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Thread: MAP reading -18 kpa at idle, 49 kpa at atmospheric - Mystery Tune

  1. 06-30-2015 #1
    steelmesh
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    MAP reading -18 kpa at idle, 49 kpa at atmospheric - Mystery Tune

    I purchased an already modified 2006 Solstice NA with a turbo kit. Looks like it has a 2 bar MAP installed. I just noticed my MAP sensor doesn't seem right, as it's not supposed to go negative.

    Is this just some way of tricking the computer?

    I have several hours tuning HPT (learning, practicing), so that is the Foxtrot9 tune. The maptest.hpl shows atmospheric reading and then start up idling.
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  2. 07-01-2015 #2
    steelmesh
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    I am confused, my Aeroforce gage reads ~100 kpa at atmospheric pressure. HPT issue?
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  3. 07-01-2015 #3
    JimmyS
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    Quote Originally Posted by steelmesh View Post
    I am confused, my Aeroforce gage reads ~100 kpa at atmospheric pressure. HPT issue?
    It's probably an issue with the way your scanner is set up. I'm unable to look at it right now but I've seen this before with incorrect PID settings or when the incorrect sensor is being selected.
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  4. 07-02-2015 #4
    JimmyS
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    Check out post #16 here: http://www.cobaltss.net/forums/2-4l-...-using-268977/

    Maybe you need to adjust your tune for Engine Diagnostics > Airflow and change MAP Sensor Linear to 256 and Map Sensor Offset to 20 and then do the same with the SCIAP sensor.
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  5. 07-06-2015 #5
    steelmesh
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    Quote Originally Posted by JimmyS View Post
    Check out post #16 here: http://www.cobaltss.net/forums/2-4l-...-using-268977/

    Maybe you need to adjust your tune for Engine Diagnostics > Airflow and change MAP Sensor Linear to 256 and Map Sensor Offset to 20 and then do the same with the SCIAP sensor.
    The histograms show correct kpa cells covered when scanning, at least I got that going for me :P
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