Boost Gauge issues
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Elder User
Joined: Oct 2007
Posts: 672
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From: NJ
Boost Gauge issues
I am installing my new gauge set, and when I was attaching the hose for the boost gauge, the hose tore at the ferrule. So, I got a new ferrule, but now when I blow down the tube, or even in the fitting on the gauge, the needle won't move. It would move before ht original hose snapped. Any ideas why it won't move?
Thanks,
Jack
Thanks,
Jack
Elder User
Joined: Mar 2003
Posts: 699
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From: northern Michigan
Remember that your boost gauge is PSIG and it takes a lot of lung to produce a few PSIG. To test the gauge use compressed air through a regulator and see howmany psi it takes to move it by comparing the reading on another gage. May be a bad gauge or it may be you ain't windy enough.
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Elder User
Joined: Oct 2007
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From: NJ
I think I somehow managed a few PSI blowing with my mouth, I am a trumpet player and a distance runner, so I guess I have a pretty good diaphragm. I don't have an air compressor 
, so I guess if I can't find a piece of hose lodged in there, I will just hook it up. What do you mean by PSIG?
, so I guess if I can't find a piece of hose lodged in there, I will just hook it up. What do you mean by PSIG?
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Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
PSIG is PSI Gauge as compared to PSIA, which is PSI Ambient. Your boost gauge will read Zero PSIG no matter what the PSIA is. PSIA is ambient air pressure. At sea level it is 14.7 PSI. At 5,000 ft it is approx. 12.5 PSI.
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Post Fiend
Joined: Jul 2005
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Yes Kris I got it wrong. Actually the A in PSIA stands for Absolute. PSIA is pounds-force per square inch absolute which is the gauge pressure plus local atmospheric pressure. If the gauge reads 15 PSI and the atmospheric pressure is 14 PSI then the PSIA=29.
Postmaster
Joined: Oct 2005
Posts: 2,956
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From: Northeast TN
I don't know about taking the face off. I just bought a couple of fittings from Lowe's, so I can hook my boost gauge to my air compressor. You could do this and see if it works, just make sure you have a regulator.
