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Thread: Looking for scan points

  1. #1
    Senior Member
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    Sep 2007
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    Default Looking for scan points

    Working on a 2001 Silverado.

    I looked the scan points over for the program but I'm not finding what I am looking for. I may just be missing them. What I'm looking for are scan points to:

    1. Measure RPM rise per second, tagging the affected fuel and spark points on their respective maps. If there is such a scan point it could be used like a psuedo-dyno, to get the max WOT power. What I'd like to see (if it's there) is a meter that, if the truck increased from 2000RPM to 2200RPM in one second, it registers 200RPM at that point. Be better if it logged every 10th of a second though, or the parameters were definable.

    2. Measure fuel use per second, tagging the affected fuel and spark points on their respective maps. If there is such a scan point it could be used to get the maximum fuel economy while cruising.

    Are there scan points like this, and if not could they be added in? All the data should be there already so it would just be a matter of making a meter to measure them. Thanks.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    27,414

    Default

    You can define/add calc pids to an already saved log.

    1.

    there is a dx() function that is available for calc pid usage;
    it calculates the numerical derivative/slope wrt time (i.e. rate of change) of the pid you specify;
    e.g. dx({SAE.VSS.mph},6) calculates the rate of change of VSS over the last 6 data frames;
    it is described in the scantool user manual pdf.


    2.
    look at the pid GM.INJFLOW.gps

    I have a MPG calc pid: "{SAE.VSS.mph}/{GM.INJFLOW.lbpm}/{CALC.INJDC1}*100/60/8*6.073"

    see attached calc_pids.txt file (rename it to calc_pids.txt and place in folder User Configuration, or otherwise merge into existing calc_pids.txt file there).
    Attached Files Attached Files
    Last edited by joecar; September 25th, 2018 at 03:47 AM. Reason: typos

  3. #3
    Senior Member
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    Sep 2007
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    Default

    Superior! Thank you sir, as soon as I get the truck back on the road I'll be using this.

  4. #4
    New Member Judlor's Avatar
    Join Date
    Sep 2018
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    1

    Default

    Quote Originally Posted by joecar View Post
    You can define/add calc pids to an already saved log.

    1.

    there is a dx() function that is available for calc pi usage;
    it calculates the numerical derivative/slope wrt time (i.e. rate of change) of the pid you specify;
    e.g. dx({SAE.VSS.mph},6) calculates the rate of change of VSS over the last 6 data frames;
    it is described in the scantool user manual pdf.


    2.
    look at the pid GM.INJFLOW.gps

    I have a MPG calc pid: "{SAE.VSS.mph}/{GM.INJFLOW.lbpm}/{CALC.INJDC1}*100/60/8*6.073"

    see attached calc_pids.txt file (rename it to calc_pids.txt and place in folder User Configuration, or otherwise merge into existing calc_pids.txt file there).
    Thanks for this answer!

    Cheers,
    Diceus

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