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Old 03-30-2012, 11:54 AM   #1
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Thumbs down Why am i only boosting 5lbs i replaced-->>

I'm only boosting 5 lbs.
If i bypass the WG, it makes 20lbs. (stg 3 tune) Brew city boost
I was told it could be the BPC (took off cleaned good)
replaced BPC still same effect, only 5 lbs.

What else should i look at that causes this problem?
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Old 03-30-2012, 12:12 PM   #2
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It's the BPC. They fail and this happens. It's pretty much stuck open so whatever pressure you build goes right to the wastegate instead of the BPC holding back the pressure till you reach the right PSI.

If you take it off, and blow into the wastegate hole, air will probably come out another hole. This should not be the case.

Mine has failed, I temp have a MBC hooked up to manage the boost levels till get my T7 BPC all set with an edited tune.
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Old 03-30-2012, 12:54 PM   #3
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i see now.
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Old 04-01-2012, 07:38 PM   #4
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Or it could be bad MOSFETs in the ECU. It will short out BPC's left and right until you replace the BPC and ECU the same time.
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