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Old 03-03-2013, 11:50 AM   #276
amalgrover
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the 2.5's are going to have the extra vents on the heads and crankcase that are all connected together. they are on a hard line though, so there isn't any reason to mess with those. if you leave that hard line'd set of vents alone, the rest can be connected the same as in the picture here.
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Old 04-27-2013, 04:42 AM   #277
superhoeper
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Hi. I'm new here. I am planning on building two catch cans and I was looking for some insight. I have two ideas. Both will include either brass or stainless (aluminum is too expensive) npt fittings. The first option is to use small 4oz co2 tanks and the other is to use small water bottles like most diyers. I think I know the answer, but do you think that the stainless water bottle would be "better" than the aluminum co2 tank in terms of corrosion? Or is corrosion not a huge deal? I know its mostly oil in the catch cans, but ive seen some that collect a lot of condensation. Thanks
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Old 04-29-2013, 06:42 PM   #278
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bump bump
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Old 05-14-2013, 10:54 PM   #279
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Quote:
Originally Posted by amalgrover View Post
not sure if what you mean by "without an inlet", but if you mean without lines going to the turbo inlet then here ya go (found this on page 3)...basically take the two places on the inlet where those lines would have connected and cap them off. then the catch cans will just vent to atmosphere...



if you mean without an after market inlet, then it would be identical connections to this picture.

fyi, some of the flow direction arrows on this image are incorrect, but the routing of all the lines is correct and that is why i used it.
this is perfect, this is the right diagram, i new it had to be, the catch can makes most sense to be put beteewn the crank case and the T, the vapor that is nasty comes from the crank case, why would you not put the can on the single line from the crank case??

even manufacturers tell people wrong like the moroso 85510 catch can ugstall instructions, they make a nice set-up but i believe their instructions are wrong on the crank case can, i think these are right
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Old 02-08-2014, 12:30 PM   #280
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hello guys I'm new in this forum. sorry for my english I'm from norway
I have wrx 03 and I want to install catch can on my subi. can somebody tell me witch way is better to install catch can? 1pic or 2? thanks guys

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Old 02-09-2014, 11:55 AM   #281
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The correct way is with 2 cans, one for the PCV and one for the valve covers. The reason is that the one is pressure and the other is vacuum. In your drawing, I don't know about the 3 hoses for the PCV can, I kept the hoses on that "T" from the block and only have 2 hoses going to that can.

If you'd like to see some pictures of how it is on my 2002 WRX, let me know and I'll see what I can find.
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Old 02-10-2014, 07:08 AM   #282
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Quote:
Originally Posted by ThatGy View Post
The correct way is with 2 cans, one for the PCV and one for the valve covers. The reason is that the one is pressure and the other is vacuum. In your drawing, I don't know about the 3 hoses for the PCV can, I kept the hoses on that "T" from the block and only have 2 hoses going to that can.

If you'd like to see some pictures of how it is on my 2002 WRX, let me know and I'll see what I can find.
Yes, I would like to see the pictures. thanks
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Old 03-02-2014, 06:06 PM   #283
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I am trying to determine which dual catch can setup to get for an 06 WRX. I have narrowed it down to Saikou Michi and Moroso. Both seem nice, the Saikou Michi is much less expensive, but the Moroso allowes the catch can to be opened for inspection and maintenance.
I have done some research on both and was wondering if anyone had some additional advice on which to get.

thanks
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Old 04-21-2014, 03:37 PM   #284
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Quote:
Originally Posted by SwollRX View Post
I am trying to determine which dual catch can setup to get for an 06 WRX. I have narrowed it down to Saikou Michi and Moroso. Both seem nice, the Saikou Michi is much less expensive, but the Moroso allowes the catch can to be opened for inspection and maintenance.
I have done some research on both and was wondering if anyone had some additional advice on which to get.

thanks
I just discovered Saikou Michi and found good reviews on them. I'll probably go with them for looks and their customization capabilities.
Looks like it bolts up easy - http://www.saikoumichi.com/sti_dual_occ.htm

I guess it depends on how important it is to open it up... I don't see that being an issue but I'm a noob to this topic.
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Old 04-22-2014, 06:05 AM   #285
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Quote:
Originally Posted by WolfPlayer View Post
Please feel free, if you want, to include links to my custom dual catch can setup. I have received many compliments and many want to duplicate it.

