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Anyone here run ISX?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 2hellandback, Mar 15, 2009.

  1. Mar 15, 2009 #1
    2hellandback

    2hellandback Heavy Load Member

    978
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    Dec 19, 2007
    Blackfoot Idaho
    0
    Anyone here run ISX 475 HPs that know what rpm that engine gets the best fuel milage.

    I know running slow will usually get you best milage but below 65 mph i get boooored to death and start falling asleep! :biggrin_25518:
     
    2hellandback, Mar 15, 2009
    2hellandback, Mar 15, 2009
    #1
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  3. Mar 15, 2009 #2
    PharmPhail

    PharmPhail Road Train Member

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    Nov 7, 2008
    NC
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    that's my engine as well. Only had it for a week. Anyway if the ondash computer can be relied upon, the fuel mileage drops off after 1350.
     
    PharmPhail, Mar 15, 2009
    PharmPhail, Mar 15, 2009
    #2
  4. Mar 15, 2009 #3
    tinglish

    tinglish Light Load Member

    163
    52
    Aug 26, 2007
    Cottonwood, CA
    0
    i think that would depend entirely on how you're geared and what tranny you have. i'm a company driver so i don't really pay much attention to the mileage, but i feel pretty lucky that most of the trucks i've driven over the last 8 years have been isx powered. it's a VERY dependable motor in my opinion.
     
    tinglish, Mar 15, 2009
    tinglish, Mar 15, 2009
    #3
  5. Mar 15, 2009 #4
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    Cool i pull 1400 at 65mph if i go tall rubber ill pull 1400 at 68mph.
     
    2hellandback, Mar 15, 2009
    2hellandback, Mar 15, 2009
    #4
  7. Mar 15, 2009 #5
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0
    3:58s and a 13 spd
     
    2hellandback, Mar 15, 2009
    2hellandback, Mar 15, 2009
    #5
  8. Mar 15, 2009 #6
    Sportster2000

    Sportster2000 Road Train Member

    1,480
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    Jan 5, 2008
    Indiana
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    The ISX has peak torque around 1300 - 1450 rpm's. After that it starts to drop off so as long as you keep it between 1300 and 1450 you should begetting some good fuel mileage.
     
    Sportster2000, Mar 15, 2009
    Sportster2000, Mar 15, 2009
    #6
  9. Mar 16, 2009 #7
    humm8823

    humm8823 Bobtail Member

    9
    1
    Mar 6, 2009
    0


    What year is your ISX
     
    humm8823, Mar 16, 2009
    humm8823, Mar 16, 2009
    #7
  10. Mar 18, 2009 #8
    2hellandback

    2hellandback Heavy Load Member

    978
    237
    Dec 19, 2007
    Blackfoot Idaho
    0

    2003 pre egr
     
    2hellandback, Mar 18, 2009
    2hellandback, Mar 18, 2009
    #8
  11. Mar 18, 2009 #9
    cat from the valley

    cat from the valley Medium Load Member

    469
    32
    Dec 8, 2008
    jamaica
    0
    we have a 06 isx in our fleet that we started running recently ,our 00 6nz c-15 gives 20 litres better mpg than the isx hauling same load wit same driver
     
    cat from the valley, Mar 18, 2009
    cat from the valley, Mar 18, 2009
    #9
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