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Old 02-07-2013, 10:34 PM   #1
JayTeeEye
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Member#: 346332
Join Date: Feb 2013
Default 02 WRX Boost Dropped

This is my first post on NASIOC so bear with me. I have a 2002 Subaru WRX, pretty stock except for:
- K&N Cold Air Intake
- Vishnu Sub Zero ECU
- Stock Turbo
- Stock Exhaust
- No BOV
I usually have my turbo at 7psi. This is how i bought the car, I haven't messed around with the ECU yet. I've never had any problems with the turbo, it's always been consistantly running 7psi without drop offs. But today the boost would only go up to 4psi. When I was WOT it would stay at 4psi and it wouldn't taper off. Idle is around 10 hg. When the rpm's get up to around 3200, i hear a high pitched whistle (not the regular turbo spool, it's a different noise). Also, this is a daily driver, so considering that most mechanics are closed on the weekend, is it bad if I continue to drive it until i can take it in, or will i damage the turbo? Please help me try to diagnose this so i can relax a little
Jesse
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Old 02-08-2013, 10:33 AM   #2
GrimmSpeed
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Join Date: Jan 2007
Chapter/Region: MWSOC
Location: Minneapolis, MN
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2013 BRZ
SWP

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Hey Jesse,

How many miles are on the car? do you have any check engine lights?

Mike
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Old 02-08-2013, 11:43 AM   #3
HinshawWRX
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Location: Common Sense, VA
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GT3 (Currently on Fire)

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Sounds like you have a boost leak.

That being said, 7 psi is WAY TOO LOW for stock. You should be making 12-14 psi stock, so there has been a bigger problem for awhile. Along with that, the VISHNU ECU might be hurting your car severely.
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Old 02-09-2013, 11:02 PM   #4
JayTeeEye
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Default

137xxx and no check engine lights. I think my boost control solenoid might be messed up. I'm gonna try going with a 3 port solenoid with a tune, and i'll see what happens. I'll get the boys at me local Vex performance shop to take a gander at it.
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Old 02-09-2013, 11:54 PM   #5
wrx1392
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Location: tehachapi Ca.
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2003 wrx
blue

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i would bet money the stock tubo to TMIC hose has a split in it ,and your turbo hoses to your EBC is not right ...7psi is the sring pressure in the waste gate actuator. agreed you should be getting 10 -12 psi in stock form.
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Old 02-10-2013, 12:20 AM   #6
BadSubie123
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Location: Dickson, TN
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2002 Impreza Wrx
Rally Blue

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Glad I read this. Having the same issue with only mod a drop in filter

Last edited by BadSubie123; 02-10-2013 at 06:15 PM. Reason: Unclear sentence
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Old 02-11-2013, 06:22 PM   #7
JayTeeEye
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Yeah, 7 psi is the wastegate pressure so im not sure what the problem is. I took it in to a shop and they said that after basic diagnostic testing, i don't have a boost leak because it holds the vacuum as it should, the only problem is not reaching peak boost. They said they can probably find out what's wrong with it by tomorrow. And BadSubie, I'll let you know as soon as i do.
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Old 02-11-2013, 06:37 PM   #8
DZXN
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PSM

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Do you know what vac your car should be sitting at idle? Mine sits at 16-18inHg @ 4500 feet. Might want to do a real boost leak test. Is your local shop a Honda/all other JDM shop? Search DIY boost leak test and spend $20 at the hardware store. If they didn't pressure test you have no idea if you are leaking or not. Or find a Subaru shop to have the test done.
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