Points of note:
1) No Bling. No need to draw attention to catch cans.
2) PCV and Breather are separate systems.
3) High Quality.
4) Something relatively compact.
5) No stock hoses or body panels are harmed in this process. Everything is 100% fully reversible if you want to go back to stock.

Pictures:
http://www.bescaredracing.com/sti/catchcans/complete/

Diary of installation:
http://www.imprezawrxsti.com/forums/...ad.php?t=17214

t

Following this. Thank you
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Old 05-26-2014, 08:39 PM   #286
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After all of this reading I did I am a bit confused. I have a built 2.5 and the way I routed my catch cans was the way I found people doing it 5 years ago. I do not know if this is correct to not, if not i would like to correct.

the two ports on the block are teed together and go to catch can 1, then the two farther most ports on the valve cover are teed and go to the same can,
now the two nearest valve cover ports go to catch can 2.

after reading this 11 page discussion I know I am doing something wrong. Mind you, I don't have have a intake going to the turbo, just screened, and I don't want to run in back into my motor, unless I have to. I can't take picture because I do not know on how to go about attaching it here.

Can someone please help so I can get rid of this big mess under my hood.
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Old 06-27-2014, 12:46 PM   #287
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I'm looking into converting my '15 wrx to flex fuel. I didn't see any mention in this thread of using a catch can for ethanol fuels to catch excess moisture (water) and avoid possible corrosion. Anyone have information/advice on this?
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Old 10-25-2014, 03:14 PM   #288
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Quote:
Originally Posted by jonfaiella View Post
I'm looking into converting my '15 wrx to flex fuel. I didn't see any mention in this thread of using a catch can for ethanol fuels to catch excess moisture (water) and avoid possible corrosion. Anyone have information/advice on this?
Raw aluminum is vulnerable to ethanol fuels so hard anodizing would be recommended, stainless steel and appropriate composites are good options. specifically inside a catchcan there is an abundance of fuel and moisture, all the ingredients for a nasty mix.

DIT motors (FA series) all benefit from a good blowby control system because the intake valves arent washed by fuel as much as purely port injected motors (EJ series). i saw some diagrams of a rotary separator that lives inside the timing chain cover on the end of the camshafts, but im not sure if this was just a subaru patent or is indeed in the current FA turbo motor. at the very least starting with a can between the crankcase and pcv is a good idea
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Old 11-10-2014, 08:37 PM   #289
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Can anyone help me? I have a single catch can set up on my N/A Forester, with a cold air setup, and I have the PCV's t'd, and the other hose has come loose. I have looked everywhere on the intake for where that hose is supposed to be connected, with no luck. At idle, the open hose is creating a vacuum, and my gas mileage has gone to crap.

any help would be greatly appreciated.
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Old 10-07-2015, 11:08 AM   #290
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Old 10-07-2015, 11:10 AM   #291
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Old 01-04-2016, 05:17 PM   #292
Msliwa2424
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Default 4 port catch can

just out of curiosity I saw a 4 port catch can with 2 inlet and 2 outlet ports. Could I just use this rather than two cans.
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Old 01-14-2016, 10:29 AM   #293
Zeeper
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Just a reminder to empty those catch cans!

I just opened mine to add a mishimoto drain tube and it was almost full, winter condensation is a real thing, it is filling it up fast!
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Old 01-26-2016, 12:01 AM   #294
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correct me if i'm wrong with any of this: in regard to the crank case vent and PCV... is this how one would route it?

