Stock Wastegate causing boost issues??? - Subaru WRX Forum
 
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post #1 of 4 Old 11-01-2009, 11:33 PM Thread Starter
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Stock Wastegate causing boost issues???

I have an 04 STi I bought used. It has a downpipe, catback, intake and HKS SSQV. The car was running about about 17 Psi Boost at max boost give or take a pound or 2 for spikes.

Recently the car started acting up. The boost started to intermittently revert back to 10 PSi Max. Now the boost is permanently at max 10 Psi with a bit of a spike to 12Psi at max RPM.

1. Is 10 Psi the stock waste gate setting for an 04 STi?

2. Does anyone know if this is a stock boost stabilizer issue?

3. Has anyone else had the same problem?

I would appreciate any advice............... Thanks!Laugh!
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post #2 of 4 Old 11-02-2009, 12:28 AM
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You may have a boost leak or your wastegate is broken/loose causing your low boost issue.
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post #3 of 4 Old 11-02-2009, 01:06 PM
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+1 to the above mentioned. Check for leaks, and then check the wastegate arm. Make sure the C-clip didnt fall out either.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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post #4 of 4 Old 11-02-2009, 09:51 PM
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10 psi sounds like wastegate pressure on a VF39. Either the BCS is acting up or The ECU has dropped IAM and is running with reduced timing. Without a datalog it will be hard to tell.

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