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

gopsu · 06-14-2006, 05:14 PM

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

AP VF34 map
VF34 ported
JDM STi TMIC
Perrin turbo inlet
Borla header
catless TBE
Uppipe
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.

parker/slc/gc8fan · 06-14-2006, 05:18 PM

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.

dvang · 06-15-2006, 03:40 AM

over ported turbo, pre turbo exhaust leak, or weak wastegate. try a helper spring and check for leaks

benw · 06-16-2006, 01:47 AM

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.

06-14-2006, 05:14 PM	#1
gopsu Scooby Specialist Member#: 96448 Join Date: Sep 2005 Chapter/Region: Tri-State Location: NY Vehicle: 02 WRX VF34	Stage 4 hitting just 12psi in 4th gear... My friend recently upgraded his stage 2 WRX to stage 4. AP VF34 map VF34 ported JDM STi TMIC Perrin turbo inlet Borla header catless TBE Uppipe 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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06-14-2006, 05:18 PM	#2
parker/slc/gc8fan Scooby Specialist Member#: 46241 Join Date: Oct 2003 Chapter/Region: RMIC Location: N. Salt Lake City, UT Vehicle: - RIP SDF-1	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.

06-15-2006, 03:40 AM	#3
dvang Scooby Specialist Member#: 84188 Join Date: Mar 2005 Chapter/Region: MWSOC Location: its too cold Vehicle: 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

06-16-2006, 01:47 AM	#4
benw Scooby Specialist Member#: 103320 Join Date: Dec 2005 Location: Oklahoma City Vehicle: 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.