Welcome to the North American Subaru Impreza Owners Club Monday December 29, 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 (EJ Series Factory 2.5L Turbo)

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 02-02-2013, 12:00 AM   #1
beanakai
Scooby Newbie
 
Member#: 339125
Join Date: Nov 2012
Chapter/Region: W. Canada
Location: Lake Country, B.C.
Vehicle:
2008 WRX w. cb, ap
Silver

Question catch can: bought vs homemade

I have a 2008 wrx, should i be running one catch can or two? And would it be better to buy one or make one? PVC, stainless, aluminum?
* Registered users of the site do not see these ads.
beanakai is offline   Reply With Quote
Old 02-02-2013, 12:03 AM   #2
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

Have you thought about the fact that there are like 42 engineers that are paid in excess of what you will make in your lifetime at Fuji Heavy Industries that have debated this same issue since 2001 and decided that the correct answer is zero catch cans? I'm only being 2% snarky with this response.


<--------has Crawford ver 2 AOS, but only has it as he won a Crawford Facebook contest and got it for $0 shipped.
Unabomber is offline   Reply With Quote
Old 02-02-2013, 12:06 AM   #3
beanakai
Scooby Newbie
 
Member#: 339125
Join Date: Nov 2012
Chapter/Region: W. Canada
Location: Lake Country, B.C.
Vehicle:
2008 WRX w. cb, ap
Silver

Default

Good to know, i had a bit of oil in the intercoller and such, just a usual subaru thing?
beanakai is offline   Reply With Quote
Old 02-02-2013, 12:26 AM   #4
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

A perfect turbo will always spit some oil which will end up in the intercooler and hoses and throttle body and pretty much everywhere in the engine. While there are some here that put the lotion in the basket on this issue, I do not.



<-----------has 160,000 miles on his Subaru and gives zero ****s about oil
Unabomber is offline   Reply With Quote
Old 02-02-2013, 03:19 AM   #5
Eddiesubaru66
Scooby Newbie
 
Member#: 272905
Join Date: Feb 2011
Chapter/Region: MAIC
Location: Mclean
Vehicle:
2011 Sti limited
Blue

Default

Quote:
Originally Posted by Unabomber View Post
A perfect turbo will always spit some oil which will end up in the intercooler and hoses and throttle body and pretty much everywhere in the engine. While there are some here that put the lotion in the basket on this issue, I do not.

<-----------has 160,000 miles on his Subaru and gives zero ****s about oil
Catch can or not is depending on what power lvl and setup u have?? Plz educate me, Unabomber thank you
Eddiesubaru66 is offline   Reply With Quote
Old 02-03-2013, 02:02 AM   #6
aboothman
Scooby Specialist
 
Member#: 127745
Join Date: Oct 2006
Chapter/Region: NWIC
Location: Humboldt County
Vehicle:
06 WRX 30r 6 speed
99L EJ255 6 Speed

Default

A catch can is a good idea even on a stock setup. Take it from someone who has actually run with and without one for over 100k miles. The harder you are on the engine, and the more miles you rack up, the more blow by will get into your combustion chamber and I take tract.

This doesn't mean you have to blow $350 for a Crawford, but a decent can helps. The turbo has very little to do with it BTW...unless it has a bad seal
aboothman is offline   Reply With Quote
Old 02-03-2013, 05:31 PM   #7
meebs
Scooby Specialist
 
Member#: 3251
Join Date: Dec 2000
Chapter/Region: NWIC
Location: Lake Tapps, WA
Vehicle:
2009 WRX Hatch
DGM

Default

Quote:
Originally Posted by Unabomber View Post
Have you thought about the fact that there are like 42 engineers that are paid in excess of what you will make in your lifetime at Fuji Heavy Industries that have debated this same issue since 2001 and decided that the correct answer is zero catch cans? I'm only being 2% snarky with this response.


<--------has Crawford ver 2 AOS, but only has it as he won a Crawford Facebook contest and got it for $0 shipped.

