I havent read all responses yet, but I thought I would post. I did today what I had in my original diagram (and what the article discussed) today since I had my PCV valve vented, but the ventilation side still connected to the intake. Now, I have the intake 100% closed off except for idle air and FPR lines. I vented both sides of valve cover (the PCV is just open with no filter cause I only had one
but since it's out only I think it's fine). I moved the filter to where the intake hose normally connects. I left the charcoal box as is because the lower case needs that line to stay.
Result is that my idle seems to no longer wanders at all (it used to wander maybe 100 RPM or so slowly). My guess is that it's because I am no longer venting any metered air into the VC, and I am no longer sucking blowby into the intake through that line.
Another thought I had was to connect the PCV valve to an external catch can and then open it to atmosphere to reduce pollution and stop oil from getting on stuff haha.
Just for good measure, here's the pic again:
Covert, the only issue I see with your connecting the PCV out and the ventilation to the same line is that you may not be getting any fresh air into the VC then during ventilation. Of course, it's hard to know whether fresh air is really necessary or not. Also, I am not sure you need any ventilation if the PCV is not connected to the intake manifold? No vacuum means the crankcase pressure might be positive 100% of the time, and no air would flow in anyways.
I think both would work just fine most likely, but I prefer to have a close off intake (I am a fan of simpler is better
). Also, closing the intake line will stop blowby gas from gunking up your TB and manifold, as well as make more room for fresh air that will be more useful to your engine.
Of course, going turbo, that article made a very good point in saying that you don't want the intake connected to crank case at all. That had also never crossed my mind.