Plan to decrease Crankcase Pressure, Pics included Options

[erics1one]

Well I think oil is being pushed out my turbo seals due to postive crankcase pressure, and I need to find a way to decrease the pressure. Theres a few different ways to go about doing this.


PCV Valve -> Turbo Intake AND/OR
PCV Valve -> Intake Pipe (my IC)

Currenty my PCV valve has a breather:


You can see the PCV Valve -> Turbo Intake setup here, which can be found on the stock 3sgte:



Some tap their PCV to their intake. The Injen Intake kit comes with a tap already in the pipe:



So I've been trying to decide what setup would be best with the equipment I have (5SFTE). Been talking to 'Byron' from mr2oc.com, he's knows his stuff when it comes to PCV stuff. I've been leaning towards hooking both intakes up. Was told here:
http://www.mr2oc.com/showthread.php?t=71237
...that the small hose from valve to intake would decrease pressure during idle, while the larger hose from valve to turbo would decrease pressure during boost. Since I have a turbo, should I just connect the large hose to the turbo? Just connect a small hose to the intake? Split the PCV valve in two, running to both the Intake, and Turbo?



A: 5/8' hose to turbo
B: smaller hose to intake
C: one way valve

This post has been edited by erics1one: Dec 8, 2004 - 8:12 PM

[Fox-N-It2]

You sure you dont need a bigger restrictor in you oil line to the turbo to ease the pressure? Your breather should be doing enough the way it is.

[Hanyo]

wont you notice boost leak if you take into your piping and connect it to the intake end of your turbo?

[erics1one]

You sure you dont need a bigger restrictor in you oil  line to the turbo to ease the pressure?  Your breather should be doing enough the way it is.
[right][snapback]216207[/snapback][/right]

I would actually feel more comfortable creating more of a vacuum on the PCV, then to restrict the oil feed going into the turbo.

This post has been edited by erics1one: Dec 3, 2004 - 9:16 AM

[erics1one]

wont you notice boost leak if you take into your piping and connect it to the intake end of your turbo?
[right][snapback]216209[/snapback][/right]

Well as you can see in the pictures "You can see the PCV Valve -> Turbo Intake setup here, I believe this is the stock setup found in the MR2 Turbo:" They have it running to their turbo intake. Are you questioning this single line?...or that a vacuum leak would be created if I tried to do both?

[presure2]

what you wanna do is route that back to your intake piping BEFORE the turbo. with a catch can in the middle to keep your intake piping clean.

[Supersprynt]

I have a breather on mine and its getting pretty gross - a catch can sounds like a good idea.

[erics1one]

I have a breather on mine and its getting pretty gross - a catch can sounds like a good idea.
[right][snapback]216229[/snapback][/right]

I agree, a catch can will definitely be a part of my final setup, but where should I run the PCV hose?

[presure2]

it should go from your pcv valve to the catch can to the intake piping.

[lagos]

or you can hook it right up to the intake piping, before the turbo, with no catch can. i dont have a can on mine, and my piping stays clean. the only thing that gets some oil is the turbo compressor, and i cant see that as a bad thing, since its lube.

connecting it to your IC piping would probably be a bad idea. you would have boost going into your vavle cover, that cant be good. do it the same way that an alltrac setup is done. before the turbo, into the intake, optional catch can in between.

the breather filter is not the right way to do it. i talked to people that said their car smoked a lot because of that breather on it.

basically ....A to B , but not to C on your diagram. also, make a nipple for the intake connection.

This post has been edited by lagos: Dec 3, 2004 - 1:15 PM

[erics1one]

connecting it to your IC piping would probably be a bad idea. you would have boost going into your vavle cover, that cant be good. do it the same way that an alltrac setup is done. before the turbo, into the intake, optional catch can in between.

basically ....A to B , but not to C on your diagram.  also, make a nipple for the intake connection.
[right][snapback]216285[/snapback][/right]

Well the 'one way valve' on the hose going to the intake should prevent boost from entering the valve, but I see what you're saying.

This weekend I should have time to run a line from the valve to the turbo intake, and I think is going to be my 'Final Answer.' If I still have problems, then I'll see if running to the intake manifold (or both) proves better.

