Question about catch can, st205 Options

[CELL_PROTOTYPE_X]

I'm looking to get some new fittings and plan on running a catch can, but I first have a question. (See pic below) I'm wondering if I can run both lines pictured to one can, and just have one out to my turbo inlet pipe. I'm not exactly sure what the line coming off the throttle body is for...referencing my manual I believe it just says "air hose". It's currently run to my turbo intake so I imagine this would be an ok solution. Any info is appreciated.

Thanks in advance!

[CELL_PROTOTYPE_X]

Anyone?

[Nial]

The line from the throttle body is the air supply when you are on zero throttle so that needs to come from some form of filtered air, ( you should be able to hear it sucking in air on tick over if you disconnect it from the filter) you should not run it through a catch can or need to as it's just sucking in fresh air. The other line from the rocker cover can be run through a catch can if you want.

This post has been edited by Nial: May 30, 2015 - 12:16 PM

[CELL_PROTOTYPE_X]

Thanks Nial! Exactly the info I was looking for.

[Sunny]

Hi,

not good, in the air out of the engine is a lot of oil mist, thats why you should run a catch can between engine and fresh air to the turbo

your engine looks a little modified so you better went the oil mist just in an catch can with a filter with no connection to the turbocharger, that oil has a negativ effect to the knock level of the fuel/air mixture

the line fron the turbo pipe to the throttle body goes to the iscv

greetz

[CELL_PROTOTYPE_X]

Thanks Sunny. The engine is fully built. I'm actually in the process of breaking it in before taking it to get tuned. So you're recommending just running a catch can with no return to the intake on the turbocharger? Since that other line is just sucking clean air(iscv), can I run that to a separate can with a filter on it with no need to route it to the turbo intake as well? I'm just thinking of ways to clean things up a bit.

[Nial]

The inlet to the throttle body needs no catch can, it would be a complete waste of space as fresh air contains no oil mist. I just run a short length of pipe with a filter on the end, that's all you need.

If you really want to minimise things, just put a filter directly onto the rocker cover, if you aren't going to route it to the turbo Inlet there's no need for a catch can. It does help to have a little bit of "suck" to help reduce moisture build up in the rocker cover.

[Sunny]

Hi,

np, i would built the system like

- crankcase system, connected to a catch can with a air filter free in the engine bay (no return to the turbo)
-> better knock resistant, cleaner ic

- iscv, connectet to the pipe before the throttle body ( intercooler to throttle body )
-> there you have fresh air and you also be safe of an possible boost leek over the iscv

nials idea is also a option, but on my engine and car i have fuel smell in the car by that, when i activate the fresh air fan

greetz

This post has been edited by Sunny: Jun 1, 2015 - 8:12 AM