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      02-05-2014, 06:45 PM   #1
BWT
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M135i - Whistling Sound on Acceleration

I can hear a whistling sound on on acceleration with the windows up. Do guys get this sound as well or know what this could be?

I have searched and other M135i owners have said that the turbo can be heard. I have had other turbo cars (not BMW's) and have not heard a similar sound with the windows up.

I have not taken the car past 4.5k RPM as car is still under the running in period.

Thanks
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      02-05-2014, 09:04 PM   #2
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Can't recall mine whistling. It's manual, 15000km and I usually drive with stereo off and windows up in town. Sometimes does a bit of pshhh or whsshhh.
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      02-06-2014, 03:20 AM   #3
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it happens on mine too, can't work out where its coming from but i know its around the mirror area.
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      02-06-2014, 09:22 AM   #4
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same here, been wondering what it is
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      02-06-2014, 09:42 AM   #5
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Turbo spooling up.Mine does it more in cooler weather.
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      02-06-2014, 04:14 PM   #6
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With the added intake roar of my K&N filter and the bark of my M Performance exhaust I don't hear that spooling whine very often. I do hear the delicious overrun burble and occasional turbo pressure dump valve from time to time though. Love 'em.
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      02-08-2014, 08:05 PM   #7
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As others have said it's just the turbo whistling and chirping, they all do it as far as I know. (Mine does).
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