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Thread: 2005 MAP Sensor Rescaling

  1. #21
    Senior Tuner Jim P's Avatar
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    Try this...
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  2. #22
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    Thank you. I will give it a try a little later today and let you know how it works.

  3. #23
    Senior Tuner Jim P's Avatar
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    Well?

  4. #24
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    Sorry, just flashed it in got hung up on a job yesterday. It is reading 12.2 psi. Very close now. What do you think

  5. #25
    Senior Tuner Jim P's Avatar
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    One thing question is the 4.8v stated as the upper end scale. I think it should be 4.5v, but I dunno. It?s set to the scaling that can be found on diesel parts websites that sell them.

    How far off is it from your Baro sensor reading at engine off? Just an FYI, Cummins ECM?s do funny things with the MAP sensor reading at key on and startup at times. Mine will at times read lower than baro at key on and get worse after engine start but if I turn the key to on, wait a few, key off and wait a few then key back on it will match baro reading and hold matching baro reading at idle after start.

  6. #26
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    Is there a PID for baro in HP tuners? I did not see it in there.

  7. #27
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    Found it under sae. Key on engine off Baro is 13.6 and Boost Psi is 12.

  8. #28
    Senior Tuner Jim P's Avatar
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    Try putting the voltage axis back to stock and see if it brings it in closer.

  9. #29
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    Did it and it is reading 12.3 psi. made a very small difference.

  10. #30
    Senior Tuner Jim P's Avatar
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    Try raising the pressure axis by 10.6%. Might be a bit much, not sure.