Originally Posted by Homemade WRX
The older model Peterson cans had been modded and ran large ID lines. If you're still running in series through the Crawford, that might be causing some pressure drop, as may that filter.
Which Peterson can are you on?
What is VTA?..it's early and I'm drawing a blank.
Lol. I'm not actually doing it now. But I was thinking of doing it. Yesterday I had my car vent to atmosphere with a long hose from the top of the AOS to below the car. No connection to intake. Did some pulls and saw smoke at higher pressures.
Precision says if there is positive pressure in the crank case then it will push oil through seals. When I was on the dyno a few weeks ago I got smoke with connections to the intake with heads directly connected to the intake and my crank case through the AOS to the intake. This to me would mean I had negative crank case pressure but the intake was sucking oil out of the heads. I checked the hose from the heads to the intake and there was definitely oil.
Then I saw your recommendation that the heads need to go to a can an not direct to intake since it sloshes. So as of today I have the heads and crank case plumbed to AOS with top going to intake. I'm thinking I want to add the Peterson soon to help keep oil out of the intake but I will check my turbo this weekend to see if I have an oil film at the exit since my headers looked pretty clean.
Thanks guys for the input.