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Old 11-10-2014, 03:55 PM   #1
Scoobs17
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Member#: 325965
Join Date: Jul 2012
Chapter/Region: South East
Location: Melbourne, FL
Vehicle:
2002 WRX Wagon
Silver

Default EJ207 V7 low compression, please help!

Hey guys, I've spent the last day or two researching the forums and haven't been able to really come across a clear diagnosis for what the problem might be with my 207.

I've been running an EJ207 V7 setup for a little over a year now in an 02 WRX with JDM ECU. Recently, the car was struggling to reach boost over 8-9 psi. Obviously something wasn't right since normal boost range is 18-19 psi.

At first I thought it was just a boost solenoid issue or vacuum leak somewhere, but after testing I found nothing. Pulled the plugs from the motor, did a compression test and found that cylinders 2 & 4 were at 115PSI with 1 & 3 at 130ish PSI. The motor still runs fine, sounds fine, just will not build boost.

My friend told me it could be possible ring land failure but since I saw no oil on the plugs I am hoping its not. Maybe the top ring land and bottom is still intact?

Any advice? Going to do a leak down test tonight to learn more just wanted any opinions/help possible.

Thanks!
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Old 01-20-2015, 07:23 PM   #2
babaganush
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Member#: 336122
Join Date: Oct 2012
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motor is probably fine and you have a boost leak..
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Old 05-18-2015, 11:52 PM   #3
04wrbscooby
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Member#: 369079
Join Date: Sep 2013
Chapter/Region: BAIC
Location: Modesto CA Usa
Vehicle:
2004 Wrx sti
Wrb

Default

Sounds like somebodys missing the wastegate restrictor pill......
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