Welcome to the North American Subaru Impreza Owners Club Friday July 11, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L 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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-13-2013, 09:11 PM   #1
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default Strange whine after 5lbs of boost???

I have a 2011 wrx stage 2 with just cobb software (good data log numbers) and hks catless down pipe. today i was driving my car and after 5lbs of boost i heard this terrible whining sound almost like a supercharger every time i hit more than 5lbs of boost it continues to make the same noise and im afraid to try and make higher boost. the car only has 9000 miles on it so im a bit surprised as to why it would happen so soon. ive researched this but ive found a bunch of different things so i dont know what to really follow a lead on before i start taking things apart, any info helps thanks.
* Registered users of the site do not see these ads.
orbs45 is offline   Reply With Quote
Old 01-13-2013, 09:41 PM   #2
drewvdw
Scooby Guru
 
Member#: 255776
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Laramie, WY
Vehicle:
2010 LR WRX
MPS powered.

Default

My bet is it's your factory BPV failing. Not too surprising.
drewvdw is offline   Reply With Quote
Old 01-14-2013, 02:15 AM   #3
RoadKillDMD
Scooby Specialist
 
Member#: 284792
Join Date: Jun 2011
Chapter/Region: RMIC
Location: Vanilla Valley, CO
Vehicle:
2011 STI
Plasma Blue Pearl

Default

Either ^^ that, or those pesky TB-TMIC coupler end caps. Both common issues with running higher boost on the stock setup.
RoadKillDMD is online now   Reply With Quote
Old 01-14-2013, 07:14 AM   #4
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by drewvdw View Post
My bet is it's your factory BPV failing. Not too surprising.
What's the best way to test to see if it's the BPV? The other leads I found were turbo inlet seal and the turbo whine of death, what do you think?
orbs45 is offline   Reply With Quote
Old 01-14-2013, 07:16 AM   #5
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by RoadKillDMD View Post
Either ^^ that, or those pesky TB-TMIC coupler end caps. Both common issues with running higher boost on the stock setup.
I have to check that out, I really don't wanna flash this thing back to stock and bring
It to the dealership because it's still under warranty I'd rather fix it at my friends shop if I can.
orbs45 is offline   Reply With Quote
Old 01-14-2013, 07:27 AM   #6
subieguy87
Scooby Specialist
 
Member#: 153412
Join Date: Jul 2007
Chapter/Region: MWSOC
Location: Springfield,il
Vehicle:
1998 Impreza wrxRS
Black

Default

Quote:
Originally Posted by orbs45 View Post

I have to check that out, I really don't wanna flash this thing back to stock and bring
It to the dealership because it's still under warranty...
That's just a bad idea anyway.


Next thread: dealership sucks because they voided my warranty!
subieguy87 is offline   Reply With Quote
Old 01-14-2013, 08:20 AM   #7
cineris
Scooby Newbie
 
Member#: 263329
Join Date: Nov 2010
Chapter/Region: MWSOC
Location: Columbus, OH
Vehicle:
2011 Impreza WRX
DGM

Default

Upgrade your bpv? I got rid of mine a while ago for a turbosmart. Also ditched the stock tmic. Is the sound consistent all the way through or does it taper off towards redline?
I've got a few plausible theories.
1. As others have said, you have a boost leak somewhere (bpv, tmic, some vacuum line somewhere)
2. If it tapers off towards redline and sounds like a screeching banshee, its probably your wastage taking care of higher than stock boost numbers.
3. Our model WRXs are notorious for crappy intercooler hoses. Throttle body to IC hose kinks and makes a stupid whooshing sound like a vacuum cleaner.

Hope that helps a bit.

Edit: I just noticed Dr. Roadkilldmd already stated number 3.
cineris is offline   Reply With Quote
Old 01-14-2013, 12:00 PM   #8
1wrxtra
Scooby Specialist
 
Member#: 316364
Join Date: Apr 2012
Chapter/Region: International
Vehicle:
2012 WRX

Default

Quote:
Originally Posted by cineris View Post
Upgrade your bpv? I got rid of mine a while ago for a turbosmart. Also ditched the stock tmic. Is the sound consistent all the way through or does it taper off towards redline?
I've got a few plausible theories.
1. As others have said, you have a boost leak somewhere (bpv, tmic, some vacuum line somewhere)
2. If it tapers off towards redline and sounds like a screeching banshee, its probably your wastage taking care of higher than stock boost numbers.
3. Our model WRXs are notorious for crappy intercooler hoses. Throttle body to IC hose kinks and makes a stupid whooshing sound like a vacuum cleaner.

Hope that helps a bit.

