AznSpik45

<center><img src="http://pictureposter.audiworld.com/19112/black_bar.jpg"></center><p>Sorry to keep on asking questions but i was just curious. When looking at the black bar, i remember before that there was some type of valve there that connected back to the intake pipe. Now i dont have that there. Well my question is should that valve be there or it doesnt matter?

AznSpik45

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Lambo-Bully

I don't have a pic, but that black thing you're referring to isn't the actual pcv valve. It does function like one, and you can configure it to be on there, but the best system to use if you're running a big turbo like that is a catch can. Then, use an aftermarket pcv valve, and run the vent side of the catch can to the port at the bottom of the intake manifold, and you can close up that port on the intake side of the turbo.

You have to be careful though, the stock pcv valve in that T hose also prevents boost from going into the crankcase! Make sure the a/m valve you get is up to the job!

xr4tic

but I'm sure I have the valve sitting around somewhere. I'll take a look at it this weekend.

I think it's a one-way valve of sorts to stop air from being bypassed through the turbo.

WYSIWYG

mine has a spring which i think is for a diaphram - probably limits the vac at WOT

Audiboy

maybe shut off the solenoid valve when there is probably excessive boost - due to a backfire or over boost.

The one way valve that once hooked up to the air cleaner - as Wysiwog already mentioned - limits the vacuum at WOT - in other words, when there is too much vacuum at the intake of the turbo - because the turbo is spooling hard, i.e. heavy load. Without the valve, the crankcase hose (his picture with arrows) hooked up directly to the input of the turbo can possibly create excessive vacuum in the engine under high loads. This will dissappear rapidly on deceleration or cruising, but I have to think about what would happen with excessive vacuum at the crankcase - for one, it will load up the turbine with oil, second, it may actually force the creation of more blowby gasses (gasses seeping past the rings) effectively lowering the dynamic compression ratio at high loads, and probably reducing ring life over time. I'm guessing, but AznSpik has good points. Probably best to just take it out of there and use a small air filter vent - or if you don't like smelling the fumes in the cabin or what to be environment friendly plumb the original PCV valve in there - although with you larger turbo, it may not be calibrated to flow properly since it would have vacuum later in the rpm range (boost builds up later) and much more vacuum at higher rpms. Probably not much significant because the 225TT I believe has the same part number

xr4tic

There is a PCV valve that goes from the intake manifold to the crankcase, it's connected to the T that comes off the crankcase vent and also goes to the metal tube that eventually wraps around to the turbo inlet.

There is also another PCV valve, which is the one that goes between the turbo inlet and metal tube.

If I remember, I'll take pics of both this weekend, it should be easy to do, the motor is out of the car

AznSpik45

so do u guys think i should put that solenoid valve thing back to the intake?

Audi2ptzero

The spring just goes over the center small tube in the middle of the valve which has the small hole in it. I looked at mine and there was no valve in there with the spring.

Dead

valve. Here is a cutaway.
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