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15 speed direct drive with 2.85 rears slow up hills and poor mileage

Discussion in 'Trucks [ Eighteen Wheelers ]' started by javelinjeff, Jun 21, 2015.

Page 4 of 4
  1. Jun 28, 2015 #31
    allan5oh

    allan5oh Road Train Member

    1,557
    556
    Jan 6, 2010
    Winnipeg, mb
    0
    RTL16915?
     
    allan5oh, Jun 28, 2015
    allan5oh, Jun 28, 2015
    #31
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  3. Jun 28, 2015 #32
    allan5oh

    allan5oh Road Train Member

    1,557
    556
    Jan 6, 2010
    Winnipeg, mb
    0
    Ya no sorry.
     
    allan5oh, Jun 28, 2015
    allan5oh, Jun 28, 2015
    #32
  4. Sep 3, 2015 #33
    javelinjeff

    javelinjeff Medium Load Member

    621
    185
    Aug 30, 2007
    victorville,ca
    0
    truck went into shop that is known for making Cats run,,ECM was re-flashed to 550hp,,trim codes were way off,gained 1.8 MPG bobtail returning from shop back to house,boost is now over 32 under hard acceleration,was at about 22 before(bobtail),,if you have a pre-emissions cat with retrofit DPF or you need a DPF,,I strongly advise you to check this place out--Fletchers Diesel Repair in Lancaster California,,I've been to MANY shops trying to get this thing to run strong,this is the first place that actually made it happen,,I will post my fuel MPG's after my next load
     
    javelinjeff, Sep 3, 2015
    javelinjeff, Sep 3, 2015
    #33
    rank Thanks this.
  5. Sep 3, 2015 #34
    T800H

    T800H Medium Load Member

    608
    295
    Apr 2, 2010
    The Keys
    0
    great, glad you got it and please keep us posted.
     
    T800H, Sep 3, 2015
    T800H, Sep 3, 2015
    #34
  7. Sep 3, 2015 #35
    dirthaller

    dirthaller Road Train Member

    1,057
    12,094
    Sep 22, 2011
    Coloratah
    0
    I've never seen a direct 15 with an electronic Cat in front of it from the factory. Direct 15's died out in like 1985 electronic Cats came out around 1993. 2.85 gears are about a half a gear taller than a 3.36 (13 or 18 speed) and a whole gear above a 3.90. I'm assuming your trans is an overdrive @ either .86 to 1 or .74 to 1. In 14th gear you should be like having 3.90 rears should pull hills great!
     
    dirthaller, Sep 3, 2015
    dirthaller, Sep 3, 2015
    #35
  8. Sep 4, 2015 #36
    sparky88

    sparky88 Light Load Member

    143
    31
    Jan 22, 2014
    oswego, ny
    0
    I pull a frameless dump and had a deep reduction 15 until I snapped the shaft that holds the low gears (according to weller) pulling an 8% grade in 5th gear. Swapped in a deep reduction 18 speed and am running 3.55s in the rear with the 3406e motor in my w9. Currently if I run from Missouri loaded and back to New York empty in getting an average of 6.22 mpg. With the 15 I was getting 5.75 if I remember right. I would lose 10+ mph. Now I might lose 5 when I go up the hills
     
    sparky88, Sep 4, 2015
    sparky88, Sep 4, 2015
    #36
  9. Sep 4, 2015 #37
    rank

    rank Road Train Member

    9,918
    113,503
    Feb 11, 2010
    50 miles north of Rochester, NY
    0
    So you're probably getting ~11 empty and ~4 at 80,000.
     
    rank, Sep 4, 2015
    rank, Sep 4, 2015
    #37
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