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Old 06-14-2006, 05:14 PM   #1
Scooby Specialist
Member#: 96448
Join Date: Sep 2005
Chapter/Region: Tri-State
Location: NY
02 WRX VF34

Default Stage 4 hitting just 12psi in 4th gear...

My friend recently upgraded his stage 2 WRX to stage 4.

AP VF34 map
VF34 ported
Perrin turbo inlet
Borla header
catless TBE
Stock intake
Stock T-hose and "pill" from TD04

Now, problem is that he's only able to hit 12psi at max... that's what's read on AP live meter and defi boost gauge. Can someone point to where he should look as far as fixing the boost problem? He doesn't hear any whining or high pitch sounds which would point to potential leak problem...

Your help is appreciated.
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Old 06-14-2006, 05:18 PM   #2
Scooby Specialist
Member#: 46241
Join Date: Oct 2003
Chapter/Region: RMIC
Location: 4401 Procorpio Dr.


I'd point him to a protuner to have a custom map made for those extra parts he's running. Unless he wants to take them off and get back to Cobb's spec.

He'll make more power with a tune, way more.
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Old 06-15-2006, 03:40 AM   #3
Scooby Specialist
Member#: 84188
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: its too cold
05 legacy
caravan full of kids now


over ported turbo, pre turbo exhaust leak, or weak wastegate. try a helper spring and check for leaks
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Old 06-16-2006, 01:47 AM   #4
Scooby Specialist
Member#: 103320
Join Date: Dec 2005
Location: Oklahoma City
2005 wingless
aspen white


data log. see if your ECU is hanging the WG open at 100%. I'd bet on a boost leak somewhere. See the EM forum sticky's for the DIY leak finder.
benw is offline   Reply With Quote

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