Quote:
Originally Posted by S14DB
Manifold vacuum is much higher then turbo intake. The line from the intake to the T is mainly for the intake of clean metered air to the crankcase. All the shit comes out the PCV into the Intake Manifold.
Best solution is to put a Catch Can between the PCV valve and the Intake Manifold. If your are really anal, another one between the VC and the intake tube.
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But when you really need vacuum pulled on the crankcase is when the intake manifold is under boost. Exactly why the stock PCV valve is basically a check valve which prevents boost in the intake manifold from going to the valve cover.
The turbo inlet is the best source of vacuum at WOT.