So what does this PVC check valve do? Is it necessary?

The STS PCV valve prevents boost from pressurizing the cranckcase. When the valve sees 3 psi (at least i think it is 3 could be 1 psi ????) the valve vents the boost pressure in the tube to the atmosphere. When the system is in vaccum the pcv works as designed and sucks the pressure out of the crankcase. If you look you will see that there is no pcv valve on the passenger side pcv outlet.

Probably not a good idea to presssurize the crankcase under boost.

The pcv valve also puts the oil return pump from the turbo back to the engine in high speed mode. Thus the oil pump goes to high speed when the system is under boost.

There you go. Two reasons why the pcv valve system is required on the STS turbo. :judge:

:cheers:

So do all turbo setups require a PCV check valve? Anyone know where to get one?

So do all turbo setups require a PCV check valve? Anyone know where to get one?
I would not say they require one ( the Dodge STS system does not use one ) but it is not a bad choice tho. The Dodge GSM supercharger uses one but some folks have been disconnecting it ( sometimes the valve closes too late and pops the dipstick out due to high crankcase pressure! ).
You can make your own easily enough, just find a one-way type valve and plumb it between the PCV and the intake hoses ( flow pointing to the intake side ). Make sure it is OK for use in an oil environment and check the operation occasionally.

The STS PCV valve prevents boost from pressurizing the cranckcase. When the valve sees 3 psi (at least i think it is 3 could be 1 psi ????) the valve vents the boost pressure in the tube to the atmosphere. When the system is in vaccum the pcv works as designed and sucks the pressure out of the crankcase.

:cheers:
Just a little correction to Morts description of how it works. When the valve is activated under boost, it seals up the intake side so all boost is going into the motor and lets the crank case vent to atmosphere. That's why there is a little filter on it.

Here a couple of links to valves I think will work, what do you think?

http://www.dejontool.com/dsm-misc.htm

The part number is 4610K17 for the site below.
http://www.mcmaster.com/

I would like ot know what everybody is using also. I put a open breather on my truck to vent to atmosphere, but I would like a check valve on the PCV also.

Just a little correction to Morts description of how it works. When the valve is activated under boost, it seals up the intake side so all boost is going into the motor and lets the crank case vent to atmosphere. That's why there is a little filter on it.

That makes more sense. Thanks for pointing that out. :)

ok can't find it but i'll try to explain. you have two vent one pcv except for ours i guess and the vent on the passenger side. route both of those to a "T" fitting then to your catch can then from the catch can go to your intake piping ( before turbo intake or before supercharger intake) the get a small piece of hard tubing like 1/4" i guess and slash cut it at about a 45* angle then insert that into the intake tubing with the slash cut pointing toward the turbo intake or supercharger intake. this will couse a venturing affect (a vacuum from the air passing by it) this will create a vacuum in the crankcase lowering blowby and crank windage. inturn less resistance on the rotateing assembly releaseing hp.
this is from another post i made before

sorry for the spelling

Here a couple of links to valves I think will work, what do you think?

http://www.dejontool.com/dsm-misc.htm

The part number is 4610K17 for the site below.
http://www.mcmaster.com/
I would say the one from McMaster-Carr would work just fine, and its much cheaper then the other. :)

Great information guys!! I know what to do and how to make part of my system more efficient. :)