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cat ecm ppm settings

Discussion in 'Trucks [ Eighteen Wheelers ]' started by dwmac71, Aug 18, 2010.

  1. Aug 18, 2010 #1
    dwmac71

    dwmac71 Light Load Member

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    Lane,ks
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    I have a 95 5ek motor that i need to change the ppm to correct the speedometer that reads fast 2 to 3%. I went from 24.5 lp to 22.5 wide singles 501rpm to 516rpm. So do I raise the ppm 3% or lower them?

    I know this nob question, but I don't want to fry this ecm guessing.

    Thanks for any help you can give.
     
    Last edited: Aug 18, 2010
    dwmac71, Aug 18, 2010
    dwmac71, Aug 18, 2010
    #1
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  3. Aug 18, 2010 #2
    beltrans

    beltrans Medium Load Member

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    To get correct PPM you multiply 516 by your rear gear ratio and then by the number of teeth of your speed sensor gear.
     
    beltrans, Aug 18, 2010
    beltrans, Aug 18, 2010
    #2
  4. Aug 18, 2010 #3
    dwmac71

    dwmac71 Light Load Member

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    Thanks, any ideal how to tell number of teeth on the sensor? The truck is a 95 white/gmc/volvo.
     
    dwmac71, Aug 18, 2010
    dwmac71, Aug 18, 2010
    #3
  5. Aug 18, 2010 #4
    beltrans

    beltrans Medium Load Member

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    spokane wa
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    Quickest way is to call your dealer service.
     
    beltrans, Aug 18, 2010
    beltrans, Aug 18, 2010
    #4
    dwmac71 Thanks this.
  7. Aug 18, 2010 #5
    e500gvr

    e500gvr Light Load Member

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    Bloomington,MN
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    If memory serves me the average ( or standard) number is 16 for the chopper wheel teeth
     
    e500gvr, Aug 18, 2010
    e500gvr, Aug 18, 2010
    #5
    dwmac71 Thanks this.
  8. Aug 19, 2010 #6
    Mr. Haney

    Mr. Haney Road Train Member

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    516 tire revolutions per mile x 16 teeth on the speed tone ring in transmission x gear ratio in rears = PPM
     
    Mr. Haney, Aug 19, 2010
    Mr. Haney, Aug 19, 2010
    #6
    dwmac71 Thanks this.
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