Krank vents rely on pressure vacuum to open/close to prevent oil entering the intake while the catch can uses gravity to capture the oil before it reaches the intake. So it's generally either krank vents or a catch can. No reason to do both since they accomplish the same thing in different ways.

The filter is mandatory if you open up the system to prevent the oil from getting contaminated by dust, sand etc... you "can" run it to open air, but no reason to.

 

So if i run just the small krank vent and the filter on the end of the rear vc i should not cause vss to leak. The Rear Vc is where air is sucked into that system them correct?

 

here's the diagram...

Keep in mind the air flow reverse... so its in to the front VC to Back VC then to intake. If you choose to run a filter, it's on the end instead of routing back through the intake...

 

I have mine set up like this:

I have a small KV for the rear VC > OCC > intake bubble and a bigger one that replaces the PCV on the front VC. And yes i know the hose is too long lol.

 

So id be fine either running rear vc to occ then to bubble or u can Run Rear Vc to Air filter plug up intake bubble And neither of these cause Valve steam leakage cause of less vacuum?

 

If your engine is healthy, I don't see why there would be any problems by going with either method. If you have tooooo much oil going into your rear pre-turbo pipe/intake bubble then you might have an underlying problem.

 

There was very little oil in the rear turbo pipes. There was no oil in the Y-pipe i havent checked my pre turbo for rear. But heres a video of the puff smoke i get running 18psi or so holds like 16psi too redline

https://www.youtube.com/watch?v=KzrH...ature=youtu.be

i just wanna take care of that i also been getting oil coming out of my oil cap hence why i went and bought the krank vents, Ive also been told not to run the rear big crank vent cause it causes u too pop your dip stick out.

 

I've got a pretty custom PCV setup so I'll just throw my setup out there.

Passenger side is Teed together from the valve covers then goes to a small Moroso Catch Can then a Dual Adjustable Billet Inline PCV to a Krank vent to the lower intake manifold. (Idle/Cruise).

Each drivers side valve cover outlet has its own 1/2" hose to its own Large Moroso Catch Can (2 of these) then one goes to the front pre turbo pipe and the other to the rear (Boost).

I used the other Krank vent as a check valve for brake/clutch boosters.

Not sure if you saw this but I'm liking my setup thus far. Keeps everything nice and clean. definitely a bit overkill, but it might give you some ideas. I like to have a catch can for vacuum and one or more for boost operation when in a stock like config.