What rpm at 65mph ???

Discussion in 'Questions From New Drivers' started by The Wiz, Jun 4, 2020.

  1. The Wiz

    The Wiz Bobtail Member

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    I have been reading many posts but still need help.
    I am looking to buy a 2016 kw t680 mx13 500hp, 18 spd manual, with 3.7 rear ratio.
    I am trying to find out what rpm it will turn at 65mph ,??
    I pull a dry van with 20-30k lbs.
     
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  3. The Wiz

    The Wiz Bobtail Member

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  4. kelgar50

    kelgar50 Medium Load Member

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    Why would you want those specs if your not running heavy haul?
    Those are horrible specs no fuel mileage there.
     
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  5. The Wiz

    The Wiz Bobtail Member

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    That's what I'm trying to figure out !!! The tractor is a great deal... I'm trying to find out if it is worth the fight.
     
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  6. 062

    062 Road Train Member

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    Roughly 1410rpm. Google road speed calculator.
     
  7. The Wiz

    The Wiz Bobtail Member

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    Thank you 062.
    Well at 1410 rpm, why would the fuel mileage be so poor ?
    Isn't this an ideal rpm ??
    And should be good on hills.
     
  8. lovesthedrive

    lovesthedrive Is here to help

    First off what engine? Detroits like 1500 rpm. Cats like 1200 rpm. Unknown for Cummins
     
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  9. 062

    062 Road Train Member

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    I never had any experience with the mx motors. @Long FLD runs one.
     
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  10. Long FLD

    Long FLD Road Train Member

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    At 65 you will be on the upper end of where you want to run the engine. The torque curve on the MX is low (1100-1400 rpm). If your plan is to consistently run 60 to 65 then it won’t be bad.
     
    Swine hauler and 062 Thank this.
  11. The Wiz

    The Wiz Bobtail Member

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    Mx13 500hp.
    I think that it is 2nd or 3rd gen.
    I currently own a 2013 Peterbilt 587 mx13 455hp, 13spd automatic, 3.42 ratio, 22.5 tires. I run 1300rpm at 65 mph but... it doesn't like hills or to much weight.
     
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