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Another Catch Can thread

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Old 11-02-2011, 11:58 AM
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Video Another Catch Can thread

OK, grabbed my post off another members thread...figured I'd post some pics of my install, etc.

Sorry to dig this up, but I am installing my own catch can after seeing all the oil in the driver side intake and lower intercooler hose. I am doing mine a bit different though. The center port off the manifold only breathes while idling, any pressure seen and it closes (1 way check valve).. Same for the turbo inlet side...which in most cases would never see pressure, unless you had a stuck closed diverter valve that forces air out of the turbo inlet. Otherwise, it's always pulling a vacuum through the turbo inlet, at idle, engine speed and boost. I think that the idle air control is operated at the throttle body, it must bypass air there. Either way it comes from metered air through the turbochargers and capping this shouldn't cause any additional crank case pressure. So I'm going to cap the center port on the manifold and hose clamp it.

I am running a hose 3/4" ID from the driver side turbo near the inlet side (a factory plastic tube used to be there) to one side of my catch can. Another hose will run from the driver side valve cover to the other side of the catch can. This should take care of the crank case evac system. If this sounds easy...IT WASN'T, in fact it was a huge pain the *** to do it right.

Now, here's some other issues that I have to address while doing this project. The hose for the boost solenoid dumps into the factory plastic tube that goes to the turbo inlet...not a big deal, I can just run it to catch can if I have too, but first I'm going to try and put in a MBC. I wanna see if it throws a CEL, if not then I'll keep it in there.

Now here's the wacky part. There's a hose that comes off the port of the manifold, same spot where it pulls vacuum from the crank case....It's the smaller hose that comes off the left side (the bigger crank case hose comes of the right side or driver side). This hose goes around the left side of the throttle body, under it, into a T rubber fitting and then dumps into the same plastic tube for the crank case evac hose. There is NO check valve either on this hose! Not kidding, so basically when idling, it pulls air from crank case plastic hose, when boosting...it pressurizes the system forcing air back into the crank case hose, it doesn't pressurize the crankcase because of the one-way check valves, but still blows boost back into the turbo inlet. I literally looked at this and looked at it some more...It blew my mind figuring out why this would be there!? I could possibly understand, why it MIGHT be there for idle, usually the IACV takes care of this though, but to bleed off pressurized air from the manifold is WEIRD. I reconnected the hose to the sensor that sits next to the driver side fuel rail, should be fine.

Sorry for the long post, but if anyone is considering doing it all the way...there's a few things to think about.

I started it and drove it to work this morning and all seems fine. I think I'm going to install a vacuum gauge on the catch to see just how much vacuum its pulling at idle now through the catch can. If I have any issues, I'll post them here.

Pics below:





lol dont be scared of the last picture! just for reference mostly, haha

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Last edited by 03EvoIII; 11-02-2011 at 03:07 PM.
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