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03-04-2021, 02:35 PM | #26 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Fairly normal for low load/idle on the exhaust side. I see it used more when VTA is not allowed and the AOS or catch can being used is garbage. 10+ years ago it was more common, but not nearly as much anymore. We know more now than we did then
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03-05-2021, 01:13 PM | #27 |
Scooby Specialist
Member#: 179846
Join Date: May 2008
Chapter/Region:
NWIC
Location: Renton, WA
Vehicle:07 STi Limited EFR 8474 TS EWG |
Probably best solution here would be to have mechanical pump, and mount it in tranny bay area, and drive it from crank shaft rotation.
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03-06-2021, 01:01 AM | #28 |
Scooby Newbie
Member#: 196882
Join Date: Dec 2008
Chapter/Region:
MWSOC
Location: Holset baller on a budget.
Vehicle:08 WRX |
Exhaust scavenging works. How well is debatable, but proper plumbing and execution make all the difference. The one-way valves the cheapo kits come with are trash and easily replaced with much higher flowing valves with very low vacuum required for opening. I have no reversion issues with 272 cams. Certainly better than VTA, and when used as a part of a system that employs a vacuum pump, and condenser/oil separator it works great. I did it simply because I was sick of smelling my crank case after a hard pull (beats a draft tube/VTA). I had no expectation of pulling any measurable vacuum, just wanted to keep vapor moving while the pump was not engaged.
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03-06-2021, 05:49 PM | #29 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
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