Stock comes up from crank case vent into a T intersection where it splits off into two separate hoses: one that leads to the intake duct before the turbo, and then into a smaller hose that goes to the PCV underneath the throttle body.

incorporating OCC: hose from crank case vent straight into OCC, then outlet of OCC joins into the original T intersection that would split off to the PCV and intake duct?
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Old 04-08-2016, 01:49 PM   #295
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I was looking for a cheap plug-and-play style pcv AOS type of system and came across all of these:

http://www.amazon.com/Moroso-68781-Oil-Separator-Breather/dp/B000COU3NS/ref=pd_sim_sbs_263_1?ie=UTF8&dpID=41jS0LKcQbL&dpSrc=sims&preST=_AC_UL320_SR320%2C320_&refRID=0YNQ5074WCGN5HC0ACX5
http://www.amazon.com/JLT-Performance-PCVPF-B-Pre-Filter-Lightning/dp/B00B3ZEF02/ref=sr_1_234?s=automotive&ie=UTF8&qid=1460137396&sr=1-234&keywords=oil+separator&refinements=p_36%3A2000-99999999
http://www.amazon.com/Volvo-94-02-5cyl-Trap-AFTERMARKET/dp/B00USDVGWU/ref=sr_1_178?s=automotive&ie=UTF8&qid=1460077889&sr=1-178&keywords=oil+separator&refinements=p_36%3A2000-99999999

Could we possibly adapt something like this to our cars? The first one seems to just keep oil from leaving the crankcase... is it bad to trap blowby oil in the crankcase while relieving it of air pressure? This seems like a potential steal when compared to the $400 name brand options
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Old 04-09-2016, 08:31 AM   #296
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Quote:
Originally Posted by Prosport Gauges View Post
Since it vents to atmosphere I am assuming it's not emmisions compliant? Also for MAF based systems even the PCV system is to be "closed loop".
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Old 04-27-2016, 05:52 PM   #297
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After reading through almost all pages of this thread I only become more confused. I understand how the factory PCV system works and how dual catch can works. I bought a 3 port catch can because I installed a AMR hard inlet tube (APS clone). APS install instruction have the PCV teed with the breather tubes from the heads. Also isn't having a AOS the same thing as having a 3 port catch can? It basically tees the system together.

How is fresh air introduced into the system under light throttle with the breather lines teed with the PCV? Here is a picture of an AOS I found online with my thoughts. How does this differ from a 3 port catch can (besides one collecting oil)?



Under vacuum. Would it be possible to put a one-way check valve on the hose from the PCV system to force air through the breathers to act like stock?


Under boost, the PCV valve is closed and one way valve allows normal operation

Last edited by WRX Boss; 04-27-2016 at 11:20 PM.
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Old 05-13-2016, 08:06 AM   #298
WhatTurboLag?
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I will be running this can


http://realstreetperformance.com/Pro...Can-Black.html


Deleting PCV and doing -8's or -10's off the heads teed to a -10 to the can and a dedicated -10 from the block to the can
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Old 07-02-2016, 05:38 PM   #299
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I'm VTA and one line goes from pcv to inlet of catch can and one line T's off from the valve covers to catch can via another line. With manifold ports blocked. On top of catch can where filter would be I have a vent hose going down to ground. Liquid drops in can and or heated condensate and mixes fuel oil and now condensate. None VTA have no water since cool air cools vapors. Hence water in mixture. At idle more than enough crankcase pressure is vented with out the aid of vacuum. Cleaned my pcv as to not have to keep buying new ones. And the springs are so light that to open it takes less suction from a straw and cup of water to actually open pcv check valve. Or the pull off a cigarette. No issues or smells due to hose directed down below.
Like a breather on a motorcycle. Using vacuum still emits liquids and oil and dependant on change and catch can inner filter clean can be saturated before you even have time to change. Plus I'm in FL so no emissions. Crankcase vapors are metered charge that's already been expelled or would have been during exhaust stroke. Works flawless for me. Yes it's got all the mad but incase of bad gas my octane won't be affected as badly b
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Old 08-02-2016, 05:49 PM   #300
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Saw the perfect configuration at IA and now running it.

Dual can
1. T in from valve cover breathers, out to turbo inlet
2. In from crankcase, out to pcv

This requires relocating the pcv itself. Unfortunately there are a bunch of random hose diameters. But it's the only way to filter everything.
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