Thread: looking for some data on rpm v MAP...
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Old Nov 10, 2012 | 09:34 AM
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waldig
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From: VA
Talking Re: looking for some data on rpm v MAP...
Mate I dont get all that your saying here but the SC is mechanically connected to the engine and thus the inpeller speed and crank are related by the pulley ratios. The level of boost is related to the density of the charge going into the SC.

THis is controlled by you with the TB, normally the inlet ( behind the TB ) is in a vacuum; which is not a vacuum but actually a pressure below ambient. If your WOT, the boost sorta stays the same depending on inlet restrictions and engine design factors.

The ambient atmospheric pressure is typically 14.7 PSIG which is complecated by the fact that most gauges measure "Vacuum" or below ambient pressures in inches of mercury. ???
That is silly as 14.7 PSIG is about 29.92 inches of mercury, why change the terms?? I guess that it relates to the testing equipment of the old days.. Today your blood pressure is still measured in millimeters of mercury. ???

Woody
 
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