Welcome to the North American Subaru Impreza Owners Club Tuesday September 29, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FA Series Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 09-09-2020, 08:53 AM   #1
silverwrx19224
Scooby Newbie
 
Member#: 500246
Join Date: Apr 2019
Location: MD
Vehicle:
17 WRX
Silver

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.


Mods:
MAPerformance Stage 1+ Intake and Tune
Perrin Charge Pipe
* Registered users of the site do not see these ads.
silverwrx19224 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-09-2020, 11:32 AM   #2
WMTwrx15
Scooby Newbie
 
Member#: 501927
Join Date: May 2019
Default

Sounds like an exhaust leak

Check your exhaust manifold to cylinder head bolts

They are known for coming loose

Hope that helps
WMTwrx15 is offline   Reply With Quote
Old 09-09-2020, 12:53 PM   #3
idiosyncrisia
Scooby Newbie
 
Member#: 448185
Join Date: Jun 2016
Chapter/Region: Tri-State
Location: Essex County, New Jersey
Vehicle:
2016 WRX
DGM

Default

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!
idiosyncrisia is offline   Reply With Quote
Old 09-09-2020, 01:34 PM   #4
silverwrx19224
Scooby Newbie
 
Member#: 500246
Join Date: Apr 2019
Location: MD
Vehicle:
17 WRX
Silver

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?
silverwrx19224 is offline   Reply With Quote
Old 09-16-2020, 07:51 PM   #5
silverwrx19224
Scooby Newbie
 
Member#: 500246
Join Date: Apr 2019
Location: MD
Vehicle:
17 WRX
Silver

Default

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. Iím pretty defeated right now honestly because I think it took me about 8-10 hours. The bolts wouldnít 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?
silverwrx19224 is offline   Reply With Quote
Old 09-16-2020, 08:02 PM   #6
WMTwrx15
Scooby Newbie
 
Member#: 501927
Join Date: May 2019
Default

Check the bolts for the header to the cylinder head
WMTwrx15 is offline   Reply With Quote
Old 09-16-2020, 08:15 PM   #7
silverwrx19224
Scooby Newbie
 
Member#: 500246
Join Date: Apr 2019
Location: MD
Vehicle:
17 WRX
Silver

Default

Quote:
Originally Posted by WMTwrx15 View Post
Check the bolts for the header to the cylinder head


I sprayed that area and didnít see a leak
silverwrx19224 is offline   Reply With Quote
Old 09-18-2020, 11:18 AM   #8
silverwrx19224
Scooby Newbie
 
Member#: 500246
Join Date: Apr 2019
Location: MD
Vehicle:
17 WRX
Silver

Default

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.

silverwrx19224 is offline   Reply With Quote
Old 09-18-2020, 12:48 PM   #9
killadawg
Scooby Specialist
 
Member#: 424203
Join Date: Jun 2015
Chapter/Region: NWIC
Location: Mountains WA
Vehicle:
2016 WRX stg 4 Rally
STI Drivetrain GM

Default

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...
killadawg is offline   Reply With Quote
Old 09-18-2020, 12:55 PM   #10
standardtranny
Scooby Specialist
 
Member#: 450713
Join Date: Jul 2016
Chapter/Region: Tri-State
Location: Super bowl LII champs
Vehicle:
2017 WRX Stage 3ish
world rally blue

Default

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
standardtranny is offline   Reply With Quote
Old 09-18-2020, 01:09 PM   #11
killadawg
Scooby Specialist
 
Member#: 424203
Join Date: Jun 2015
Chapter/Region: NWIC
Location: Mountains WA
Vehicle:
2016 WRX stg 4 Rally
STI Drivetrain GM

Default

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!
killadawg is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 06:34 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.