and it makes me think on the whine noise of the Harrop SC .
But I have no idea of what it could be

[griz31]

Thanks all. The noise was hard to capture in the video (cell phone) and sounds much more invasive in person. After researching rear differential whirring noises - I found some better quality videos that seemed to be the exact noise I am experiencing. Car is currently at the shop for a look - Ill post updates when I get them.

[bimmerfrk]

rod bearings, I hate when this kind of thing happens.

[griz31]

Originally Posted by bimmerfrk

rod bearings, I hate when this kind of thing happens.

Not sure I understand your post. Are you saying that the noise is coming from rod bearings? Theres no engine knock associated with the noise.

[Candide13]

Originally Posted by griz31

Not sure I understand your post. Are you saying that the noise is coming from rod bearings? Theres no engine knock associated with the noise.

He was just reheating age-old porridge...

[Nickdm3]

could be the infamous 2008 flywheel/ clutch? kinda hard to hear.

[griz31]

Update

Got the car back and they said it was "normal". It makes a sognificantly different sound from 60-80 mph which just can not be normal. They are bringing it to a BMW service center for a second opinion. If this is deemed "normal" im not sure I can deal with it and may look into an S4

[///M Power-Belgium]

Originally Posted by griz31

Update

Got the car back and they said it was "normal". It makes a sognificantly different sound from 60-80 mph which just can not be normal. They are bringing it to a BMW service center for a second opinion. If this is deemed "normal" im not sure I can deal with it and may look into an S4

We/I don't have such a noise , and that's why your noise is "NOT" normal !
Such a noise would drive me crazy , and I really hope the BMW service center for a second opinion can find the cause of the noise .

Please keep us posted , and thanks for the update .

[griz31]

I never ended up making it to the next service appointment. I just felt there was too much wrong with the car for a "new" purchase. I realized I was trying to force myself into an m3, and this just wasn't the right one.

Ended up getting myself into a 235i and the thing is incredible

[Biggus Dickus]

Probably regular diff or transmission noise. Its pretty standard on this car. List to the whine of a straight cut transmission in a race car and this will sound like nothing.

[griz31]

Originally Posted by Biggus Dickus

Probably regular diff or transmission noise. Its pretty standard on this car. List to the whine of a straight cut transmission in a race car and this will sound like nothing.

I had a hard time thinking it was normal since the noise would change with throttle response in the 60-80mph range. Even if it was normal, I figure I couldn't tolerate that over the long term. Thanks for the input!