Edit: I just noticed Dr. Roadkilldmd already stated number 3.
This guy hit the most probable causes on the head. Start there and let us know what you find.
1wrxtra is offline   Reply With Quote
Old 01-14-2013, 01:36 PM   #9
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by 1wrxtra View Post

This guy hit the most probable causes on the head. Start there and let us know what you find.
Alright thanks
orbs45 is offline   Reply With Quote
Old 01-14-2013, 01:37 PM   #10
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by cineris View Post
Upgrade your bpv? I got rid of mine a while ago for a turbosmart. Also ditched the stock tmic. Is the sound consistent all the way through or does it taper off towards redline?
I've got a few plausible theories.
1. As others have said, you have a boost leak somewhere (bpv, tmic, some vacuum line somewhere)
2. If it tapers off towards redline and sounds like a screeching banshee, its probably your wastage taking care of higher than stock boost numbers.
3. Our model WRXs are notorious for crappy intercooler hoses. Throttle body to IC hose kinks and makes a stupid whooshing sound like a vacuum cleaner.

Hope that helps a bit.

Edit: I just noticed Dr. Roadkilldmd already stated number 3.
Alright thanks for the input, much appreciated
orbs45 is offline   Reply With Quote
Old 01-14-2013, 03:30 PM   #11
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by cineris View Post
Upgrade your bpv? I got rid of mine a while ago for a turbosmart. Also ditched the stock tmic. Is the sound consistent all the way through or does it taper off towards redline?
I've got a few plausible theories.
1. As others have said, you have a boost leak somewhere (bpv, tmic, some vacuum line somewhere)
2. If it tapers off towards redline and sounds like a screeching banshee, its probably your wastage taking care of higher than stock boost numbers.
3. Our model WRXs are notorious for crappy intercooler hoses. Throttle body to IC hose kinks and makes a stupid whooshing sound like a vacuum cleaner.

Hope that helps a bit.

Edit: I just noticed Dr. Roadkilldmd already stated number 3.
I took the car for a spin with my mechanic and the car is continuing the noise until red line and is maxing out at 16lbs of boost instead of the 18.5lbs I was maxing out at..so it's holding boost to a point but not the full boost that it was. I'm thinking a boost leak or the BPV went.
orbs45 is offline   Reply With Quote
Old 01-14-2013, 03:44 PM   #12
nate_fisher
Scooby Specialist
 
Member#: 270482
Join Date: Jan 2011
Location: albany ny
Vehicle:
2011 forester xt
corn fed td06 20g 8cm

Default

Throttle body to tmic hose or one of the vac lines on the intake manifold.
nate_fisher is offline   Reply With Quote
Old 01-15-2013, 03:00 PM   #13
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Found the culprit, it was the lower in lC hose rubber gasket which sits between the hose and the throttle body and the clamp wraps around it..the problem was that piece ripped luckily only a 7 dollar fix.
orbs45 is offline   Reply With Quote
Old 01-15-2013, 03:01 PM   #14
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by nate_fisher View Post
Throttle body to tmic hose or one of the vac lines on the intake manifold.
You were right also IC hose
orbs45 is offline   Reply With Quote
Old 01-15-2013, 03:45 PM   #15
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2012 Forester 2.5X
2002 WRX Sedan

Default

Quote:
Originally Posted by orbs45 View Post
Found the culprit, it was the lower in lC hose rubber gasket which sits between the hose and the throttle body and the clamp wraps around it..the problem was that piece ripped luckily only a 7 dollar fix.
Do NOT install a new rubber piece!!!! There are many, many posts about this. There have been at least 3-4 posts in this very section of the forum on this topic in the last week!

The rubber end caps are a poor design and they will fail again. Remove them from BOTH ends of that hose and then reinstall. You will never have another issue again. My car runs double the stock boost and doesn't have a problem.
xluben is online now   Reply With Quote
Old 01-15-2013, 04:24 PM   #16
nate_fisher
Scooby Specialist
 
Member#: 270482
Join Date: Jan 2011
Location: albany ny
Vehicle:
2011 forester xt
corn fed td06 20g 8cm

Default

^^^This take them both off asap.
nate_fisher is offline   Reply With Quote
Old 01-17-2013, 12:23 AM   #17
orbs45
Scooby Newbie
 
Member#: 300835
Join Date: Nov 2011
Location: Strong Island
Vehicle:
2011 WRX
WRB premium

Default

Quote:
Originally Posted by xluben View Post
Do NOT install a new rubber piece!!!! There are many, many posts about this. There have been at least 3-4 posts in this very section of the forum on this topic in the last week!

The rubber end caps are a poor design and they will fail again. Remove them from BOTH ends of that hose and then reinstall. You will never have another issue again. My car runs double the stock boost and doesn't have a problem.
I haven't installed it yet but Ill test it on Saturday without the end caps..I noticed the blow by as well hopefully they'll be less moisture from the oil when I take the end caps off
orbs45 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 04:31 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.