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Old 09-20-2006, 04:00 PM   #1
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Default What exactly does "in-hg" mean on a boost gauge?

I know it's vaccuum, but I'm wondering what the technical term is for it.

Thanks!
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Old 09-20-2006, 04:09 PM   #2
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Default Re: What exactly does "in-hg" mean on a boost gauge? (KooK)

inches mercury.
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Old 09-20-2006, 04:28 PM   #3
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Default Re: What exactly does "in-hg" mean on a boost gauge? (KooK)

For those who want a bit more info, 2in/hg is close to 1psi, except psi is usually for pressure and in/hg for vacuum, hence the mixed units on gauges. 28in/hg is basicly absolute vacuum, which is why high rpm decel gets close to that.
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Old 09-20-2006, 04:48 PM   #4
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Default Re: What exactly does "in-hg" mean on a boost gauge? (wade)

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Originally Posted by wade
inches mercury.
You're the second guy who has told me that now, I'm starting to get confused damnit. Why in the hell would they say inches mercury.
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Old 09-20-2006, 04:57 PM   #5
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Default Re: What exactly does "in-hg" mean on a boost gauge? (KooK)

read the other post and it explains it. unless your IQ is like 21
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Old 09-20-2006, 07:16 PM   #6
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Default Re: What exactly does "in-hg" mean on a boost gauge? (wade)

^^Hey now, you're the one from Kentucky!


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Old 09-20-2006, 07:27 PM   #7
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Default Re: What exactly does "in-hg" mean on a boost gauge? (KooK)

Quote:
Originally Posted by KooK

You're the second guy who has told me that now, I'm starting to get confused damnit. Why in the hell would they say inches mercury.
Looks like science wasn't your best subject.

Pressure can be measured in many ways. BAR, psi, and in-hg.

Inches mercury, "in-hg", is a unit of pressure equal to one inch of mercury rise in a barometer.

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Old 09-20-2006, 07:32 PM   #8
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Default Re: What exactly does "in-hg" mean on a boost gauge? (Finest)

say at idle.. when warm 800rpm's what would be a good healty value for a stock gsr boosted 'in-hg'?
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Old 09-20-2006, 07:38 PM   #9
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Default Re: What exactly does "in-hg" mean on a boost gauge? (HamiltonRex)

Quote:
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say at idle.. when warm 800rpm's what would be a good healty value for a stock gsr boosted 'in-hg'?
Mid 20's in Hg.

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