Welcome to the North American Subaru Impreza Owners Club Thursday July 31, 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 2.0L 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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 03-20-2007, 07:19 PM   #1
panman91
Scooby Newbie
 
Member#: 37524
Join Date: May 2003
Location: Memphis, TN
Vehicle:
2002 WRX
Platinum Silver Metallic

Question NEED HELP!! Weird sound from turbo when letting off gas. VIDEO INCLUDED

Just for some background my car is a 2002 wrx with tuboxs TBE and a PDE uppipe. listen to this clip and tell what you guys think this could be. I don't think its the heatshield because when i hold down the heatshield the sound still resonates.

Click Here for Video
* Registered users of the site do not see these ads.
panman91 is offline   Reply With Quote
Old 03-20-2007, 07:39 PM   #2
thosepeople
Scooby Newbie
 
Member#: 133104
Join Date: Nov 2006
Location: Eldon,MO
Vehicle:
2002 silver WRX
oh yes 4:11 gears

Default

It sounds to me like you have some serious shaft play or your bearings are gone and you probably need to replace your turbo or atleast have it rebuilt.
I am not an expert, but that is my 2 cents.
thosepeople is offline   Reply With Quote
Old 03-20-2007, 08:22 PM   #3
Cation
Scooby Specialist
 
Member#: 88779
Join Date: Jun 2005
Chapter/Region: South East
Location: TN
Vehicle:
00 E55 AMG
Black

Default

That sounds like a heat shield rattle. Do you still have the heat shield installed under the turbo? The one that used to bolt to part of the DP near your Up Pipe? Maybe it is rattling on something. Doesn't sound internal to me, but I've never heard what a turbo sounds like with excessive shaft play or bad bearings. From what I've read though excessive shaft play results in a whistling sound from the turbo not a rattle like you have. Have you noticed any loss in power/performance or are you just getting that sound? If you are getting a loss in power/performance then I would venture to guess that your turbo is going out. Get under the car and have a listen, maybe you can isolate it there. Good luck and keep us posted with what you find!
Cation is offline   Reply With Quote
Old 03-27-2007, 04:18 PM   #4
panman91
Scooby Newbie
 
Member#: 37524
Join Date: May 2003
Location: Memphis, TN
Vehicle:
2002 WRX
Platinum Silver Metallic

Default

anyone else want to shed some light on this.

I took it to the dealer and they said they couldnt do anything unless they took it apart. they its not a heatshield rattle but possible something inside between the turbo and downpipe. maybe the gasket or the shaft play with the fins on the turbo. what do you guys think?
panman91 is offline   Reply With Quote
Old 03-27-2007, 07:53 PM   #5
PaulRex
Scooby Guru
 
Member#: 12454
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: Vermont
Vehicle:
10 Toyota Taco
K8 SV650SF

Default

just take the heatshield off and drive it to narrow the variables if you feel it may be that. if your turbo is broken well thats an easy fix just get a new one! i wouldnt spend the money to buy a new stock one through the dealer though..
PaulRex is offline   Reply With Quote
Old 03-27-2007, 08:43 PM   #6
deebee8
Scooby Specialist
 
Member#: 85437
Join Date: Apr 2005
Chapter/Region: BAIC
Location: Bay Area, California
Vehicle:
2002 Wrx
Land of the dead

Default

it sounds like the compresser wheel is slapping the hell out of the housing =(

how does it run under boost?
deebee8 is offline   Reply With Quote
Old 03-27-2007, 09:45 PM   #7
boozy04
Scooby Specialist
 
Member#: 87034
Join Date: May 2005
Chapter/Region: MWSOC
Location: NW, Indiana
Vehicle:
08 Stg2 9.5's 275s
SSM

Default

wow that sounds awful... i would agree with the need of a new turbo.
boozy04 is offline   Reply With Quote
Old 03-27-2007, 09:54 PM   #8
Force
Scooby Specialist
 
Member#: 123515
Join Date: Aug 2006
Location: park ridge, Illinois
Vehicle:
2005 vette c6 z51
LeMans Blue

Default

Yes, like the others have said:

If not the heat shield....

bad bearings--->excessive shaft-play--->turbine and/or compressor blades scraping against the housing.
Force is offline   Reply With Quote
Old 03-27-2007, 10:21 PM   #9
Luckie8
Scooby Specialist
 
Member#: 105240
Join Date: Jan 2006
Chapter/Region: Tri-State
Location: Dirty Jerzee
Vehicle:
04 Wingless STi
mk2 vr6

Default

yeah.. I highly doubt that's the heatshield making that noise. But just to be sure I would take that shield off and drive without it to see what happens.
Gluck.
Luckie8 is offline   Reply With Quote
Old 03-28-2007, 10:15 AM   #10
Turn in Concepts
NASIOC Vendor
 
Member#: 93646
Join Date: Aug 2005
Chapter/Region: MWSOC
Vehicle:
Many Track Records
Let us help you go fast!

