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Low boost with my sc

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Old 08-07-2007, 03:00 AM
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Default Low boost with my sc

From what i have been reading i think my stock boost level should be around 5
Plz correct me if i am wrong
But i am only showing about 2psi
Any suggestions would be helpful
(94 bonneville ssei)
Old 08-07-2007, 04:44 AM
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hmmmm.

I believe that the stock boost should be around 8 - 10 PSI at wide open throttle. I know that on my '93 SSEi, when I floor it, the boost hits around 9 PSI at about 5000 RPM.

If you are showing only approximatly 2 PSI at wide open throttle, I would say that something is wrong for sure. What would be wrong, I myself could only guess at, but I am sure that one our resident gearheads will probably chime in soon in and explain any possible problems.
Old 08-07-2007, 05:36 AM
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I had a similar issue, it sounds like your Boost Control Actuator might be bad. Could a gearhead verify that?
Old 08-07-2007, 05:38 AM
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on my way home from work today, my sc started making a lot of unusuall noises
i think i may need to rebuild it, i will see if i can get a video of the sound
Old 08-07-2007, 05:39 AM
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i dont get above 0 until im at like 2800rpm
Old 08-07-2007, 05:40 AM
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noise is not a good sign. have you checked the */c oil lately?
Old 08-07-2007, 06:25 AM
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i just got the car like 3 days ago, so no
Old 08-07-2007, 07:24 AM
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Please describe the sound.
Old 08-07-2007, 08:37 AM
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Bad bearings and/or a coupler don't reduce boost. It'* either a vacuum leak at the BCS/BCA, a bad BCA or BCS, or a sticky bypass valve.

We'll start with the sound and go from there. You should be getting 7-8 psi stock on a 94/95.
Old 08-07-2007, 10:28 AM
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Where are you located? Someone nearby may be able to stop by and take a look.


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