Thread: Cach can, old vs new setup

Hey guys, so I had some great runs at the drags the other day, but was plagued with a blow-by problem. I had a catch can setup on, but I am assuming it was inadequate, soooo I re-did it. Let me know what you guys think and if it all looks setup good.

Old setup: pcv valve was left the stock configuration.




New setup, now has a filter on top and pcv valve now runs to another line I put on and all line were upgraded to 1/4NPT and filter is 1/2 NPT.






Now had car out and ran it pretty hard for a good 4 pulls. Absolutely no oil spray under hood like before. So am assuming it is working great now.

My only question about the setup is that the lil line going into intake stream before turbo, is it going to draw un-metered air from the filter on top of the catch now???? That was my only concern.

Let me know what u guys think, thanks.

Yes, you need to cap the one going to the maf. You are getting unmetered air though from the catchcan. Other than that looks fine.

You could just take that extra line and take the stock black catch can out and put a t-there inbetween the block to valve cover and it would help even more. Use the line that was going to the intake.

Okay, I think I got what you are saying. so basically the bung I had welded on intake pipe b4 turbo is not needed anymore??

And I should take that line and run it to line that would normally go into oil separator and connect those 2 with a tee and then send it back into block without the oil separator. That seem right?

The oil separator between the block and head, just remove it. Get a hose with a T in the middle to attach the hose you have going to the intake to. Cap the bung on the intake where you have the hose at now. Better to loose a bit of unmetered air than to take in unmetered air.

What if I just come straight of v/c to the catch can, cap the tee end that would run to oil separator, then run line that used to go to intake tube to the block opening. That would avoid any tee's anywhere and then it has to run to the catch can before going back to block.

I made a catch can with ABS plastic from Lowes, and used a pcv breather filter before I connected it to to the intake tube

Its been catching the moisture from the valve cover great.

Yeah, that should be fine

I decided to just keep it like I had it in pics and just do away with the line going back into intake tube. Will cap both ends. I think it should be fine. I think biggest problem was the pcv letting air go both ways, hence being hooked up to IM like stock it was letting pressure in v/c, which didn't help anything.

Unless you go VE VC, keep it. That oil separate actually prevents a lot of oil from going into the intake track.



Stuck PCV would cause the crank to get overpressure, so excellent on replacing it. I would get rid of the breather and hook it back up into the intake track (post maf). Under load the turbo will create vacuum needed to suck out the extra pressure from crancase. On my old VE, unless I had the VC line going to the intake, I would get oil splatter everywhere.