Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

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 05-11-2018, 10:58 AM   #326
fleezy
Scooby Newbie
 
Member#: 436768
Join Date: Dec 2015
Chapter/Region: E. Canada
Location: Toronto
Vehicle:
2004 WRX
Silver

Default

can i make a 4 port catch can instead of 2 2 ports?
* Registered users of the site do not see these ads.
fleezy is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-11-2018, 12:09 PM   #327
Vancouver98STi
Scooby Specialist
 
Member#: 459287
Join Date: Dec 2016
Chapter/Region: VIC
Location: Vancouver BC Canada
Vehicle:
1998 JDM Impreza STi
V4 GF8 White

Question

Quote:
Originally Posted by KCRS01 View Post

when you use a closed loop system the oil just recirculates in the system, meaning, if it has dirt/contaminants it just go back to the engine.

while vent to atmosphere AOS vents the oil going to the pipe and going to the street. the dirty oil in the system is then completely removed and not recirculated.
Ummm.... there appears to be some sort of confusion here. Venting (or not venting) the PCV system to the atmosphere has nothing to do with where collected oil goes. These are two separate variables. The catch cans I use do not drain back into the crankcase, and it's a closed system... as Subaru originally intended it to be.
.

Last edited by Vancouver98STi; 05-11-2018 at 03:22 PM.
Vancouver98STi is offline   Reply With Quote
Old 07-20-2018, 09:45 AM   #328
VinceS2
Scooby Newbie
 
Member#: 353338
Join Date: Apr 2013
Chapter/Region: International
Location: Newcastle Australia
Vehicle:
2005 EVO 8 WRX + STi
gold

Default

Because of the length of this thread, I started a new thread with a guide on what the smartest way to do the catch can mod is on a standard TMIC setup. See https://forums.nasioc.com/forums/sho....php?t=2879743
Just figured it was appropriate to cross-reference this thread back to that one, for completeness.
VinceS2 is offline   Reply With Quote
Old 01-27-2019, 01:48 PM   #329
edmartin81
Scooby Newbie
 
Member#: 439201
Join Date: Jan 2016
Default

Thanks for the post. I've been debating whether to install one on my EJ. I knew catch cans were needed to keep the FA ports from gumming up, but I didn't consider oil vapor condensing in the intercooler.
edmartin81 is offline   Reply With Quote
Old 03-01-2019, 11:42 AM   #330
GK1707
Scooby Specialist
 
Member#: 373868
Join Date: Nov 2013
Chapter/Region: Tri-State
Location: Queens, NY
Vehicle:
'04 STi
WRB

Default

Anyone know the hose sizes? I'm reading 3/8 between and 1/2. I'll be running a 3 port catch can.

PCV and breather IN to catch can and OUT to turbo inlet
GK1707 is offline   Reply With Quote
Old 03-01-2019, 08:06 PM   #331
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default

On my valve breathers 1/2” work great. Snug and No hose clamps needed.
pcampbell is offline   Reply With Quote
Old 11-18-2020, 03:52 PM   #332
sebastian323
Scooby Newbie
 
Member#: 510671
Join Date: Jan 2020
Chapter/Region: SCIC
Location: California
Vehicle:
2006 WRX
Gray

Default

how about this idea - I run a three port catch can with two inlets , one inlet going to the PCV and the other inlet to the valve cover breather lines, and the outlet to the turbo inlet pipe.

EDIT: just read this :
Quote:
WRONG WAY: Disconnect the PCV<->Inlet line as well as the Crank Vent<->Inlet line. "T" the PCV and Crank vent lines together, and run the remaining end of the "T" to a single nipple on the inlet pipe. Cap the remaining nipple on the inlet. You'll be sending boost into places that definitely shouldn't ever see any. Bad idea.
I don't understand how t-ing the lines together is bad if they both ultimately share a junction at the turbo inlet pipe (which is under suction and not boost from the turbo) can someone elaborate.

