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      10-02-2019, 11:12 AM   #1
parky1215
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Wastegate rattling noise between 1500 - 1700 rpm

I started noticing wastegate rattling noise between 1500 - 1700 rpm after I installed non-resonated Remus midpipe to ZCP muffler/stock downpipe.

Here is video clip of my car showing the noise issue.


I usually notice it during slow acceleration. As soon as my rpm needle goes into those rpm range, I start to hear buzzing/rattling noise and goes away once rpm climbs beyond 1700 rpm.
I sometimes hear noise around 800 rpm in 1st gear, but this is less annoying than one that happens around 1500 rpm.

The noise only seems to happen when engine is warmed up.
Rattling noise does not come until I drive the car for few minutes.
Also, I cannot reproduce the noise when engine is not under load (eg. standstill revving).

Midpipe seems to be well installed with plenty of clearance everywhere.

Searching on the forum shows that the problem could be either turbo wastegate or exhaust valve flap.
I don't think it is exhaust valve flap as I hear noise more toward front of the car. Also exhaust valve flap rattle sounds bit different than this noise.

I have BM3 but I don't think it is tune issue since I tried several different available tunes on my profile such as stage 1, CS, GTS, CS+, and even stock tune.

It is little bit embarrassing to slowly drive around the town with this rattling noise. Otherwise, Remus midpipe really wakens up exhaust note on my car!

Last edited by parky1215; 10-22-2019 at 10:23 AM..
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      10-22-2019, 10:20 AM   #2
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Uploaded new video showing the issue.
I am going to jack up the car this weekend to see if I can discover anything on wastegate.
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      11-07-2019, 12:00 PM   #3
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You ever pinpoint issue?
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      11-07-2019, 02:01 PM   #4
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Quote:
Originally Posted by mitch32 View Post
You ever pinpoint issue?
I tried to remove some plays on external wastegate arm using some stainless steel aircraft wire, but it did not do anything. So I came to conclusion that the noise is coming from internal wastegate flap rattling inside turbo.
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      08-17-2020, 12:25 PM   #5
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I have exactly the same problem in the same conditions. Only when car in warm, during slow acceleration. Its so annoying. My exhaust is 100% stock.





Did anybody found solution?

Regards!
Chris
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      08-17-2020, 01:20 PM   #6
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I have the exact same noise , stock zcp package
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      08-17-2020, 02:01 PM   #7
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I notice the same only at very low rpm all stock with mpe optioned from the factory.

I heard that the valvetronic valve in the rear section of the exhaust can make noise too. Something about removing some washers to put more tension on the arm and eliminate vibration?

Can anyone confirm.
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      08-18-2020, 02:24 PM   #8
parky1215
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Just an update. My M3 in the video is 2015 model with 60k miles.
My girlfriend has 2017 M4 with less than 3k miles on it. I started to notice same sound (albeit quieter) coming out from her vehicle.
Her car is Competition car with everything stock.
So it looks like this noise is something that gets progressively worse as you accumulate more miles on turbo.
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      08-18-2020, 03:10 PM   #9
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Never heard this vibration coming from engine bay. Just the exhaust area during cold start and low rpm for brief second. Guess that is a different noise lol.
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      08-18-2020, 04:00 PM   #10
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Quote:
Originally Posted by parky1215 View Post
Just an update. My M3 in the video is 2015 model with 60k miles.
My girlfriend has 2017 M4 with less than 3k miles on it. I started to notice same sound (albeit quieter) coming out from her vehicle.
Her car is Competition car with everything stock.
So it looks like this noise is something that gets progressively worse as you accumulate more miles on turbo.
Do you hear this sound inside or with windows down?

I installed new ZCP exhaust and my old catalytic converters ( I had downpipe for some time ) and I hear it very cleary now but only with windows down. My car in non ZCP. Maybe its something with ZCP exhaust?
During slow speed in the city everyone around can hear this sound... Its quite embarrassing... :/

Thanks for the update
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      08-18-2020, 04:11 PM   #11
parky1215
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Quote:
Originally Posted by CeglA View Post
Do you hear this sound inside or with windows down?

I installed new ZCP exhaust and my old catalytic converters ( I had downpipe for some time ) and I hear it very cleary now but only with windows down. My car in non ZCP. Maybe its something with ZCP exhaust?
During slow speed in the city everyone around can hear this sound... Its quite embarrassing... :/

Thanks for the update
On low mileage M4, I only hear with Windows down.

On my high mileage M3, I hear it both with windows up and down.
Obviously, I hear much less on M3 with windows up, but it's loud enough that I still hear rattling noise with windows up.
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      08-19-2020, 10:39 AM   #12
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happens on mine too, exactly the same... I think its normal?
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