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      10-02-2019, 12:12 PM   #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 11:23 AM..
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      10-22-2019, 11:20 AM   #2
parky1215
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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, 01:00 PM   #3
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You ever pinpoint issue?
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      11-07-2019, 03:01 PM   #4
parky1215
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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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