Boost guage test
12-15-2009, 07:01 PM
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Boost guage test
Did a test on our factory boost guage. I had a pretty nice spare boost guage and i wanted to see how far off our factory mounted guage was off since i had heard from various people that it was off. I T'd off the factory vacume line from the intake manifold and ran the line through the driver window. I noticed right after i started it that our factory guage read 20vac and the other read about 18vac. When taking off at about 10vac on the factory guage the other read about 9 or 8vacume. At 0psi both were very close almost dead even. My alternate guage only went to 20psi but when i made a pull in 2nd gear it read what would have been about 25psi and held around 22-23ish psi. The factory guage read 23psi and held 21psi.
12-15-2009, 07:54 PM
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not really. I have heard people on here talking about it being off so i wanted to see for my self.
not really. I have heard people on here talking about it being off so i wanted to see for my self.
not really. I have heard people on here talking about it being off so i wanted to see for my self.
Last edited by silverbullet08; 12-15-2009 at 07:54 PM. Reason: Automerged Doublepost
12-15-2009, 09:48 PM
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It is off by 2-3 psi or about 10%. If you are exceeding 25 psi it will be even further off. 10% is off by quite a bit IMO.
12-17-2009, 12:22 PM
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