Default

It doesn't really sound like the compressor is hitting the housing. I have had turbos blow on me in the past and they have never made that noise. I would take your downpipe off and see if you have a lot of shaft play on the turbo. That will tell you right off if that is the problem.
tony
Turn in Concepts is offline   Reply With Quote
Old 03-28-2007, 10:21 AM   #11
Force
Scooby Specialist
 
Member#: 123515
Join Date: Aug 2006
Location: park ridge, Illinois
Vehicle:
2005 vette c6 z51
LeMans Blue

Default

^^Yeah, same here. Usually, the sound of the blades hitting the housing will sound more like an electric jigsaw cutting through plastic or something like that. (At least thats what my old 16G sounded like when it happened)
His video doesn't sound too much like that, but ya never know.
Force is offline   Reply With Quote
Old 03-28-2007, 12:54 PM   #12
Bbasso
Scooby Specialist
 
Member#: 66235
Join Date: Jul 2004
Chapter/Region: Tri-State
Location: South Carolina !
Vehicle:
2005 WRX
Silver

Default

Dammmmmmmmmm that sounds bad!
Sorry I have nothing usefull to add :|
Bbasso is offline   Reply With Quote
Old 03-28-2007, 03:06 PM   #13
illsuby
Scooby Newbie
 
Member#: 72635
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: Libertyville
Vehicle:
03 WRX
Black

Wink

I had my heatshield make a VERY VERY similar noise. I also did the same thing, put some gloves on, put pressure on the shield and had someone work the throttle, still rattled. The dealership told me it was "okay" to run without the heatshield, but it woudl be recommended to find an aftermarket. Their reason for the sound was that some parts that bold to the stock up pipe, and those were missing when I swapped it out for my Vishnu.

My easy answer for you is take the heat shield off, it's only a few bolts. Drive it, if its still happening, it's not the heat shield. Cobb makes a dandy replacement for about $50.
illsuby is offline   Reply With Quote
Old 03-28-2007, 03:10 PM   #14
amukaoen
Scooby Specialist
 
Member#: 62595
Join Date: May 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
04 WRX Cobb S2
World Rally Blue

Default

Quote:
Originally Posted by illsuby View Post
I had my heatshield make a VERY VERY similar noise. I also did the same thing, put some gloves on, put pressure on the shield and had someone work the throttle, still rattled. The dealership told me it was "okay" to run without the heatshield, but it woudl be recommended to find an aftermarket. Their reason for the sound was that some parts that bold to the stock up pipe, and those were missing when I swapped it out for my Vishnu.

My easy answer for you is take the heat shield off, it's only a few bolts. Drive it, if its still happening, it's not the heat shield. Cobb makes a dandy replacement for about $50.
So in your case it was the heatsheild that made that noise?
amukaoen is offline   Reply With Quote
Old 03-28-2007, 03:23 PM   #15
illsuby
Scooby Newbie
 
Member#: 72635
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: Libertyville
Vehicle:
03 WRX
Black

Default

Yes it was. I took it to two dealers, my personal mechanic, and had a few gearheads I know take a peek, and they couldn't find it. The second time around, the dealer I bought it from took off all expendable heat shields, the rattle stopped, and they just added them back one by one until it started again, and it was the turbo heatshield. I haven't replaced it yet, and it's been seemingly fine. Been about 8 months now.
illsuby is offline   Reply With Quote
Old 03-28-2007, 03:50 PM   #16
illsuby
Scooby Newbie
 
Member#: 72635
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: Libertyville
Vehicle:
03 WRX
Black

Default

Just to verify, it happens on decel only, between 3,500ish and 2,200ish RPMs? I ask because those were the circumstances of my rattle. It may not have been that whole band, but it was definitely always in there.
illsuby is offline   Reply With Quote
Old 03-28-2007, 04:40 PM   #17
panman91
Scooby Newbie
 
Member#: 37524
Join Date: May 2003
Location: Memphis, TN
Vehicle:
2002 WRX
Platinum Silver Metallic

