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What boost level do I have?

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Old Apr 17, 2011 | 08:36 PM
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From: Carl Junction, Mo.
Default What boost level do I have?

I have an 02 zo6 with stock ls6 with a vortec sq supercharger with a 3.8 pulley. I was told it was tuned on 8-9lbs of boost but the gauge is only showing 6. Can anyone help me find out if I need to start looking for a leak or just maybe it is only supposed to be 6. Thanks
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Old Apr 17, 2011 | 09:18 PM
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Check to make sure you have a clean filter and then check for leaks.
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Old Apr 17, 2011 | 09:26 PM
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I have checked the filter and it looks very good. So is 8-9 lbs where it should be with this pulley. I did forget to add that it has kooks LT headers and straight pipes which might effect the flow, right? I'm new to the FI world but doing lots of reading.
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Old Apr 20, 2011 | 06:13 AM
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How much boost the blower can produce depends on many variables.
* Cubic inch. The larger the engine the less boost it will make with a supercharger.
* Headers and exhaust. A better flowing system will produce less boost, requires a smaller pulley to regain the loss in boost. Ultimately though, more power will be gained.
* Camshaft and heads. A camshaft with some overlap will leak out some boost through the valves. Better flowing heads react a lot like a better flowing exhaust system.
* Altitude. Elevation plays a big part in how much boost is produced. Those people living in the higher elevations have to spin the blower harder to see boost.
* Condition of engine. An engine with real good sealing rings will ultimately produce more boost than one with worn rings.
* Rpm. An engine that is spun up higher in the rpm range will normally produce more boost.

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Old Apr 20, 2011 | 06:52 PM
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Thanks guys. I think the less boost is a result of headers and exhaust. I am going to check for leaks though and then probably look at getting a smaller pulley to get it back up. Any advice on checking for leaks. Just soap and water?
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Old Apr 20, 2011 | 10:26 PM
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also make sure the belt isnt slipping. some blowers will hit a boost level and stay there, usually means your belt is sliding
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Old Apr 22, 2011 | 09:10 PM
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Originally Posted by cjmatt
also make sure the belt isnt slipping. some blowers will hit a boost level and stay there, usually means your belt is sliding
How can I check this? Just check the tension?
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