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Old 03-09-2016, 10:59 PM   #16
windwagen
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That should help a lot. Now get your wife, gf, kid, cat or use a brick to hold the throttle while you go hunting for the source of the mysterious whistle
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Old 03-09-2016, 11:14 PM   #17
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You know it's funny. Seems so simple but never thought of that! Will do!
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Old 03-09-2016, 11:32 PM   #18
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OR you could pop $150 and get a good diagnosis for what could be a simple or major issue, just sayin. And I assume he is joking above but never use a brick... if you cannot figure out why I suppose you deserve to find out why through natural selection lol
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Old 03-10-2016, 12:51 AM   #19
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Where would you go for a good diagnosis? So far, the 2 mechanics I've brought it to who exclusively do BMWs couldn't figure it out. Or at least, they didn't want to dig into the engine.
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Old 03-10-2016, 08:25 AM   #20
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Yeah... Brick is not a good idea. You might get ghe carpet dirty.... Get a CLEAN one duh!!! Or put it in a condom or something... Wait, that would make the gas pedal slippery...

Use one of those squeaky dog toys so if you dont find the whistle, at least you get the satisfaction of finding tne squeak noise....

Ha ha ... Sorry, its too early.
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Old 03-10-2016, 10:27 AM   #21
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It's clear you have not done a few things we mentioned here first, did anyone get it on the hoist and inspect the turbo, associated pipping or those two hose I mentioned?

As far as the brick goes, ya dirty floor that's what I ment...no danger in using a brick alone on the gas pedal apart from that lol
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Old 03-10-2016, 01:45 PM   #22
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No one has actually inspected the turbo, piping, etc. because they've heard the same noise in some naturally aspirated BMWs before. I went over there this morning and they showed me the noise in a 325. It was identical. Do you think that rules out the turbo or no?

Thanks as always.
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Old 03-10-2016, 04:20 PM   #23
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No idea my man, if youre happy with hearing it on a na motor and don't care, don't look.

What did they say the whistle was on the na motor? I see about 10 a week and have never heard a generic whistle on a na motor for no good reason, same as turbo motor. It isn't a built in whistle.

Don't get me wrong, a belt sound sure but an actual audible or irritating whistle suddenly appears... something is wrong. Or your mechanic just thinks bmw's come with a whistle.

Heck if it increases with RPM maybe its a pulley?

You cannot rule out things until inspected.
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Old 03-10-2016, 05:59 PM   #24
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I guess my issue is I haven't found an ambitious enough mechanic. Anyone know anyone in Toronto?
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Old 03-10-2016, 08:27 PM   #25
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I hate to say it but there is a dealer if an indy shop isn't taking you seriously. They will over charge and maybe even replace something that doesn't need done but at least they'll look lol

Try some of the guys in the paid ads section.
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Old 03-12-2016, 05:32 PM   #26
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I managed to record the noise with my phone. It's hard to hear so turn volume up!!

Please remember, although it may sound like wind noise, the pitch of the noise is determined by the engine speed, NOT the car speed.

http://initek.co/135sound.mp3
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Old 03-12-2016, 06:21 PM   #27
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That's belt/pulley /altenator ..... they all sound like that.
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Old 03-12-2016, 07:10 PM   #28
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One of the mechanics removed the belt and the noise was still there.
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Old 03-13-2016, 08:37 AM   #29
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Maybe a bird made a nest in your engine compartment....

Considering the range in pitch, it would be something mechanical. It's unlikely that a whistle caused be an air leak or some air flow oddity would more than an octave of tones like your noise.

If you hear it on the other cars, I suppose it's nothing to be concerned about. My much older 528 touring also makes a similar noise, but only above 5000 rpm and full throttle. Sounds like a gear whine.
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Old 03-13-2016, 12:00 PM   #30
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Interesting. Honestly, it's not that I'm so much concerned about it... It's just very annoying because it's all I hear while I'm driving.
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