The good thing is that on the URD setup, the fresh air side hose is before the blower. So that side still functions the same as the N/A, TRD S/C setups.
I would have to say that either the PCV valve doesn't hold 100% of the pressure out, or that over time pressure is able to seep through. Thus why my can on the opposite side catches oil
Well it doesnt function the same entirely if the PCV valve is shut when exposed to boost.
N/A or TRD fresh air is drawn in through that side (passenger) INTO the crankcase and evacuated out on the PCV side (this is the way the system was designed to operate).
With your setup the PCV valve is closed almost entirely under boost (leaking some boost into the crankcase most likely), and your pulling on a blocked off PCV system through the 'wrong' end.
The PCV Valve on the TRD or N/A setups are NEVER exposed to boost (only more VAC). The less VAC the pintle in the PCV valve sees the less it allows through (idle and cruising). The more VAC the pintle sees the more it allows through until it goes full open and allows full draw (only being restricted at that point by the size of the PCV valve itself).
This is great because as boost is created with PD setups (Roots/Screw) it in turn pulls even more VAC on that valve really helping to evacuate crankcase pressure and blowby gasses under boost! The PD blower then in a sense becomes a free vac pump to relieve crankcase pressure & blowby gasses. The more load, the more vac, the more evacuation.
Where as a Turbo or URD setup - That valve shuts under boost not allowing ANY draw through the system. This doesn't allow much flow through the crankcrase and you are pulling VAC on the fresh air side with 'restriction' from the closed PCV side & that valve cover.
The fresh air side valve cover (passenger side) is designed to be more restrictive then the driver PCV side (to be purposely biased to flow better towards the PCV valve).
So really N/A TRD function much differently from Cent/Turbo. The only time the PCV system functions as it 'should' (as designed) with the cent blower/turbo is when there is no boost being made.
The rest of the time your oil is flowing out the passenger side because of crankcase pressure having no where else to go (because its restricted on the PCV side via the closed valve).
This essentially is defeating how the entire system was designed to operate in the first place. HOWEVER even with that being said it still has some advantage over just capping off the system entirely and running breathers or draft tubes.
