So in my studies of designing the catch can for my car there are two main ways to do it
1. Vented surge tank
Basically just vent the valve covers to a tank and the tank has some type of a filter on the top to atmosphere , some have vacuum source to manifold and some don't
2. In line oil separator
Essentially a copy of a factory PCV system but with a tank in the middle to separate the oil mist from the air.
1 isn't wrong but I MUCH prefer 2. There is improved ring sealing from a slight vac on the crank case and you are actively removing water vapor and blowby from the crankcase. #1 is essentially just putting a second, filtered air bleed to manifold and any blowby ends up in the tank passively not actively.
Mine is set up with the stock valvecover barb going to a tank that is filled with steel wool and has a copper tube on the inlet going to the bottom and it has a few holes drilled down the side on the bottom half. The outlet going to manifold vac then has a PCV valve in line before it connects to intake vacuum. If you can tell in the photo below the black tank is mounted right infront of the passenger head.
Since you are turbo look at how a turbo buick is set up. You should tee off the post air filter, pre turbo side of the inlet pipe to provide a little vacuum under boost and possibly put some check valves in and send the other side of the vac supply side of the can to the intake manifold post TB.
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