I recently purchased a twin turbo z about 6 months ago with APS base kit on it. Car is in really good condition and compression and everything was spot on. The previous owner had a cheap ebay vented catch can with no baffling so I decided to change it to a mishimoto non vented can. The car started burning oil like crazy and two days after installing the new catch can I burned 2 quarts of oil. Any ideas on what happening?

This is the one I installed: http://www.mishimoto.com/mishimoto-a...catch-can.html

 

Add a breather to your new catch can

 

Where are you drawing vacuum from? You do realize you cannot hook up to the intake manifold since that sees boost. Pressurizing crank case with no breather so oil being pushed out through turbos, likely on intake side (messy!) and exhaust side. You can draw vacuum from turbo intakes but obviously that requires some modification to the piping (bungs). Easier to just do what the above post indicates and go back to an open breather.

 

What he said. Manifold pressure in the crankcase is a no no.

 

Yea i tried re routing mine once and it burned tons of oil too. I didnt have a vented catch can so it didnt work. Changed it back and it has been fine.

 

Either needs a check valve so it only see vacuum or need to be plumbed in before the turbo.

 

Here's a quick diagram of how I routed my catch can, I'm not sure if it was routed correctly...