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Old 05-17-2010, 07:56 PM   #1
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Default low boost readout on GTP

I have a 98 gtp that I'm getting a low boost readout on my glow shift boost gauge has anyone had problems with these gauges? I'm running a 3.1 pulley on a p&p blower and the needle never moves at best a half a needles worth past the 10lb mark . I thought it was maybe belt slip so i put the shortest belt on that i could fit on and still the same any ideas?
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Old 05-17-2010, 07:59 PM   #2
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Can you get a vacuum/pressure gauge that you can connect to the vacuum line on the gauge? What reading do you have at idle? Is it around -9 or -10?
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Old 05-17-2010, 08:19 PM   #3
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As of right now I don't have a vacuum gauge handy that I can use but the glow shift one says -11ish I suppose its a possibility I have a vacuum leak perhaps but not hearing any shhhh when I shut the car off. I can see if I can borrow a gauge from somebody to confirm my readings
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Old 05-17-2010, 08:21 PM   #4
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wait I would loose vacuum if i had a leak wouldn't I? but it would drop boost if i did hmmm
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Old 05-17-2010, 08:23 PM   #5
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Almost sounds like the gauge is off. It should be around -9 or so at idle. If your at -11 at idle and +10 at WOT, I think your 2 PSI off, so +12 at WOT is close to what you should have with your set up.
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Old 05-17-2010, 08:28 PM   #6
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I'm thinking your rite because I just noticed when the car is shut off the needle doesn't sit exactly on zero its bout 2 psi off never even noticed that till now.
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Old 05-17-2010, 08:30 PM   #7
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Sounds like the face is off from the gauge.
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Old 05-17-2010, 09:20 PM   #8
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that very well could be I will look into that.
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