also , as I understand vented catch can is not a god idea as it will allow unmetered air into the system
sebastian323 is offline   Reply With Quote
Old 11-18-2020, 05:13 PM   #333
Peaty
Techno Sapien
Moderator
 
Member#: 449
Join Date: Oct 1999
Chapter/Region: MWSOC
Location: Lawrence, KS
Vehicle:
2019 Impreza Sport
Lithium Red

Default

Might as well put this here ADD W1 CC on 2019 Impreza Sport

https://photos.app.goo.gl/rNGgBQvBkKaiYtjA6
Peaty is offline   Reply With Quote
Old 11-22-2020, 01:00 PM   #334
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default Catch Can FAQ

Quote:
Originally Posted by Peaty View Post
Might as well put this here ADD W1 CC on 2019 Impreza Sport

https://photos.app.goo.gl/rNGgBQvBkKaiYtjA6


Blast from the past— I used to work with Kastle (in real life). Do you keep up with him?
pcampbell is offline   Reply With Quote
Old 01-23-2021, 11:39 AM   #335
relic48
Scooby Newbie
 
Member#: 408588
Join Date: Dec 2014
Default

Just in case anyone is interested in 1957 "unmetered air" and emissions, scroll down to the 3rd paragraph in the article and look at the picture below it.

https://www.chevyhardcore.com/news/t...c-small-block/
relic48 is offline   Reply With Quote
Old 08-21-2021, 05:48 AM   #336
tmp042
Scooby Newbie
 
Member#: 524797
Join Date: Jun 2021
Location: Down Under
Vehicle:
2010 XT Forester

Default

After seeing so many crudely drawn catch can hose routings and incorrect layouts I decided to put this together.
It’s based on the 08-12 WRX/XT intake, but the principle is still the same across the range.
The position of the catch can is irrelevant in the diagram as it’s just for illustrative purposes.






tmp042 is offline   Reply With Quote
Old 08-21-2021, 08:13 AM   #337
tmp042
Scooby Newbie
 
Member#: 524797
Join Date: Jun 2021
Location: Down Under
Vehicle:
2010 XT Forester

Default Catch Can bracket

On the 08-12 WRX/XT there are not many easily accessible locations for catch cans. But for those running their intake in the guard (Process West system) there is plenty of available room.
I made up a bracket to mount them in front of the ABS module which allows easy access and a short hose route.





tmp042 is offline   Reply With Quote
Old 08-26-2021, 09:54 PM   #338
jgc731
Scooby Newbie
 
Member#: 291995
Join Date: Aug 2011
Chapter/Region: SCIC
Location: northridge
Vehicle:
2019 sti
world rally blue pearl

Default

sebastian323, Did you ever get this figured out? I was planning to do a 3 port catch can for my 2019 base STI also but I was concered about the sticky. Being a 3 port, the 2 hoses would go to each of the 2 inlets on the 3-port catch can. However, I am worried what is said about "capping the remaining nipped on the inlet".

Am I understanding this correctly, this setup doesnt catch for the CCV side and would require it's own catch can? I've watched youtube videos that this side doesn't even catch oil so is it still needed?

Quote:
Originally Posted by The Deliverator View Post
Wrong way:
Disconnect the PCV<->Inlet line as well as the Crank Vent<->Inlet line. "T" the PCV and Crank vent lines together, and run the remaining end of the "T" to a single nipple on the inlet pipe. Cap the remaining nipple on the inlet. You'll be sending boost into places that definitely shouldn't ever see any. Bad idea.
I saw this pic from earlier in this thread and see the 2x 2-port can setup. Does this cover the CCV side also?


it looks the top can is for the hoses where the nipple would have been plugged in the method described as the wrong way.

Last edited by jgc731; 08-26-2021 at 11:38 PM.
jgc731 is offline   Reply With Quote
Old 04-12-2022, 10:09 AM   #339
atomicmecha
Scooby Newbie
 
Member#: 371012
Join Date: Oct 2013
Chapter/Region: MAIC
Location: Martinsburg, WV
Vehicle:
2007 WRX STi
Blue

Default looking for clarity on my AOS setup please

Reading through this and still having trouble getting a clear answer if my idea will work. Didn't want to start another thread if I didn't have to.

