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Thread: MAP sensor questions

  1. #1
    Potential Tuner
    Join Date
    Feb 2006
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    Alaska
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    MAP sensor questions

    I have a 2015 2500HD Silverado 4x4 that I just installed a LSA supercharger on. I am using the LSA 3Bar sensor(12592525) that came with the blower. I have been doing a lot of reading as I'm trying to get it to run properly. I read that I need to change the VVE table axis, when I click on it there are options for .10-1.00 x0.02, .10-2.00 x0.03, or .10-3.00 x0.04 and the Label is MAP/BARO (Pressure Ratio). When I look at an LSA file it has different options and the label is Manifold Absolute Pressure (kPa). Does that correspond straight across or are they totally different animals? And how do I setup the scanner to read it?
    Any help would be appreciated.
    87 IROC, 2015 2500HD Silverado, 69 Camaro, 58 GMC w/2002 2500 running gear, 60 Corvette

  2. #2
    Potential Tuner
    Join Date
    Feb 2006
    Location
    Alaska
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    Thanks anyway I figured it out.
    87 IROC, 2015 2500HD Silverado, 69 Camaro, 58 GMC w/2002 2500 running gear, 60 Corvette

  3. #3
    Potential Tuner
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    Oct 2014
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    9
    Why not share what you did for the next guy?

  4. #4
    Senior Tuner mowton's Avatar
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    Mar 2007
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    Florida
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    MAP represents the absolute pressure (vacuum/boost) in the manifold, PRatio is just the ratio between the MAP and Barometric Pressure. So if you ambient Baro is say 95 kPa and the MAP is 40 Kpa then the PRatio os 40/95 or a PRatio of .42 (vacuum). If you are in the boost and MAP reads 145 kpa, then 145/95 equates to a 1.53 PRatio. Just two different ways to represent load axis relating to the VVE tables.

    Ed M
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