Editing How to install an oil catch can (section)

===Gemi Coupe===

yea, i understand what your saying flubba, But,
What about all the people who move their AFM to just before the throttle? they would have the same running rich unmetered air problem.
I have a o2 display in my dash, and in the last week or so of driving around like this, i haven't noticed it get any richer, couldn't tell you about my fuel economy though, i haven't filled up yet.
Also, with the way its all connected, (dont mind my work of art Roll Eyes)

[[Image:Catchcan09.jpg|400px]]

the catch is sealed off once the PCV shuts, as you said. but the PCV would shut anyway even if the can wasn't there. At that point ANY pressure buildup in a standard setup would simply releive pressure out the rear rocker cover bung, and straight into the inlet. I guess if you really wanted to you could connect that through a seperate catch can to try and filter that too. But in the way its set up on mine, any pressure buildup in the crankcase would force the PCV open and vent through that. In a NA setup, the pressure in the inlet track that would need to be overcome, would be just below atmospheric, so it wouldn't take much at all.
the rear bung sucks fresh air in due to the fact that the crankcase fumes being sucked into the inlet creates a low pressure situation inside the crankcase, Its position for that part of its job wouldn't matter where it is, so long as its sucking clean air.

I can see how it becomes an issue on boost, and im still thinking about how to overcome that. A solution will come to me soon. maybe i'll trim down the dipstick seal, and use it as a 'saftey valve'
However as a point of note, how long in street conditions do you stay on boost? a few seconds? then change gear and the PCV opens, then a few more seconds, then change gear and the PCV opens, then cruise coz your at the speed limit and the PCV stays open.
when you look at the design of the valve, and the 'general' driving conditions your engine would encounter on the street you'll notice that the valve actually stays open for a very large range of driving conditions.