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13 speed fuel milage

Discussion in 'Freightliner Forum' started by ROADDOGG63, Sep 22, 2014.

  1. Sep 22, 2014 #1
    ROADDOGG63

    ROADDOGG63 Bobtail Member

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    Sep 22, 2014
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    What would the best rear end ratio to have for fuel milage. With DD15 13speed 22.5 low pro's like to run about 62mph at 1300 rpm
     
    ROADDOGG63, Sep 22, 2014
    ROADDOGG63, Sep 22, 2014
    #1
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  3. Sep 22, 2014 #2
    bad-luck

    bad-luck Road Train Member

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    3.42 will put you around there
     
    bad-luck, Sep 22, 2014
    bad-luck, Sep 22, 2014
    #2
  4. Sep 22, 2014 #3
    Richter

    Richter Road Train Member

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    Eaton has a calculator for this.....

    http://www.eaton.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf

    We need to now the revolutions per mile of your tire t be 100% sure. Assuming your trans is a double over and not a single over you should be good with a 3.36 rear. .73 is the final drive of a 13 with double over right?

    My recommendation would be to go with a 2.64 rear. Start out in low insted of first. To cruise at 57, you can be in dirrect gear saving fuel and transmission losses. When you need to go faster you have 2 more gears available and you can fly.
     
    Richter, Sep 22, 2014
    Richter, Sep 22, 2014
    #3
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