Well people I have had my Twin Turbo HR for about 5 months already but only 900 miles on the build. Yesterday I dropped my phone under the car I the garage, and as I reached for my phone I noticed the under carriage was wet. So touched it and it was oil, I put the car on Jack stands and removed the front bumper and Z speed shield and started cleaning everything to look for leaks. I found nothing!!! I looked inside my oil catch can and found not one single drop of oil I there!!! 😁😁 so I follow both hoses that go into the catch can and they both go to the PCV valves on the valve covers and that's it, I believe the catch can is done wrong what do you guys think and where else does it need to have hoses to go to the catch can. Because it is coming out but messing up all of my passenger side undercarriage. Anyone with VQ35HR catch can experience I need help.

 

So you're catch can is going PVC-Catch-PVC? You need a vent to atmosphere

 

There are 2 hoses going to the oil catch cat and each hose goes to each valve cover PVC connection

 

^^^

 

There is a K&N filter on the catch can if that's what you mean....
There on the bottom right

 

Well the master tech said that we need to remove the PCV valve because it's got a check valve preventing the vapors to come out. So we need to replace it with a flow through PCV valve. Sink went ahead left my car there and going to have them up the boost a bit to hit 1000whp and get this Z over with already. The oil under the car was due to one of the passenger side turbo oil lines.

 

There is a huge catch can thread. If you don't mind the vapors at stoplights, through AC etc, then a breather like you have it is best. Your tech is correct, PCV should be drilled out so just a nipple there. I actually have center hose bridging valve covers also feeding catch can (as Dynosty measured crankcase pressure under boost and felt it was necessary). I do not have a breather - output is to turbo intakes via 10 an lines. Works well - catches water and fuel vapor with an oily film.

GL on the dyno!