This is topic HOW DO I FIND OUT HOW MUCH PSI I AM RUNNING IN MY SUPERCHARGER in forum Tech Talk at Northern California Ford Owners .
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Posted by 96cobra/svt (Member # 4240) on
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IS A VORTEC SUPERCHARGER IN A 96 COBRA
WHEN I AM IN NEUTRAL WITH THE CAR IN IDLE WHAT SHOULD MY BOOST GAUGE BE AT?
Posted by wilit (Member # 3367) on
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You should be pulling a vaccuum at idle. Something like -5 to -10 psi.
Posted by 98slowhoe 'FIFTYLX' (Member # 895) on
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This is what you need to figure that out 
Posted by Fostang (Member # 3752) on
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You should not be making any boost at idle.
Posted by FasterDamnit (Member # 442) on
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quote:
Originally posted by wilit:
You should be pulling a vaccuum at idle. Something like -5 to -10 psi.
Make that -5 to -10 in Hg (inches of Mercury.)
Posted by 96cobra/svt (Member # 4240) on
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so if my car is reading -18 vac. my car is really out of tune
Posted by 2stangs69-91 (Member # 1951) on
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no it means you don't have much of a cam(cams) in there and it pulls good vacuum. Having alot of vacuum is a good thing
Posted by Blu50Stang (Member # 489) on
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At idle, you should be seeing vacuum around 17-19 in Hg.
Posted by wilit (Member # 3367) on
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quote:
Originally posted by FasterDamnit:
Make that -5 to -10 in Hg (inches of Mercury.)
Whoops. That's right.
Posted by 96cobra/svt (Member # 4240) on
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thanks
Posted by NO MANRZ (Member # 566) on
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Normal vacuum on 4 valves is around 23-18 inches.
You can't get boost in the driveway reving the motor because you have no load on the engine.
Posted by 96cobra/svt (Member # 4240) on
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how do I find out find out how many psi I am running
size of the pulley?
Posted by AJBlackGT (Member # 3936) on
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Did you not read the entire post or something? You need a boost gauge, and you need to go out and drive it to see how much boost you are making, there are more variables than the size of the pulley.
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