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Mechanical boost/vac gauge?

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Old 07-04-2008, 02:24 PM
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Car: 1989 Camaro Iroc Z28
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Mechanical boost/vac gauge?

Where do you hook it up so that you can read both vacuum and boost? Right now I have it hooked at the outlet of my supercharger, reading only boost.
Old 07-04-2008, 03:28 PM
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Re: Mechanical boost/vac gauge?

Anywhere below the throttle blades.
Old 07-04-2008, 04:45 PM
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Car: 1989 Camaro Iroc Z28
Engine: L98
Transmission: 700R4
Axle/Gears: Borg Warner 9-Bolt/ 2.77
Re: Mechanical boost/vac gauge?

I've tried it about 6in in front of the blades and still no vacuum. With the supercharger on, I think it will not show any vacuum.
Old 07-04-2008, 04:48 PM
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Car: 1984 Z28 Hardtop
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Re: Mechanical boost/vac gauge?

"Below" is "behind", not "in front of. You need to measure the pressure in the manifold, which means having the throttle between the gauge and the supercharger.
Old 07-04-2008, 05:15 PM
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Car: 1989 Camaro Iroc Z28
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Re: Mechanical boost/vac gauge?

Alright, I 'll have to try again later. I'll post if it still doesn't work.
Originally Posted by Apeiron
"Below" is "behind", not "in front of. You need to measure the pressure in the manifold, which means having the throttle between the gauge and the supercharger.
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