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Old 11-18-2012, 05:49 PM   #1
glepko
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Member#: 19651
Join Date: Jun 2002
Location: PA
Vehicle:
2002 WRX
Silver

Default over-boost troubleshooting

02 WRX, catless exhaust, AP Stage II tune, 140k. Sudden onset of over-boost.

Noticed car was pulling quite strongly in 4th/5th on a joy ride two nights ago, then on next WOT run through 3rd at about 3500 RPM suddenly felt a drop of acceleration that improved again after 4600ish RPM. Best way I can describe is as if the vehicle was suddenly several thousand pounds heavier.

Backed out and babied it home for the night. Plugged in Accessport next morning to monitor on a drive. Saw over 20psi of boost in 1st and 2nd with no power loss, 3rd gear responded same as prior night (also hit over 20psi). Remapped to economy mode and kept under 3k RPM since.

Checked lines to wastegate and BCS today and found no "apparent" defects. Wastegate arm is not stuck nor moving with too little effort. Tried a different BCS from a forumite's parts car and did not correct the overboost or power drop.

What is a good logical next thing to examine or consider as possible cause???
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Old 11-18-2012, 09:11 PM   #2
mod maniac
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Join Date: Nov 2011
Chapter/Region: SCIC
Location: mariposa ca.
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2&4 fxt & fxt sti
Fullers Garage

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Use a vacuum pump on the wastgate actuator and make sure it is good.
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Old 11-18-2012, 11:07 PM   #3
glepko
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Member#: 19651
Join Date: Jun 2002
Location: PA
Vehicle:
2002 WRX
Silver

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Quote:
Originally Posted by mod maniac View Post
Use a vacuum pump on the wastgate actuator and make sure it is good.
ok. have a tutorial link?
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