You are not getting a full 14.7PSI vacuum at the turbo inlet, but you will be below atmospheric pressure when the turbo is spooled. Air is drawn into the engine because of the pressure differential created across the compressor. There is both the static pressure drop there from the "air pump" action of the compressor, as well as a dynamic pressure drop through the inlet pipe as air rushes in (higher velocity in a fluid = lower dynamic pressure). You don't need a full 14.7PSI vacuum to draw blow-by gases out of the crank case. The blow-by is trying to put the crankcase at a higher pressure than the atmosphere, so even with the PCV going into open air the gases will flow out. They flow out BETTER when something is sucking on the PCV system, with 14.7PSI being the most vacuum you can draw.
Also, the catch can is a good idea in all cases. While the valve cover's oil separator does prevent oil from sloshing out the tube, you still have oil vapor in the air being drawn out, and it condenses on everything making a sticky mess whenever you turn the car off and it cools down / condenses.
Also, the catch can is a good idea in all cases. While the valve cover's oil separator does prevent oil from sloshing out the tube, you still have oil vapor in the air being drawn out, and it condenses on everything making a sticky mess whenever you turn the car off and it cools down / condenses.
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