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Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 11-04-2005, 02:12 PM   #1
Darrel
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Ok, simple question to expand my knowledge... What do the numbers on the gauge for the "boost" stand for... (like the tach is Rev per min, and spedo is mile per hour...)
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Old 11-04-2005, 02:14 PM   #2
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pounds of boost..
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Old 11-04-2005, 02:17 PM   #3
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so when the car is at idle it is at -10 pounds of boost...??? does that mean that the supercharger is restricting the engine?
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Old 11-04-2005, 02:20 PM   #4
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pounds of boost was a guess

a wise man once said:

Basically, at 0, it means that the pressure in the lower intake is even, meaning that the SC is feeding air at the same rate that the engine is pulling it.

In a naturally aspirated engine, there is always vacuum, as the engine pulls the air in rather than being fed. Basically, it would always read negative pressure (vacuum).

In the SC'd car, it is unecessary at idle/low rpm'* for the engine to be constantly fed air. The engine can pull it fine.
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Old 11-04-2005, 04:17 PM   #5
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ah ok. i see what your getting at. Never owned a supercharged engine or knowen anyone who has. thanks for your help!
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Old 11-05-2005, 02:22 AM   #6
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any negative numbers simply stand for Intake Maifold Vacuum, the ammount of Air going into the engine at a non charged rate. as soon as you pass the 0 you start boosting, so along with all the manifold vacuum you are pounding up to an additional 9 lbs of air inside of it.
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Old 11-05-2005, 12:10 PM   #7
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Air pressure in the intake manifold relative to ambiant air pressure.
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