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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,125
The factory boost gauge in the tach measures air pressure above the throttle butterfly in the intercooler or the intermediate blow off manifold.
There is always pressure loss through the restriction of the throttle body, especially at part throttle and the boost pressure the intake manifold sees will always be less.
This is one of the reasons a mechanical boost gauge tee'd into the power brake booster hose, which is plumbed to the intake manifold is much more accurate as far as what the motor is actually seeing.
Old 01-21-2008, 08:57 PM
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