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R32 Standard Boost Gauge, Whats 100xmmhg?

r32matt

By r32matt,
in Engines & Forced Induction

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r32matt

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Posted

Hi,

I was just wondering if anyone knows how the standard boost gauge reads on a R32? Is it in PSI, or is mmhg something different. I read somewhere that mmhg is equal to 13psi. Im not sure if this is right, can someone please help?

Thanks

Matt

Quinny Rising Star

Quinny

Posted
Posted (edited)

It is an abbreviation for "millimetre/Mercury", and the x100 bit is the numbers on the guage need to the multiplied by 100 to get the correct reading (kind of like a tacho being x1000 rpm) - so 7 on your guage would represent 700mm/Hg.

The conversion rate is:

1mm/Hg = 0.0193psi (so 1000mm/hg = 19.3psi)

1psi = 51.715mm/Hg (so 10psi = 517.15mm/Hg)

1bar = 14.5psi or 750mm/Hg.

In your example, 13psi = 672.3mm/Hg (or 6.723 on your guage)

I think you will find that the guage is accurate, you just need to know how to read it.

Hope that clears things up.

Edited by Quinny
Quinny Rising Star

Quinny

Posted
Posted
mm mine was showing 14 psi of boost (after translation from mmhg) whereas my aftermarket gauge was showing only 10.2 psi. I have heard of innacurate readings for it before but mainly on 32's, so..

Not sure about 32s, but the 33 seems to be pretty good. At full throttle, my factory guage reads just above the 350 mark, which is about right because 7psi equates to 362mm/Hg.

Below 4000rpm, where the low-boost is in place, the guage reads about 3/4 between 0 and 350, which would be about right or 5psi (or 258mm/hg)

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