Welcome to the North American Subaru Impreza Owners Club Thursday September 18, 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 10-04-2006, 02:01 AM   #1
AnorexicSTI
Scooby Specialist
 
Member#: 85227
Join Date: Apr 2005
Chapter/Region: VIC
Location: Vancouver, BC, Canada
Vehicle:
2005 STI
Silver

Default 05 STI - COBB uppipe install - I can't stop the leaking

I bought new gaskets for the uppipe to turbo and uppipe to manifold.

I reused the manifold to block gasket, and the manifold to crosspipe gasket. Before somebody flames me on that, my theory is that if the parts on both sides of the gasket are not being replaced, reusing the gasket should be fine since each part on either side has taken a "set" into the gasket. I've also read of numerous uppipe installs that went fine with replacing only the 2 uppipe gaskets and reusing the other 2. I'm also pretty certain it is not leaking in the 2 manifold gaskets. The "smell" test indicated the leaks are from the uppipe.

This is what I did:

1. Finger tightened everything (and I mean really loosely... I could still shake everything around a few mm).
1. Torqued manifold to crosspipe 15, 20, 25, then 30 ftlbs in steps.
2. Torqued manifold to uppipe 15, 20, 25, then 30 ftlbs.
3. Torqued manifold to block 15, 20, 25, then 30 ftlbs.
4. Torqued uppipe to turbo (3 bolts only) 15, 20, 25, then 30 ftlbs.
5. Torqued uppipe to support brackets (2 bolts) 20, then 30 ftlbs.

Reason I did the 3 bolts separately is because those are the ones where the gasket are. Once those make the seal, then the 2 support bracket bolts were tightened. If I had tightened the 2 support bracket bolts, it might have affected the seal on the gasket.

I am still getting the hissing sound... it is not nearly as bad as before, but it is still there. This is the most frustrating thing ever. Any suggestions?
* Registered users of the site do not see these ads.
AnorexicSTI is offline   Reply With Quote
Old 10-04-2006, 05:09 AM   #2
NewSTI
Scooby Specialist
 
Member#: 104420
Join Date: Jan 2006
Chapter/Region: SCIC
Location: Orange
Vehicle:
05 GarageTuningSTI
BLK/Gold 519hp@23psi

Default

are you sure you are still leaking ??? or probably drive it a bit and let the new gaskets burn. If still leaking after that, you just have to tighten it more or replace gaskets..
NewSTI is offline   Reply With Quote
Old 10-04-2006, 07:50 AM   #3
conker69
Scooby Specialist
 
Member#: 59692
Join Date: Apr 2004
Location: Cincinnati
Vehicle:
2005 Impreza WRX STi
WRB-Gold

Default

Put the stock uppipe back on or use an aftermarket pipe with a flex joint. Uppipes without a flex joint tend to leak. The stock pipe has a flex joint...that should be your first clue.
conker69 is offline   Reply With Quote
Old 10-04-2006, 10:14 AM   #4
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

You first have to figure out where it is leaking. Look for black marks around the joints, or get under the car when it is running to listen. From there I would get some high temp copper rtv and go to town on the leaking joint. That should seal it up rather well.

FWIW, I have pulled my UP out of my wrx 2 or 3 times, pulled my manifold at least 5 times and had my turbo(s) off a few times and have yet to replace any gaskets. I am not saying this is ideal and for some would cause problems, but I think in this case you are ok. The last time I had a leak, it was from the driver's side manifold to crosspipe joint. I had the two bolts torqued down to 35lbft, but it was still leaking form there. One of the bolts was somewhat crossthreaded somehow and was not tightening down enough to seal. I cranked it down temprarily until I got a new bolt and it sealed fine.
Turn in Concepts 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
Can't stop the alternator whine, guru help anthony_delprete84 Car Audio, Video & Security 22 09-24-2009 08:36 AM
can't stop the dimming. 4wdwrx Car Audio, Video & Security 5 11-19-2006 12:38 PM
05 STI - COBB uppipe install - what is the proper torque sequence? AnorexicSTI Vancouver Impreza Club Forum -- VIC 18 10-11-2006 01:00 AM
05 STI - COBB uppipe install - what is the proper torque sequence? AnorexicSTI Factory 2.5L Turbo Powertrain 0 10-02-2006 01:26 AM
can't find the LEAK WatsonBillSOT Newbies & FAQs 2 10-18-2004 06:18 PM


All times are GMT -4. The time now is 08:38 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.