[Supersprynt]

or you can hook it right up to the intake piping, before the turbo, with no catch can.  i dont have a can on mine, and my piping stays clean. the only thing that gets some oil is the turbo compressor, and i cant see that as a bad thing, since its lube.
[right][snapback]216285[/snapback][/right]

Kinda flawed thinking - you have oil going into your intake & compressor which may not damage your compressor but it certainly isnt helping. The oil isnt stopping there its going into your intercooler piping and if it can make the journey it will go into your throttle body. My point is that its replacing air, no 2 objects can hold the same space at the same time. So consequently, its hurting performance and probably hurting your intake temps.

[erics1one]

what you wanna do is route that back to your intake piping BEFORE the turbo. with a catch can in the middle to keep your intake piping clean.
[right][snapback]216215[/snapback][/right]

If I put the hose into the Turbo Intake, it would still be 'before the turbo'.

I can see what your saying in others profiles...but off of what knowledge do you suggest going from the PCV to the intake mani?


Its standard in the Alltracs for the PCV to run to the Turbo Intake...but then its suggested to run the PCV to Intake Manifold when installing an Injen CAI.


I'm just trying to find would work best with my 5sfTe setup.

Has anyone experimented with these different hose diagrams?

This post has been edited by erics1one: Dec 3, 2004 - 8:01 PM

[lagos]

or you can hook it right up to the intake piping, before the turbo, with no catch can.  i dont have a can on mine, and my piping stays clean. the only thing that gets some oil is the turbo compressor, and i cant see that as a bad thing, since its lube.
[right][snapback]216285[/snapback][/right]

Kinda flawed thinking - you have oil going into your intake & compressor which may not damage your compressor but it certainly isnt helping. The oil isnt stopping there its going into your intercooler piping and if it can make the journey it will go into your throttle body. My point is that its replacing air, no 2 objects can hold the same space at the same time. So consequently, its hurting performance and probably hurting your intake temps.
[right][snapback]216319[/snapback][/right]

you can blame toyota for my flawed thinking, cause thats how the stock 3s setup is. ive taken my ic piping out many times and there is not a drop of oil in it.

[Supersprynt]

Well yeah thats why im saying its not harmful, just unproductive ya know?

[erics1one]

Okay, so I ran the hose from my PCV valve to my turbo. It feels a ton better. The smoke has decreased a lot, but is still present a few seconds after idleing. So...

This mean my turbo seals are bad?
Could I still have excessive pressure?
Should I try to run it to the intake mani? Or both?
Should I replace the 'O Ring' on the downpipe where its venting?
Could my 16% leakage on cyl 2 cause this?

I'm losing very little, if any, oil. And I don't have any oil in the IC or Turbo Intake piping.

I'll try to get some updated pics up this weekend.

This post has been edited by erics1one: Dec 8, 2004 - 10:14 PM

[JGS3SGE]

If your on the stock turbo with stock lines (assuming your oil drain line isn't plugged)... you turbo may need service. And its not the seals that are normally the problem... if any of the bearings are worn or even just a little groove will make a seriously smokey turbo if left unchecked. It can feel plenty tight and still smoke like hell (feeling the clearance is a big waste of time anyhow).

[erics1one]

Well heres the shot of my new line ran


...but, like I said, still smoking. Been still debating with peeps about what the correct setup is. Some suggest installing a catch can on the new line. Some suggest the throttle body pcv is ran incorrectly.

[presure2]

hehe we keep bouncing back and forth between forums...lol
anyway,
that spot where you tapped from isnt your PCV valve, if you follow the line in the pic (#10i think it was) back to the valve cover, the little plastic thingy the hose is connected to is the pcv valve. thats the one you wanna put the catch can in-line with, then to the intake pre-turbo like in your pic here..it'd prolly be a good idea to leave that line you have there connected too, or you could prolly put the breather back on it.
HTH
manny

[zipstrips]

the PCV works off vacuum... if you place that 2nd one near the throttle body once you boost u will be CHARGING the crankcase so it needs a one way valve to lock the boost out... all pcv's need open atsmophere or a strong vac. source. ex turbo inlet before the compressor. do a search for crankcase valves. there expensive but make it possible to place that one hose near the throttle body if you wish to.