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Old 04-24-2011, 01:28 PM   #1
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Cool lack of boost.

Hi I have a 96 sari bonneville with a 3.4 pulley. My problem is it pulls about 9-12 lbs of boost when the motor is cold but when it gets up to normal temp it only pulls a max of 5lbs if boost. Any segestions?
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Old 04-24-2011, 01:38 PM   #2
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Check the vacuum line connections, like under the supercharger snout on the LIM. Make sure the T isn't cracked.
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Old 04-24-2011, 02:12 PM   #3
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Sometimes it is hard to tell if they are cracked. Wiggle them a bit and see if they disintegrate in your hand = P This is what I would check first as well.
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Old 04-24-2011, 02:20 PM   #4
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All vacuum lines and elbows good.
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Old 04-24-2011, 02:34 PM   #5
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Does the boost control actuator move?
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Old 04-24-2011, 02:36 PM   #6
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Yes free and smoothly open and alaway closed
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Old 04-24-2011, 02:45 PM   #7
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Do you notice a lose in power when it'* hot? I wonder if there'* a problem with the supercharger rotors.
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Old 04-24-2011, 02:54 PM   #8
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Yep after it warms up and I've driven it a while it slowly looses boost
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Old 04-24-2011, 03:47 PM   #9
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Can I replace it with a gen 5. Supercharger?
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Old 04-25-2011, 10:30 AM   #10
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You can. I'd suggest figuring out the issue first though.

Likely you are getting KR. KR is knock retard, it is the pcm pulling timing, dumping boost etc to save the motor from predetonation.

Beyond the 3.4" pulley, what other mods do you have?
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