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RPM stays at 1700 cruising@ 65

Discussion in 'Experienced Truckers' Advice' started by Harman514, Nov 28, 2019.

Page 1 of 6
  1. Nov 28, 2019 #1
    Harman514

    Harman514 Bobtail Member

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    Nov 28, 2019
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    I have cascadia Cummins isx 500
    Rpm stays at 1700 cruise @65
    Tire size 11r 22.5
    Is there i can do to lower the rpms ?
     
    Harman514, Nov 28, 2019
    Harman514, Nov 28, 2019
    #1
    Bakerman Thanks this.
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  3. Nov 28, 2019 #2
    jammer910Z

    jammer910Z Road Train Member

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    New rear ends.
     
    jammer910Z, Nov 28, 2019
    jammer910Z, Nov 28, 2019
    #2
    Lepton1 and Bean Jr. Thank this.
  4. Nov 28, 2019 #3
    jammer910Z

    jammer910Z Road Train Member

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    That's what... 390s ?
     
    jammer910Z, Nov 28, 2019
    jammer910Z, Nov 28, 2019
    #3
  5. Nov 28, 2019 #4
    misterG

    misterG Road Train Member

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    shift again.
     
    misterG, Nov 28, 2019
    misterG, Nov 28, 2019
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    magoo68, PE_T, AModelCat and 8 others Thank this.
  7. Nov 28, 2019 #5
    MACK E-6

    MACK E-6 Moderator Staff Member

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    That might be what I would try first. :biggrin_25523:
     
    MACK E-6, Nov 28, 2019
    MACK E-6, Nov 28, 2019
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    Cattleman84, LoneRanger, PE_T and 7 others Thank this.
  8. Nov 28, 2019 #6
    jammer910Z

    jammer910Z Road Train Member

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    Yeah.. there might be a couple more gears they haven't discovered yet.

    OP.. what tranny is in it ?
    If it's an 18, you gotta flip and lift.
    You'll find some more.
     
    jammer910Z, Nov 28, 2019
    jammer910Z, Nov 28, 2019
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    Cattleman84, LoneRanger, PE_T and 3 others Thank this.
  9. Nov 28, 2019 #7
    misterG

    misterG Road Train Member

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    To be somewhat fair. Our straight trucks do run high rpm's at speed.
    But they're all 6 speed transmissions.

    My little S\A Cascadia with a dd13, and 10 spd Eaton only get 1450 rpm at 65 mph.
     
    misterG, Nov 28, 2019
    misterG, Nov 28, 2019
    #7
    PE_T, D.Tibbitt and FlaSwampRat Thank this.
  10. Nov 28, 2019 #8
    MACK E-6

    MACK E-6 Moderator Staff Member

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    ...And smaller engines too, I’m sure. They usually tach quite a bit higher.

    My Pete lugs along at 1100 running 65. I won’t run 12th gear on anything but interstate. Anywhere with a 55 mph posted I lock it in 11th.

    Of course, on our newest trucks now you’re limited to 53 mph in 11th gear. :rolleyes:
     
    MACK E-6, Nov 28, 2019
    MACK E-6, Nov 28, 2019
    #8
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  11. Nov 28, 2019 #9
    misterG

    misterG Road Train Member

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    Yup, smallest engines the Boss can find. For our straight turcks.
    We have a S\A Columbia geared like your Pete in a 10 spd. We never use 10th anywhere, but on the interstate.
    Other wise it lugs and belches black smoke.
     
    misterG, Nov 28, 2019
    misterG, Nov 28, 2019
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    D.Tibbitt Thanks this.
  12. Nov 28, 2019 #10
    Bakerman

    Bakerman Road Train Member

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    Slow it down you speed demon!
     
    Bakerman, Nov 28, 2019
    Bakerman, Nov 28, 2019
    #10
    whoopNride, FlaSwampRat and D.Tibbitt Thank this.
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