Boost pressure gauge

Discussion in 'SRT Hellcat General Discussions' started by ManicMechanicMD, Oct 14, 2015.

  1. ManicMechanicMD

    ManicMechanicMD Silver Member

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    I'm curious why the units on the boost gauge change. When it's a vacuum, it reads in inches of Mercury. When it's positive pressure, it's in PSI. I've had many turbo cars and the units were the same for vacuum/boost. Since this is digital, it can easily change but I'm just wondering if anyone knows why.

    Thanks in advance.
     
  2. Aarcuda

    Aarcuda Gold Member

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    vacuum is measured in inches of mercury. Pressure or boost is measured in psi
     
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  3. ManicMechanicMD

    ManicMechanicMD Silver Member

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    Interesting. Basically it's just easier that way to show on a gauge. Measurement in PSI would be possible, but you're talking PSIa/PSIg.

    This is helpful too. Thanks for the help. It's been a long time since I had physics in college.

    Basics of Vacuum
     

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in the hellcat how do i change the boost pressure gage to show psi