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Old 12-22-2015, 12:29 AM   #1
RallyBlueSubaru
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Member#: 371569
Join Date: Oct 2013
Location: Bartlesville, OK
Vehicle:
2002 Impreza WRX
WRB

Default Underboosting on stock ROM (Log Review)

I recently gained the ability to datalog my car. It is a 2002 WRX with a 2004 WRX shortblock and a full catless exhaust on the factory tune and stock O2 sensor.

I've been experimenting with 20% E85 and quickly noticed that my IDC's were hitting 97% when the temperature was 40*F. Then I filled up on 91, and the IDC's dropped below 90%. All of the logs you will see here are on 5.5% E85.

The car is having an issue hitting the target boost of 13.61 psi. It tends to peak at around 9.5 psi and the Turbo Dynamics Continuous appears to be doing everything it can at 3.14% with a WGDC of 69% at peak boost (which is on target according to the map). The fact that this is the stock tune leads me to believe it is a mechanical issue. Can anyone review my logs and give me a new perspective of the data?

This is a typical datalog of the car in 3rd gear:
https://drive.google.com/file/d/0B11...ew?usp=sharing

This one is a log of more fueling/airflow related parameters in 3rd gear:
https://drive.google.com/file/d/0B11...ew?usp=sharing

I hope you all have a Merry Christmas!

-Eric
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Old 12-22-2015, 02:02 PM   #2
quazimoto
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Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Do a boost leak test. Check the wastegate vac lines for the restrictor pill.
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Old 12-23-2015, 05:01 PM   #3
SkateAndDestroy
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Join Date: Dec 2006
Chapter/Region: Tri-State
Location: Red Bank, NJ
Vehicle:
JBP 04 Forester XT
PSM 02 WRX Wagon

Default

I didn't look at the log but these threads come up a lot with the 02-03 wrx's not hitting target boost...If its not a boost leak like mentioned above, its usually the boost control solenoid that needs replacing.
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Old 12-24-2015, 05:51 PM   #4
RallyBlueSubaru
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Member#: 371569
Join Date: Oct 2013
Location: Bartlesville, OK
Vehicle:
2002 Impreza WRX
WRB

Default

Thank you both for sharing your knowledge. When I put the motor in I had the vacuum lines flipped at the turbo so that the restrictor pill was on the wastegate side of the t-fitting. It took about 10 minutes to check it, correct it and reset the ECU.

The car boosts great now, I can't believe I was unaware of this for 10,000 miles.
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Old 04-12-2016, 03:47 PM   #5
06wagggon
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I was going to say restrictor pill, glad you got it figured out.
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