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Old 09-09-2020, 08:53 AM   #1
silverwrx19224
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Default Compressor surge? Wastegate flutter? Something else? WOT ticking

Over the past week I have been hearing a fluttering noise while WOT and under boost only 3-6k rpm. I didn't know where to look so I thought might as well inspect every aftermarket part I put on.

The other day I took all of parts off and inspecting any silicone for rips or tears and made sure all clamps were tight.

The noise was still there.

The video below is a short 3-6K pull in third gear. Any idea what this noise is and what can be done? I've read a lot of posts and am not sure what is causing it. One dude had a tear in his turbo inlet hose and the other completely replaced his turbo.

You can hear the fluttering noise like a leaf or playing card flapping.


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Old 09-09-2020, 11:32 AM   #2
WMTwrx15
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Sounds like an exhaust leak

Check your exhaust manifold to cylinder head bolts

They are known for coming loose

Hope that helps
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Old 09-09-2020, 12:53 PM   #3
idiosyncrisia
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Yeah, I agree with exhaust leak. They can sound pretty damn raspy when they happen. I developed one at a track event and it was louder than what you have, but a bit similar.

Pretty easy to check for too!
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Old 09-09-2020, 01:34 PM   #4
silverwrx19224
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Default

Quote:
Originally Posted by WMTwrx15 View Post
Sounds like an exhaust leak

Check your exhaust manifold to cylinder head bolts

They are known for coming loose

Hope that helps
Quote:
Originally Posted by idiosyncrisia View Post
Yeah, I agree with exhaust leak. They can sound pretty damn raspy when they happen. I developed one at a track event and it was louder than what you have, but a bit similar.

Pretty easy to check for too!
Sounds like that might be it. I just saw another FA youtube video with a similar sound after searching exhaust leak.

I am going to inspect the bolts and buy some new gaskets and see if that works.

I have a magnaflow competition catback that I am pretty sure I can no longer get gaskets. Are there any products that can be used for sealing exhaust leaks?
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Old 09-16-2020, 07:51 PM   #5
silverwrx19224
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You both were right but the noise is still there. Did a suds test with a leaf blower and soap.

Proof of exhaust leak (sorry about the ****ty photos):



Cracked gasket


Large bubbles by the down pipe



Seems like I fixed an issue but not the one I was trying to resolve. I’m pretty defeated right now honestly because I think it took me about 8-10 hours. The bolts wouldn’t come off without an extractor and a stud came loose. I had to go to subaru parts department three times during this ****ty job.

Anyone have any idea where this sound could be?
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Old 09-16-2020, 08:02 PM   #6
WMTwrx15
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Check the bolts for the header to the cylinder head
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Old 09-16-2020, 08:15 PM   #7
silverwrx19224
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Quote:
Originally Posted by WMTwrx15 View Post
Check the bolts for the header to the cylinder head


I sprayed that area and didn’t see a leak
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Old 09-18-2020, 11:18 AM   #8
silverwrx19224
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Quote:
Originally Posted by WMTwrx15 View Post
Check the bolts for the header to the cylinder head


You were right, I was missing a bolt.

Took 5 minutes.

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Old 09-18-2020, 12:48 PM   #9
killadawg
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OMG, I've battled this so many times.. I'm running headers and have replaced my bolts so many times it sucks!! lock washers, special bolts etc.. I finally got it.. for now...
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Old 09-18-2020, 12:55 PM   #10
standardtranny
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http://forums.nasioc.com/forums/show...20some%20cars.

theres a recall for that, my 17 wrx wasn't affected but it looks like yours was
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Old 09-18-2020, 01:09 PM   #11
killadawg
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Quote:
Originally Posted by standardtranny View Post
http://forums.nasioc.com/forums/show...20some%20cars.

theres a recall for that, my 17 wrx wasn't affected but it looks like yours was
Yeah Dealership refuses to touch my car unless I remove the non-stock items.. LMAO.. I have to remove everything under the hood!! Headers must be removed to tighten the exhaust manifold bolts (to an exhaust manifold I don't have anymore..)

Yeah I saw this bulletin update, yet this is my 2nd engine and 2nd set of headers and 3rd turbo... I don't qualify for free work. lol Pay to Play, gotta tighten my own bolts!
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