Default

Quote:
Originally Posted by illsuby View Post
Just to verify, it happens on decel only, between 3,500ish and 2,200ish RPMs? I ask because those were the circumstances of my rattle. It may not have been that whole band, but it was definitely always in there.
Yes. only when i let off the throttle.
panman91 is offline   Reply With Quote
Old 03-28-2007, 04:47 PM   #18
illsuby
Scooby Newbie
 
Member#: 72635
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: Libertyville
Vehicle:
03 WRX
Black

Default

Yeah, my vote then is the heatshield. Three bolts I think and it's off. Please post after you try it without the shield, I'm curious to see the results.
illsuby is offline   Reply With Quote
Old 03-28-2007, 05:59 PM   #19
panman91
Scooby Newbie
 
Member#: 37524
Join Date: May 2003
Location: Memphis, TN
Vehicle:
2002 WRX
Platinum Silver Metallic

Default

Quote:
Originally Posted by illsuby View Post
Yeah, my vote then is the heatshield. Three bolts I think and it's off. Please post after you try it without the shield, I'm curious to see the results.

It is sooo not the heatshield....took it off and it does the same exact thing. i'm leaning towards shaft play in the turbo. i noticed while driving that it only makes noise once vacuum pressure based off the stock turbo gauge is in the 4 o'clock position. if i just give it a little gas until the gauge is at the 6 o'clock position the noise disappears. while driving, medium to light throttle you can hear the rattle coming in and out based on how much the turbo is spinning. i have been driving like this for a while now.

I was gonna ask what is normal vacuum pressure supposed to be when you let off throttle?
panman91 is offline   Reply With Quote
Old 03-28-2007, 06:09 PM   #20
illsuby
Scooby Newbie
 
Member#: 72635
Join Date: Oct 2004
Chapter/Region: MWSOC
Location: Libertyville
Vehicle:
03 WRX
Black

Default

No prob on the heatshield, it was worth a shot. My stock boost guage will have the vaccum pressure at about (what would be) -.4 (about 6:30 or 7 oclock on the guage), which i think converts to about -6 PSI, but I may be way off on the math. n00b(ish) at work here. I can't say I've seen my boost guage get to the 4 oclock position...i think that's really bad.
illsuby is offline   Reply With Quote
Old 03-28-2007, 07:09 PM   #21
Gethin
Scooby Specialist
 
Member#: 2998
Join Date: Nov 2000
Chapter/Region: VIC
Location: BC
Vehicle:
2002 WRX
WRB

Default

check the flapper, is your WG working properly?
Gethin is offline   Reply With Quote
Old 03-28-2007, 09:40 PM   #22
panman91
Scooby Newbie
 
Member#: 37524
Join Date: May 2003
Location: Memphis, TN
Vehicle:
2002 WRX
Platinum Silver Metallic

Default

Quote:
Originally Posted by Gethin View Post
check the flapper, is your WG working properly?
how do you check that?
panman91 is offline   Reply With Quote
Old 03-29-2007, 05:06 PM   #23
cspangler6
Scooby Newbie
 
Member#: 122803
Join Date: Aug 2006
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2004 Subaru
Blue

Default

If you need a new turbo look on ebay. you can find one for like 100 bucks or less and its probably an easy install ( or at least cheap to get installed)
cspangler6 is offline   Reply With Quote
Old 03-29-2007, 07:22 PM   #24
awdguy
Scooby Newbie
 
Member#: 59101
Join Date: Apr 2004
Location: michigan
Vehicle:
2004 wrx
white

Default

Let just say......It's F@#k up.
awdguy is offline   Reply With Quote
Old 03-29-2007, 07:42 PM   #25
Assassin4457
Scooby Specialist
 
Member#: 96773
Join Date: Sep 2005
Chapter/Region: E. Canada
Location: GTA, Ontario Canada.
Vehicle:
04 WRX, RIP GC8
Black

Default

*Withdrew my post*
Assassin4457 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Car shakes violently when letting off gas at 5k rpms? Help... ImportVenom Transmission (AT/MT) & Driveline 9 10-21-2011 06:16 AM
Smoke out bov when let off gas????? EklipzGSXkid Factory 2.5L Turbo Powertrain 23 08-05-2008 12:38 AM
Weird sound from turbo? Eyefixstuff Factory 2.5L Turbo Powertrain 2 08-30-2007 07:00 PM
Metallic noise when letting off gas _JsWRX Factory 2.5L Turbo Powertrain 4 01-16-2007 01:20 PM
weird sound from turbo area under boost OneArmedScissor Factory 2.0L Turbo Powertrain 2 07-02-2003 03:29 AM


All times are GMT -4. The time now is 01:25 AM.


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.