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Old 05-14-2006, 11:15 AM   #1
ImprezaRSfan!
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Default pcv routing with rotated mount turbo

So i have a gt35r on a ultimate racing rotated mount uppipe, and i have no subaru intake tract for the pcv line and breather lines off the heads.

im not sure what i should do with the 2 lines now. normally they both route intake the intake system. I was goign to just block them off, but i was reading that it sucks clean in air and bad air out of the crankcase at vacuum, so that sounds beneficial enough to not block it off.
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Old 05-14-2006, 05:23 PM   #2
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Old 04-05-2011, 05:31 PM   #3
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Instead of making a new thread I will bump this one. I want to know the same thing. I am rotating a Precision 50 trim and would like how to route the PCV and crankcase breather lines back into the intake or however people do it. Thanks for the help
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Old 04-07-2011, 10:07 PM   #4
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well depending on what intake you have you will need to route them into the intake pre turbo and post maf somewhere. putting a oil catch can between the three and the turbo intake point is benificial to keep the fuel octane consistent since blow by oil into the intake lowers the octane rating. If you have a recurculating bov u will need to put a fitting pre turbo as well to route the air back into the system.

As for the oil catch cans the best thing to do is use one for just the pcv valve and remove it in general from the system. i would do a search for pcv valve delete threads or something to get more details. Then for the head breather fitings route them into a t and into an oil catch can and route the out fitting on the catch can into the intake pre turbo like mentioned above.

Dont forget you will have to change the oil return line a little since its mostly a solid tube off the engine. the coolant return shouldnt be a problem with a different hose length.
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Old 04-07-2011, 10:29 PM   #5
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lol well I knew all that but thanks for the info. I am needing to know how people run there lines when they just have a solid intake tube on the turbo or just a filter
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Old 04-08-2011, 09:44 AM   #6
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okay. well for an intake i am in the process of getting parts together to make a CAI. will consist of a few silicone pieces to hold it together and a blowthru maf so the maf has somewhere to go into. making the main piece coming off the turbo as aluminum or stainless and welding fittings on it for the breather lines and pcv line to attach to it with.
Its kinda custom but should work well and allows you to build almost any size intake and have your filter be in any location you want.
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Old 04-08-2011, 02:08 PM   #7
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Awesome man!! yeah I was just wondering since sometimes people just put a filter on there turbo or some people dont even run an intake at all
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Old 04-08-2011, 04:19 PM   #8
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the people who run just a filter run on speed density which only goes off tempurature, psi, and VE but thats another topic. To keep your current type of tuning you need to get a maf housing somehwere between the filter and the turbo so the sensor can monitor the amount of air entering the system. I would contact your local tuner and see if they can tune speed density if you decide to go the only filter route. most stick with MAF tuning tho for its ease of learning and quick changes that can be applied.
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Old 04-08-2011, 04:59 PM   #9
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Im on Speed Density now on my UTEC.
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Old 04-08-2011, 05:05 PM   #10
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get silicone piece and a filter and done deal! Will have better flow= more power! The blow by gases can be put into the atmosphere after being filtered through a catch can without anything bad being put out besides water condensation and small bits of oil left.

if you want to reintroduce them into the intake get a 6" piece of stainless and have a shop or someone weld a bung on to route them onto.
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Old 04-08-2011, 05:26 PM   #11
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Thanks man!! I appreciate it!! That is what I will do
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Old 06-19-2015, 08:31 AM   #12
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I am going to bump this old thread since I am a bit confused on a few things with my Hybrid build and PCV.

I have a 2002 WRX with a built bottom end off a 2005 STi. Currently I have the middle 2.5L block port capped. I have both WRX head ports T'd going to a catchcan and venting to the atmosphere. I have my OEM PCV valve still in place in the intake manifold, I have tubing going from it to a catch can and venting to atmosphere. Is this the correct formation of how it needs to be? I hear of some people just deleting the PCV valve by capping it off and going with an AOS. I am unsure if this is safe or how to do it. I am running a 4 inch intake with no vacuum ports to my turbo. Also see some people running the fumes and oil back into a port on the oil filler cap. Can someone shed some light? ThANKS!

Some people are running 1 can with a breather on top with the crankcase (pcv) and the valve covers going to it. When this is done, there is a lot going on in the can and the pressure is released into the air.

When running a single can for PCV and a single can for valve covers which is what I am running with a breather filter letting it to vent to atmosphere, i am bypassing any kind of fluid going back into the engine.

I do not have any ports on my 4 inch intake inlet going into my turbo. I haven't made a port in my oil cap so that oil blowby can go back into my valve covers.

I have been running this method for awhile now unsure if this is the best way to do it. While trying to understand all this and all the different style catchcans out there, it is hard trying to make the right decision.

How does one make a right decision when you have the choice of running a traditional catch can, Crawford AOS, Grimmspeed AOS, IXIZ AOS, Hybrid breather cans,and vacuum pump breather tanks. Its so confusing HA

Last edited by emsmap; 06-19-2015 at 02:14 PM.
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Old 06-20-2015, 04:57 PM   #13
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Bump for info
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Old 06-22-2015, 08:12 AM   #14
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Bump for an answer
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Old 06-23-2015, 08:20 AM   #15
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Old 06-23-2015, 10:39 AM   #16
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The whole point of a PCV system is to allow blow-by gasses to be treated by the catalytic converter. That's it. If you are catless, what's the point in sending blow-by back through the intake?

Also, the oil coming out of the PCV should be insignificant. It's just oil vapor, afterall. If you are getting a LOT of oil coming out, chances are the compression rings are shot, allowing excessive blow-by.

So, my opinion is, as long as you are not dribbling oil everywhere, you're doing it right.
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Old 06-23-2015, 02:27 PM   #17
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Should I take out the PCV valve though and plug the manifold? or..... keep it in and still run it to the breather can?
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Old 06-24-2015, 09:30 AM   #18
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answer?
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Old 06-24-2015, 10:47 AM   #19
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I always left it in and plugged the manifold so there are no intake leaks.
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Old 06-24-2015, 01:32 PM   #20
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Cool! So then from crankcase, just run a hose to the catch can breather?
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Old 06-25-2015, 11:11 AM   #21
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???????
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Old 01-28-2016, 09:45 PM   #22
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Im bumping this bcuz im sorta in the same situation as the OP with a few differences

I am running Speed Density and have nowhere to run the Crankcase breather hose that normally goes to the Intake Tube. Right now it is just capped off, but im wondering if its better to vent it to Atmo with a small Filter? Or just run it through a Catch Can than Vent to Atmo?

Any help is Appreciated!
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Old 01-28-2016, 11:03 PM   #23
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Anywhere is fine as long as it's not back into the combustion system.
Either a CC & VTA
or
CC to an exhaust scavenging system
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Old 01-28-2016, 11:24 PM   #24
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Quote:
Originally Posted by dangerousatom View Post
Anywhere is fine as long as it's not back into the combustion system.
Either a CC & VTA
or
CC to an exhaust scavenging system
Thank you, I think I have it set up wrong bcuz I have zero venting going on right now. The line that normally goes from the CC to Intake is capped off.
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Old 01-29-2016, 12:55 AM   #25
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Correct :
Zero venting is not good
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