My boost guage is in mmhg and i want to know what it is in vac?
Rotary Freak
Joined: Mar 2004
Posts: 1,994
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From: USA
Originally Posted by TwinTurbo_SE7EN
^^
psi is for pressure. vacuum is measured in inHG (inches of mercury). how are you measuring 9 psi of vacuum? it is not possible.
If you see ~ 9 on your boost gauge, that is inHG...not psi. the boost reading is in psi and the vacuum reading is in inHG.
psi is for pressure. vacuum is measured in inHG (inches of mercury). how are you measuring 9 psi of vacuum? it is not possible.
If you see ~ 9 on your boost gauge, that is inHG...not psi. the boost reading is in psi and the vacuum reading is in inHG.
I just never noticed that before.
"Some gauges are "retarted" and do display vac in psi. My profec e-01 for example, if I want to see boost in PSI then it displays vac in psi is well."
wtf.... did you even read my post??!!
wtf.... did you even read my post??!!
Junior Member
Joined: Feb 2004
Posts: 23
Likes: 0
From: UK
PSI, inHg and mmHg are all measures of pressure. It just so happens that by convention that some "mecurial" gauges are set up to read absolute pressure rather than relative pressure.
My Profec shows vacuum in PSI by indicating negative pressure - ie. it shows pressure relative to ambient.
My Profec shows vacuum in PSI by indicating negative pressure - ie. it shows pressure relative to ambient.
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