08-23-2013, 02:16 PM
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#40 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Chicago
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Quote:
Originally Posted by TopgunZ
Doesn't it measure vacuum pressure and forced pressure in the manifold?
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Yes but it measure relative to the atmosphere pressure. Atmospheric pressure is zero on a boost/vacuum gauge, at any altitude. So you have to run 2.6psi more boost on the gauge to get the same air pressure in your manifold as the same exact car at sea level. So if you drove down to sea level. And ran the same boost gauge pressure, you will get 2.6psi more manifold pressure than you did in Denver, and make more power (and lean out if you're in a car without MAF sensors or absolute MAP reference, or if you don't have enough fuel for the extra HP)
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