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DD15 HP w/ 2.85 rears

Discussion in 'Ask An Owner Operator' started by traderpats, Apr 4, 2017.

  1. Apr 4, 2017 #1
    traderpats

    traderpats Light Load Member

    101
    99
    May 24, 2013
    Oregon
    0
    I posted on the Garage section but not much feedback. Anyways question for those in the know. Looking at a new Freightliner Cascadia. Spec'd with the DT12 OD transmission, 2.85 rears and 505HP. My question is since I rarely haul above 30k or so I don't need the truck turned up to 505HP. I asked the salesperson about turning it down to 400 - 455 or so as a fuel saving measure and he said it "wasn't advised" although I couldn't get him to elaborate on that.

    I was under the impression that raising / lowering the HP settings was a fairly straightforward adjustment with the shop computer. With this combo is there anything else I need to be considering? Thanks in advance.
     
    traderpats, Apr 4, 2017
    traderpats, Apr 4, 2017
    #1
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  3. Apr 4, 2017 #2
    Sharky88

    Sharky88 Heavy Load Member

    715
    851
    Sep 25, 2013
    0
    I wouldn't change a thing. With your transmission and rear ends in order to run properly you need to have the proper torque and horse power. I have a 500 hp with 2.64 rears 2050 ft/lbs torque. It dose the job but wouldn't want any less hp.
     
    Sharky88, Apr 4, 2017
    Sharky88, Apr 4, 2017
    #2
    Dave_in_AZ and bzinger Thank this.
  4. Apr 4, 2017 #3
    FRANK_WOT

    FRANK_WOT Bobtail Member

    28
    14
    May 8, 2016
    Cape Town, South Africa
    0
    I bet it doesn't feel like you've got 2050 uphill with those rears?.. but you can probably do 85mph on flats without much fuzz.
     
    FRANK_WOT, Apr 4, 2017
    FRANK_WOT, Apr 4, 2017
    #3
  5. Apr 4, 2017 #4
    Sharky88

    Sharky88 Heavy Load Member

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    Sep 25, 2013
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    Your right I still do around 45 mph up the mountains in California fully loaded turn 1150 at 60 mph get an average of 7.8 mpg
     
    Sharky88, Apr 4, 2017
    Sharky88, Apr 4, 2017
    #4
    Dave_in_AZ Thanks this.
  7. Apr 4, 2017 #5
    Sharky88

    Sharky88 Heavy Load Member

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    851
    Sep 25, 2013
    0
    Btw it's a D16 not the 13.
     
    Sharky88, Apr 4, 2017
    Sharky88, Apr 4, 2017
    #5
  8. Apr 4, 2017 #6
    FRANK_WOT

    FRANK_WOT Bobtail Member

    28
    14
    May 8, 2016
    Cape Town, South Africa
    0
    7.8 sounds very nice. Manual or auto? You said D16 so I guess Volvo i-shift?
     
    FRANK_WOT, Apr 4, 2017
    FRANK_WOT, Apr 4, 2017
    #6
  9. Apr 4, 2017 #7
    Sharky88

    Sharky88 Heavy Load Member

    715
    851
    Sep 25, 2013
    0
    Yeah I shift. I'm happy with it. The truck was spec'ed for heavy haul not sure why with a 2.64 rear but I only haul 80k gross. Probably get better milage with a D13
     
    Sharky88, Apr 4, 2017
    Sharky88, Apr 4, 2017
    #7
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