BOOST/VACUUM CONVERSIONS [Mpa, bar, atm, psi, inHg)
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This is a discussion on BOOST/VACUUM CONVERSIONS [Mpa, bar, atm, psi, inHg) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; This question seems to come up a lot, so I figured I would put it in it's own thread. Manifold ...

  1. #1
    Registered User PlatinumWRX's Avatar
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    Boost and vaccum pressure conversions (Mpa, bar, atm, psi, inHg, hkPa)

    This question seems to come up a lot, so I figured I would put it in it's own thread.

    Manifold Air Pressure (or boost/vacuum) can be measure in a variety of units, these include MPa, bar, atm, psi, and inHg (inches of mercury). If I left anything out, let me know, but I think I covered all of the usual suspects.

    0.1 MPa = 1.0 bar = .987 atmospheres = 14.5 psi = 29.53 inHg

    These are the real unit conversions from .1 MPa to all the others with minimal rounding.

    1 atm = 14.7 psi for further reference.

    When the boost gauge reads 14.7 psi, that mean that you have twice the nominal atmospheric pressure available to your intake valves. When the gauge reads 0 you are at atmospheric pressure. When the gauge reads negative, you engine is drawing a vacuum on the intake manifold, just like a naturally aspirated car always does.

    I hope this clears up any confusion for our members that are new to the world of turbocharging.

    -Jim

    p.s. A Pascal (Pa) is the metric unit for pressure equal to 1 Newton of force distributed across 1 square meter of area (N/m^2). A MegaPascal (MPa) is 1 million Pascals or 1,000,000 Newtons / 1 meter^2.
    Last edited by KurleeDaddeeWRX; 09-03-2002 at 09:49 PM.
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  3. #2
    Registered User masanz1's Avatar
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    MPa to psi conversion

    MPa/0.00689476=PSI

    i.e

    .1 / 0.00689476 = 14.5PSI
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  4. #3
    Registered User NJSubieTech's Avatar
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    A great sight that will do pretty much any unit conversions you need - to as much accuracy as you need them:

    http://srd.yahoo.com/goo/scientific+...sion+tables/1/*http://www.convert-me.com/en/

    Speed safely,

    Joe
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  5. #4
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    Here is a converter I mentioned in another post. It will convert about anything.

    ftp://ftp.wsdot.wa.gov/public/Metrics/convert.exe

    Sorry for the double post, not sure how to link back to the other.

    Bill
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  6. #5
    Moderator TypeC's Avatar
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    another good link for any type of conversion

    http://www.digitaldutch.com/unitconverter/
    Street Racer Emeritus
    '02 2.5L WRX - Retired
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  7. #6
    Moderating U! KurleeDaddeeWRX's Avatar
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    You forgot hkPa

    Here is also a very good conversion website. Since Bar and hkPa are the same.

    http://www.worldwidemetric.com/metcal.htm

    Kurlee Daddee
    (THE ORIGINAL)
    Last edited by KurleeDaddeeWRX; 09-03-2002 at 09:49 PM.
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