Boost and Vacuum Levels?? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-16-2006, 04:37 PM   #1
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Default Boost and Vacuum Levels??

On the stock boost guage it nevers seems to go back to 10lbs Vacuum after installing 3.4 pulley. I just wanted to make sure that is ok? It seems to be about 8lbs at idle.
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Old 10-16-2006, 05:07 PM   #2
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Typical this time of year with cooler/denser air. Your pulley at idle is producing more boost than the bypass can handle.

Summer time you'll see it go back to normal levels.

Wait until you go smaller. On the hottest days with my 2.0", I produce boost at idle at all times.
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