Welcome to the North American Subaru Impreza Owners Club Friday August 1, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
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.
Thread Tools Display Modes
Old 06-20-2009, 08:21 PM   #1
Scooby Newbie
Member#: 39487
Join Date: Jul 2003
2006 sti

Default my take on a catch can install

So my car has a blow through maf which I have to block off the pcv valve in order to prevent a boost leak. While I was reading up on that I started reading up a bit on crank case ventilation. In my research I decided to make some changes to my catch can hose routing.

Theory- when the car sucks in on the intake thus creating a vacuum that passes through the catch can and into the valve cover. Then since the valve cover and the crank case have tubes that connect them in order to equalize pressure will suck air from the crankcase into the valve cover and into the intake. Then the filter on the crank case will allow for a source of fresh air to be sucked in.

Disclaimer- I truly have no idea if this really works and by no means do I recommend that you should do this to your car.

The sti comes standard with a t fitting that connects both valve covers to the center of the crankcase Iím guessing to assist in equalizing the pressure between the two.

My stock line melted due to contact with the turbo so i replaced it with stainless steel lines.

Here you can almost see where the third fitting attaches to the crank case directly under the throttle body

Then I connected both valve covers to a t that ends at the catch can.

Then I ran a line from the catch can to a vacuum line on the intake. itís the stainless steel line closest to the filter.

Lastly take a crankcase breather filter and insert it over the previous location of the pcv valve on top of the crank case

* Registered users of the site do not see these ads.
awdturbo04 is offline   Reply With Quote
Old 06-20-2009, 09:34 PM   #2
Scooby Specialist
Member#: 172080
Join Date: Feb 2008
Location: 516

awesome, but that is one expensive breather system
aug is offline   Reply With Quote
Old 06-20-2009, 10:39 PM   #3
Scooby Specialist
Member#: 51684
Join Date: Jan 2004
Location: CO

Where is your maf sensor?
STIBungy is online now   Reply With Quote
Old 06-21-2009, 01:01 PM   #4
Scooby Newbie
Member#: 39487
Join Date: Jul 2003
2006 sti


its inside the intercooler piping
awdturbo04 is offline   Reply With Quote

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
Element Catch Can Install on my Built Motor ejh25 Built Motor Discussion 11 03-27-2008 10:48 AM
My Greddy oil catch can install mattjk Factory 2.0L Turbo Powertrain 76 01-07-2007 07:59 PM
Please Help on my Catch Can Install ColesSTi Newbies & FAQs 7 10-27-2006 01:12 PM
my take on cobb SS line install gsgleason Brakes, Steering & Suspension 8 10-19-2006 12:05 AM
Check out my oil catch can install jetguy Factory 2.0L Turbo Powertrain 45 07-30-2002 11:50 AM

All times are GMT -4. The time now is 09:08 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.