Quote:
Originally Posted by puretone
Now the "boost" gauges are at 0.0 psi and/or 0.0 Bar even with the engine off....this is wrong because we live at a 1.0 Bar "atmosphere" at sea level no? So these dang gauges are actually off because it should all be added with one atmosphere.
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Yeah that's what I mean, the exact purpose is to measure *the difference* in pressure, not the overall pressure.
And although atmospheric pressure is *approximately* 14.7 PSI, it changes depending on altitude, whether there's a high or a low pressure system moving through, etc!
What's the difference between 14.5psi absolute atmospheric pressure, and 20.5 pounts of absolute pressure in the manifold?
6psi difference, so it is shown as 6psi on your gauge.
When the motor is off, and the absolute atmospheric pressure is 14.7psi, and the absolute pressure inside the manifold is also 14.7psi, what is the difference between the two figures?
0.00 psi, which is what the gauge reads.