Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - SR Owners... More HP Easy Mod... Catch Can Setup

slider2828 · 01-27-2009, 10:12 AM

Ok... pics will be up one day late.... cause I was just too tired while putting on the valve cover and intake stuff back in. Was testing the setup for best results.....

So far with nothing changed except welding bung for pulling in vacuum from the catch can....

So here is a brief description of the setup....

First Phase
Blu808 welded a 90* AN fitting to the top of the valve cover and replaced the T with a 90* AN fitting as well. The AN fitting on top of the valve cover is right next to the words TWIN CAM 16VALVE right next to the "E". We modified the baffling in the valve cover to allow it to "breath" easier and suck gases from the blowby better. So from the crankcase, it goes directly into the 90* fitting that used to be the T. Then from the top of the valve cover 90* it is piped down into the catch can and the catch can to open air. Just this mod eliminated blowby and any oil into my catch can on the track. I had 0 drop of oil in the whole track section and the car felt good....

Second Phase
We finished it last night, because my Alu pipe from PipingPro didn't have a recirculate bung (BOV is circulated though), cause I didn't ask for it for the valve cover, we had to remove it and weld a bung. So now instead of having the open air side of the catch just open to atmosphere, we basically piped it back into the intake now, so the catch is a completely closed system. This part is tricky, because right now at idle it pulls about .6 more PSI at idle based on my Profec-E01 Digital gauge and idles a little higher around 100 RPM higher. From my experiences this messes with the boost settings a little when the base PSI changes a little. It is immediately noticeable that start-up is much easier and reduction in cold start RPM fluctuations which I was getting is basically gone. Now I can't tell too much yet as I haven't really driven on it except to work which is a traffic commute but when I get off work, I can drive it with a little more open road and fix my idle a little more.

Like I said pics up tonight.... But you get the idea

01-27-2009, 10:12 AM	#53
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 5,998 Trader Rating: (13)	Ok... pics will be up one day late.... cause I was just too tired while putting on the valve cover and intake stuff back in. Was testing the setup for best results..... So far with nothing changed except welding bung for pulling in vacuum from the catch can.... So here is a brief description of the setup.... First Phase Blu808 welded a 90* AN fitting to the top of the valve cover and replaced the T with a 90* AN fitting as well. The AN fitting on top of the valve cover is right next to the words TWIN CAM 16VALVE right next to the "E". We modified the baffling in the valve cover to allow it to "breath" easier and suck gases from the blowby better. So from the crankcase, it goes directly into the 90* fitting that used to be the T. Then from the top of the valve cover 90* it is piped down into the catch can and the catch can to open air. Just this mod eliminated blowby and any oil into my catch can on the track. I had 0 drop of oil in the whole track section and the car felt good.... Second Phase We finished it last night, because my Alu pipe from PipingPro didn't have a recirculate bung (BOV is circulated though), cause I didn't ask for it for the valve cover, we had to remove it and weld a bung. So now instead of having the open air side of the catch just open to atmosphere, we basically piped it back into the intake now, so the catch is a completely closed system. This part is tricky, because right now at idle it pulls about .6 more PSI at idle based on my Profec-E01 Digital gauge and idles a little higher around 100 RPM higher. From my experiences this messes with the boost settings a little when the base PSI changes a little. It is immediately noticeable that start-up is much easier and reduction in cold start RPM fluctuations which I was getting is basically gone. Now I can't tell too much yet as I haven't really driven on it except to work which is a traffic commute but when I get off work, I can drive it with a little more open road and fix my idle a little more. Like I said pics up tonight.... But you get the idea __________________ Turn and Burn! Last edited by slider2828; 01-27-2009 at 10:33 AM..