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550 cat fuel economy?s

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 2hellandback, Mar 30, 2009.

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  1. Mar 30, 2009 #1
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    What kind of fuel economy can i see on a 1999 W900L 550 hp CAT 3:70 rears at 1400 rpm/ 65mph? And where may the sweet spot be (RPMs)?

    I should add pulling a full load.
     
    Last edited: Mar 30, 2009
    2hellandback, Mar 30, 2009
    2hellandback, Mar 30, 2009
    #1
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  3. Mar 30, 2009 #2
    24valve puller

    24valve puller Medium Load Member

    399
    89
    Sep 8, 2007
    N.E. Oh
    0
    what kind of trailer?
     
    24valve puller, Mar 30, 2009
    24valve puller, Mar 30, 2009
    #2
  4. Mar 30, 2009 #3
    dirtyoldman

    dirtyoldman Light Load Member

    264
    70
    Dec 30, 2007
    None of your business
    0
    i run a peterbilt with a 550cat same gearing, I get 5mpg if i run loaded at 65 but I am a car hauler, so not aerodynamic and always 80+k

    Not much help I am sure.


    BTW if you want fuel economy, dont buy a w900. You neet a T700 volvo or freightliner.

    Stacks, air filters, windshield visors, and flat front surface area kill mileage.
     
    dirtyoldman, Mar 30, 2009
    dirtyoldman, Mar 30, 2009
    #3
  5. Mar 30, 2009 #4
    JSmitty

    JSmitty Light Load Member

    288
    52
    Feb 22, 2009
    Midland Tx
    0
    I'd venture to say 4-5
     
    JSmitty, Mar 30, 2009
    JSmitty, Mar 30, 2009
    #4
  7. Mar 30, 2009 #5
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    LOL it will be an alloy tanker, 7-7500 gal
     
    2hellandback, Mar 30, 2009
    2hellandback, Mar 30, 2009
    #5
  8. Mar 30, 2009 #6
    HISPEED428

    HISPEED428 Light Load Member

    157
    21
    Mar 28, 2009
    Plum Coulee,MB
    0
    My 02 550 averaged between 5.5-6mpg pulling a reefer.When I sold it # 923000 miles ecm average was 5.6mpg lifetime.I had 3.70 rears and an 18 DO.70mph @1500rpm is what it seemed to like best.24.5 tall rubber
     
    Last edited: Mar 30, 2009
    HISPEED428, Mar 30, 2009
    HISPEED428, Mar 30, 2009
    #6
  9. Mar 30, 2009 #7
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    My ? then would i be better of going 3:55 or 3:36 and a cummins 475 or 550 hp and i like 900L or 379 petes(I think they may ride better) looks but i can live with T-600 just cant live with the volvo look.

    OH forgot to mention buying used and im sticking to pre egr.
     
    2hellandback, Mar 30, 2009
    2hellandback, Mar 30, 2009
    #7
  10. Mar 30, 2009 #8
    HISPEED428

    HISPEED428 Light Load Member

    157
    21
    Mar 28, 2009
    Plum Coulee,MB
    0
    Engine wise it's personal preference.I won't buy anything but CAT.Rear ratio would depend on on what size tire you plan to run.My personal experience with the older Cat's is 1500rpms # whatever speed u plan to cruise at.
    I can figure it out but I need to know your transmission ratio in the big hole and your tire size.
     
    Last edited: Mar 30, 2009
    HISPEED428, Mar 30, 2009
    HISPEED428, Mar 30, 2009
    #8
  11. Mar 30, 2009 #9
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    13 spd or 18 spd,,, and possibly but not likely a 15 spd .

    I would like to keep best fuel economy i can get at 65-70 mph so im thinking 3:70s then with 24.5 hi or LPs . its just stuck in my head most economy is at 1300 -1400 rpms.

    Preference for 900Ls /379s But i have to consider what's going to make the money also, thus T-600s.

    Weight will always be at max or over. ALSO i get paid by the ton so truck weight is a factor also.
     
    Last edited: Mar 30, 2009
    2hellandback, Mar 30, 2009
    2hellandback, Mar 30, 2009
    #9
  12. Mar 30, 2009 #10
    HISPEED428

    HISPEED428 Light Load Member

    157
    21
    Mar 28, 2009
    Plum Coulee,MB
    0
    1325 rpm at 65 mph is for the Acert Cats according to Caterpillar if GCW is 80000lbs or less.1500-1650 at cruise speed if GCW is 90000lbs or more .3406E Cats like to run about 1450-1550rpms.When I switched to a company that had a 65mph speed limit my mpg's went down.I changed from 24.5 tall to 24.5 lo-pro and changed the revs per mile in the ecm to 500 to bring my rpms's back up.

    If I were you I would be lookin for an 02 flattop Pete with a 6NZ Cat.If mine would have been a flattop I would still be drivin it.
     
    HISPEED428, Mar 30, 2009
    HISPEED428, Mar 30, 2009
    #10
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