Those same engineers likely made this decision (and others) with a 5 year/60K power train warranty in mind... I do however agree with you, most have no need for one. If your blow-by is that bad, you probably took the girly route on breaking in the engine.
meebs is offline   Reply With Quote
Old 02-03-2013, 06:55 PM   #8
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

My thought is unless you have a show car where these are nice for blingy in the various forms or you are a competitive racer....not Johnny Autocross....but real wheel to wheel racing where speeds in the triple digits are the norm....you do not not need a oil solution. Hell, if you were to go through our search engine, you would even find a catch can listed anywhere for like the last five years. They came from Japan for $Texas, then everyone knocked them off, then eBay found them and sold them for pennies, then the later versions like Grimmspeed and Crawford came out with refined versions. All much ado about nothing says I as I have seen zero posts here ever stating something like "my engine blew up and I wish I had a catch can of some sort". My opinion, your mileage may vary, void in Canada.
Unabomber is offline   Reply With Quote
Old 02-03-2013, 09:10 PM   #9
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

There are very few catch cans I would buy, the crawford being one of them assuming their description isnt made up and their swirlpot actually works. Every car is going to benefit from proper crank case ventilation and most factory systems are marginally designed for factory horse power in the interest of saving money. Once you start cramming significantly more air into the engine they often become woefully inadequate. But you need a properly designed solution for this and I'm not going to go into how to design one.

But more to your question. If you aren't going to pay the money for a real air oil separating catch can (ie north of $300), just diy it because you'll be getting the same can with a piece of scrubber in it if it even has a scrubber. Rather than trying to make your own fro scratch, start with an ebay can that can be opened, add your own brass scrubbers from the super market and put a baffle system of your choice in it that force the air to go through the scrubber.

The only catch can that I've seen the breaks the dont bother if its under $300 rule is these guys http://www.jcsautomation.com/vs%20catch%20cans.html
Leafy is offline   Reply With Quote
Old 02-04-2013, 02:25 AM   #10
synolimit
Scooby Specialist
 
Member#: 225225
Join Date: Sep 2009
Location: medina, oh
Vehicle:
11 WRX
335HP, 394TQ, 93 VF52!!

Default

I just made my own Crawford, simple, easy, cheap.

As for subi engineers I would put any faith in them! They do things absolutely as cheap as possible! The huge heavy cast iron UEL header is a joke beyond belief to make good power and torque. You won't see that short of runners and UEL design on almost all performance cars and race bikes. The OEM tunes are complete junk! Pistons suck. Glass trannies back in the day etc etc.

They make more money but their hands are tied by 100 different people like keeping the cost down and EPA. Aftermarket engineers have zero things to worry about and will always make things better in my book!
synolimit is offline   Reply With Quote
Old 04-16-2013, 08:30 PM   #11
kmoleggygt
Scooby Newbie
 
Member#: 284484
Join Date: Jun 2011
Location: WI
Vehicle:
2005 20g lgt

Default

^^^^^^^^^^^^^^^^^^^^^
Any chance of you posting the items used to make the can, I like your route!!
kmoleggygt is offline   Reply With Quote
Old 04-17-2013, 01:17 AM   #12
synolimit
Scooby Specialist
 
Member#: 225225
Join Date: Sep 2009
Location: medina, oh
Vehicle:
11 WRX
335HP, 394TQ, 93 VF52!!

Default

Just 3" tube and 3" ends to weld, 2" tube and 2" end to weld and 1/2" tube for in's and outs.
synolimit is offline   Reply With Quote
Old 04-24-2013, 11:07 AM   #13
kmoleggygt
Scooby Newbie
 
Member#: 284484
Join Date: Jun 2011
Location: WI
Vehicle:
2005 20g lgt

Default

Thanks, is there any check valves?? I hooked mine up last night, and now have smoke from exhaust. Shut car off immediatly. Why is this, 2 cans needed???
kmoleggygt is offline   Reply With Quote
Old 04-24-2013, 11:11 AM   #14
kmoleggygt
Scooby Newbie
 
Member#: 284484
Join Date: Jun 2011
Location: WI
Vehicle:
2005 20g lgt

Default

Ha and by the way synolimit, it seems that i am chasing you arround the different forums for answers. Sorry im not stalking, it just seems your route worked, with minimal diffuculty, cost, and confusion.
kmoleggygt is offline   Reply With Quote
Old 04-24-2013, 11:53 AM   #15
QueensEng
Scooby Newbie
 
Member#: 208469
Join Date: Apr 2009
Chapter/Region: E. Canada
Location: Toronto, Ontario, Canada
Vehicle:
2011 WRX
WRB

Default

Quote:
Originally Posted by Unabomber View Post
... My opinion, your mileage may vary, void in Canada.
Essplain yourself. I don't quite understand what you mean by this.
QueensEng 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 11:59 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.