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Old 12-14-2012, 08:32 PM   #1
JDwhiteWRX
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Default My Dual Catch Can Install

Dual Catch Can Install

The background behind this mod but in summary is I found my Grimspeed AOS worked fine on the street but at the track it was not doing its job so I decided to move to a catch can. Lots of research later I decided to do a dual catch can setup that would 100% retain the standard function of the Subaru PCV system.

This is my proposed hose routing



There are lots of catch cans on the market, some are junk, some are overpriced and some are overpriced junk. This lead me to Saikou Michi catch cans, he is a one man show building fully customisable catch cans to order at very reasonable prices. By using Mr Saikou I was able to get the hose fittings done in the sizes I wanted and get the drains and mounting bracket in the right spot so I could mount the cans where my battery used to be. The hose fitting sizes I have made to match the stock size connections for the entire system so we don't get any bottle necks.

One month later my custom cans where delivered to my door, the quality is top notch.



So I started pulling the car apart to fit the cans, hopefully this will be a thing of the past.



Here you can see the oil seeping out of the three way joiner from the crankcase. This is not the PCV on my car, my PCV is screwed into the intake manifold under the throttle body.



Here is the PCV, this location makes no difference to my intended routing.



In the RHD cars we have the brake booster sitting where you guys normally mount these cans, I had plenty of space where the battery was. Time to mount the catch cans, I traced the shape of the mounting bracket onto paper then checked to make sure there was no wiring behind before drilling the holes.



I used some stainless bolts with extra nuts so once done up I would not have to reach behind the fender liner again if I wanted to remove the cans.



All done



The cans fit really neat into this location and I can easily slide a dish under them for draining.



Now back to the hose routing, things are really crowded down here so I took the opportunity to do the throttle body coolant bypass mod to make a little extra room. To do this I simply removed the coolant line from the bottom of the throttle body and joined it back up to where the coolant line from the top of the throttle body comes up from the block. I then completely removed the hose that joins to the top of the throttle body and found it was the perfect shape to use in my catch can install.

A picture tells a thousand words. Here you can see I have the three piece joiner on its side with that former coolant hose going back up to the turbo air intake. The 19mm hose goes to and from the catch can and I shortened the other hose going to the PCV. This is exactly the same as factory except now we have a catch can grabbing the oil vapour before it goes back into the intake manifold or air intake.

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Old 12-14-2012, 08:33 PM   #2
JDwhiteWRX
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This photo shows the routing to and from the cans. 19mm hose to crankcase, 12mm hose to head breathers.



Not a lot of room here, getting the TMIC back on was a little more difficult.



Another shot showing hose routing



Very neat looking



I will keep you guys updated on what crap is collected in the cans under normal street driving and then track days.
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Old 12-14-2012, 08:44 PM   #3
sense of nature
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Nice job, looking fwd to the gunk pics
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Old 12-14-2012, 08:52 PM   #4
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Nice!

Did you get a new Y pipe? Your's looks ate up!
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Old 12-14-2012, 09:19 PM   #5
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No the y-pipe is fine.
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Old 12-14-2012, 09:26 PM   #6
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Quote:
Originally Posted by HinshawWRX View Post
Nice!

Did you get a new Y pipe? Your's looks ate up!
wut? his y-pipe looks almost new, you should see mine you'd crap your pants...
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Old 12-14-2012, 10:25 PM   #7
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I bought the same catch can set up. Still haven't installed it but am very excited to.
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Old 12-14-2012, 11:00 PM   #8
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Quote:
Originally Posted by JDwhiteWRX View Post
No the y-pipe is fine.
Must be my eyes then because the first picture of the oil in the intercooler it looks like a nice gash on the outside of it.
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Old 02-04-2013, 01:12 AM   #9
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any updates?
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Old 02-04-2013, 06:43 AM   #10
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The cans are still dry but I have not been on the track since installing them, just driving to work and the occasional weekend drive. My first track day is next month.
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Old 02-04-2013, 08:53 PM   #11
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cool beans i like
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Old 02-05-2013, 11:12 PM   #12
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i want
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Old 03-18-2013, 10:02 PM   #13
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Update?
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Old 03-20-2013, 06:26 AM   #14
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Still bone dry but I'm yet to do a track day this year, first one is the 13th of April. I didn't really expect to get any blow-by driving on the street.
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Old 03-20-2013, 08:49 AM   #15
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is there any filter media in the catch cans? I don't see a way to open them. Also what gauge cable did you use to relocate your battery and where did you put it?
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Old 03-20-2013, 05:52 PM   #16
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I noticed that your crank case hose is near the throttle assembly. Keep a close eye on that if you feel more resistance in your pedal. Don't want bad stuff to happen
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Old 03-21-2013, 06:09 PM   #17
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Quote:
Originally Posted by rdieder View Post
is there any filter media in the catch cans? I don't see a way to open them. Also what gauge cable did you use to relocate your battery and where did you put it?
There is a fine steel mesh built into the cans for the vapor to condense on, there are diagrams of the internals on the Saikou Michi website that show this.
Its true that you can't open the cans and this was the only negative I could think of in the whole design however the price pretty much doubles if you want cans of this quality that can be opened.
Battery relocation here but I have since moved it to the other side.

Quote:
Originally Posted by GhostSenshi View Post
I noticed that your crank case hose is near the throttle assembly. Keep a close eye on that if you feel more resistance in your pedal. Don't want bad stuff to happen
Thanks, will do.
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Old 04-01-2013, 10:01 PM   #18
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I just got mine in the mail today. Definitely a quality piece.
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Old 06-28-2013, 10:26 PM   #19
JDwhiteWRX
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This is typically what I am getting from the can fitted to the crank case after a motorsport event involving boost and corners (AutoX, RallyX).



Head breather can is still dry and I get nothing from daily driving in either can. Haven't done a circuit day yet, actually did 3 laps but spun off on the third and had to fix the car.
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Old 06-28-2013, 10:45 PM   #20
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do you get more oil in your pcv can or the can connected to the heads?
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Old 06-28-2013, 11:41 PM   #21
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Read my post, head breather is dry (no oil).
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Old 06-28-2013, 11:54 PM   #22
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My Saikou cans have collected a few drops in the PCV can and about half as much as the cup in your picture in the breather can. That was from two rallyx (24 runs about 1 minute each). I have forged pistons too.
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Old 06-29-2013, 12:02 AM   #23
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Next step for me is to remove the TMIC and see if she is oil free.
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Old 06-29-2013, 12:06 AM   #24
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Did you clean your TMIC when you installed the cans?

I did with simple green diluted and finished up with isopropyl alchohol, but I still don't think I got it whistle clean.
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Old 06-29-2013, 12:12 AM   #25
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No I just left it sitting upright for a few hours until the oil had drained out, there wasn't a lot so if no more has entered in the last 6 months I have been running this dual can setup then I expect it to be clean.
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