Need help with my turbo gauge
May 2, 2009, 04:19 PM
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Need help with my turbo gauge
Ok so I just got my Defi racer boost gauge and installed it, but now my car reads at 15 inhg, whatever that means. I'm pretty sure it should be 0 at idle. Any Ideas of what it could be? By the way, I put the T fitting inbetween the BOV and my boost control. 
May 2, 2009, 05:36 PM
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There are 2 different ways that people describe pressure in the automotive world, Absolute Pressure and Gauge Pressure.
Absolute Pressure is a scale in which 0 is complete lack of pressure (ie outer space). Engineers mainly use this scale for accuracy purposes.
Gauge Pressure is the most common usage of the term pressure. 0 refers to whatever atmospheric pressure is at the time and place of where ever you are measuring (roughly 14.7 at sea level).
The 15 inhg (inches of Mecury) you are reading on your gauge, refers to the difference in pressure from your intake manifold (14.7psi) to your combustion chamber as the piston draws down the chamber and the intake valve opens.
Absolute Pressure is a scale in which 0 is complete lack of pressure (ie outer space). Engineers mainly use this scale for accuracy purposes.
Gauge Pressure is the most common usage of the term pressure. 0 refers to whatever atmospheric pressure is at the time and place of where ever you are measuring (roughly 14.7 at sea level).
The 15 inhg (inches of Mecury) you are reading on your gauge, refers to the difference in pressure from your intake manifold (14.7psi) to your combustion chamber as the piston draws down the chamber and the intake valve opens.
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May 2, 2009, 06:44 PM
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There are 2 different ways that people describe pressure in the automotive world, Absolute Pressure and Gauge Pressure.
Absolute Pressure is a scale in which 0 is complete lack of pressure (ie outer space). Engineers mainly use this scale for accuracy purposes.
Gauge Pressure is the most common usage of the term pressure. 0 refers to whatever atmospheric pressure is at the time and place of where ever you are measuring (roughly 14.7 at sea level).
The 15 inhg (inches of Mecury) you are reading on your gauge, refers to the difference in pressure from your intake manifold (14.7psi) to your combustion chamber as the piston draws down the chamber and the intake valve opens.
Absolute Pressure is a scale in which 0 is complete lack of pressure (ie outer space). Engineers mainly use this scale for accuracy purposes.
Gauge Pressure is the most common usage of the term pressure. 0 refers to whatever atmospheric pressure is at the time and place of where ever you are measuring (roughly 14.7 at sea level).
The 15 inhg (inches of Mecury) you are reading on your gauge, refers to the difference in pressure from your intake manifold (14.7psi) to your combustion chamber as the piston draws down the chamber and the intake valve opens.
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