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Old 01-07-2019, 09:55 PM   #4
blackerst
Scooby Newbie
 
Member#: 422673
Join Date: Jun 2015
Chapter/Region: MWSOC
Location: Rochester, MN
Vehicle:
2003 Subaru Imp. WRX
World Rally Blue

Talking Thanks, I really like my design!

Quote:
This would totally trash the scavenging capacity to the crankcase as the PCV would just suck air out of the inlet tube, being path of least resistance.
I agree it allows air to run from the turbo inlet to the manifold off boost due to path of least resistance. I disagree that crankcase scavenging is worsened given the stock design crankcase breather is T'd with one end going to the turbo inlet and the other to the PCV already, so scavenging off boost is already an issue with stock if what you say is true.

A potential solution I'm also considering to alleviate the inlet to manifold flow during off boost is to put a PCV valve between the turbo inlet and the T to insure gases only flow to manifold PCV when off boost. Though given crankcase is already piped to the PCV and inlet I reasoned there wouldn't be a negative impact to retain the stock path except add in the valve cover breathers.
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