I am using a grimmspeed AOS, the one that hooks to the oil filler neck, and want to also do some engine bay clean up and make things look cleaner. Since I went with fuel rails and braided lines, figured why not make it all braided lines. Got the fitting kit to swap all the breather vents to -an fittings. The 3 that equalize the pressure across the block is easy. T all 3 lines together and done.

The block port PCV is what I'm currently stuck on and need to know if I'm doing this right or wrong.

I plugged one of the inlet tube ports since I think I'll only need one vs two. I got rid of the hardline that runs across the intercooler and teed the 2 PCV vents and ran that to one of the lower ports of the AOS, this part I know is right due to the instructions from the kit.

I ran the top fitting of the AOS to the one inlet port I did not plug. This also seems to line up with the instructions.

Here is where I deviated and am trying to figure out if this is right. I removed the entire pcv check valve assembly because now the port on the block is just a -12an fitting. I plugged the vac port under the throttle body that the pcv vent went to. And the port on the inlet that I said I plugged earlier is where this check valve assembly went to before. I then ran a -12an hose from that port to the other lower port on the AOS.

Is that going to work and be safe to run? Guess my concern is that I removed the hard vacuum source from the system and now it relies on the slight vacuum from the inlet pipe before the turbo. Thinking it'll work since any extra pressure still gets vented back to the inlet hose through the aos.

And yes, i know this AOS isn't the popular choice since it recycles the oil back into the block. But this is a DD and not a track car. Got this to help clean up the air going into the combustion side of the engine if I can. And then it spiraled into a cleaner engine bay project since the motor is out and being rebuilt atm.
atomicmecha is offline   Reply With Quote
Old 04-12-2022, 05:50 PM   #340
tmp042
Scooby Newbie
 
Member#: 524797
Join Date: Jun 2021
Location: Down Under
Vehicle:
2010 XT Forester

Default

Hope you kept the receipt.
Flatrions Tuning did multiple tests via measuring crank case pressure and that was by far the worst one.
After their investigation many suddenly appeared for sale.
tmp042 is offline   Reply With Quote
Old 04-14-2022, 04:26 PM   #341
atomicmecha
Scooby Newbie
 
Member#: 371012
Join Date: Oct 2013
Chapter/Region: MAIC
Location: Martinsburg, WV
Vehicle:
2007 WRX STi
Blue

Default

Quote:
Originally Posted by tmp042 View Post
Hope you kept the receipt.
Flatrions Tuning did multiple tests via measuring crank case pressure and that was by far the worst one.
After their investigation many suddenly appeared for sale.
i saw that video. I think that setup wasn't plumbed right. But now I'm curious. I wanna tap into the crank and see what kind of vac and pressure I see once its running again.
atomicmecha is offline   Reply With Quote
Old 01-13-2023, 05:34 PM   #342
andrvg7
Scooby Newbie
 
Member#: 532826
Join Date: Jan 2023
Default Catch Can Question

I recently bought a catch can from Boomba for a 15+ wrx and it’s facing the wrong way?? I dunno if I’m just a noob and don’t know how to adjust it or if it’s a manufacturing issue but the hose things look like they should be facing the same way as the bolt and face to the side.
andrvg7 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
Catch can maybe reduce oil use? leighton1245 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 18 06-05-2010 06:38 PM
Oil catch can...or catch canS?? BoXinWRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 3 07-28-2009 05:01 PM
Installed OBX catch can... (another catch can thread) txl146 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 5 09-10-2008 01:00 AM
WTT(HR): Greddy Oil Catch Can with Perrin Oil Catch Can scooby_wooby MAIC Private Classifieds 1 03-24-2008 09:01 PM
WTT: Cusco catch can for a perrin catch can sti charles Engine/Power/Exhaust 10 11-29-2007 01:04 AM

All times are GMT -4. The time now is 07:42 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.