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      11-08-2022, 11:20 AM   #1

Drives: 2017 X4 M40i Long Beach Blue
Join Date: Jul 2022
Location: Utah

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Farting sound on deceleration

Just trying to see if what I'm experiencing is a normal sound. When letting off the throttle after a hard pull the exhaust makes a sound that is like some making a fake fart sound or blowing raspberries. Is this just normal wastegate noise? I've watched some videos of other x4s and seem to hear the sound but seems extra loud on mine. Car runs perfect and does not make any weird noises at other times just the loud fart sound when releasing the throttle after a high rpm pull.
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      11-17-2022, 02:19 PM   #2
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Drives: 335xi
Join Date: Aug 2015
Location: Basement of the Alamo

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it's normal. To me, that sounds like the burbles so coveted in the performance world. It's always on a downshift of letting go of the gas. Also, it's VERY amplified in Sport and Sport + mode.

You mentioned wastegate but what I think you might be referring to is an sound coming from the exhaust? i love the sounds. Don't get me started on the "pops" too. Together you get the lusted "burbles and pops". Go on youtube and see if this is the same thing. tons of video on how to get LOUDER burbles and pops.
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      04-16-2023, 12:26 PM   #3
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Drives: 2016 X4 M40i
Join Date: Apr 2017
Location: Los Angeles, CA

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Yes. This is normal. Itís the wastegate (aka the pop off valve) blowing out the excess boost that wasnít used.
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