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Weaning myself off my tuner...

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    0 is no vacuum. 30 is full vacuum. Our cars should be about 18-21inHg at idle with stock cams.



      The service manual states:
      "The MAP sensor converts manifold absolute pressure into electrical signals inputs the ECM."

      If you hook up a vacuum gauge, I can see where 0 is atm and 30 is full vacuum, but that's not how the map sensor sees it according to the graph. Since it's absolute pressure, 0 should be full vacuum and 30 should be atm. If you were using Hondata or similar software, I think it displays the vacuum like a standard vacuum gauge would too.

      Now that equation makes sense.

      A gauge reading of 0 in Hg(no vacuum) is an absolute reading at atm:
      30 - 0g = 30a

      A gauge reading of 30 in Hg is an absolute reading of full vacuum:
      30 - 30g = 0a

      YouTube Clicky!!


        Just wanted to post this here incase someone else wants to learn: