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X15 Performance- Working good?

Discussion in 'Kenworth Forum' started by BAR5M, Jan 11, 2018.

Page 13 of 14
  1. May 20, 2019 #121
    Oso

    Oso Light Load Member

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    Aug 6, 2010
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    ISX's were fine around 1350. Granted, you had to shift a little more often.
     
    Oso, May 20, 2019
    Oso, May 20, 2019
    #121
    Dave_in_AZ Thanks this.
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  3. Jun 8, 2019 #123
    victorsam

    victorsam Bobtail Member

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    Jun 8, 2019
    0
    2019 565/2050 41k miles, 3.25 rears.

    Milage is fairly consistent at 5.8 to 5.9 running 65 to 70k gross. It is a bit better when I am not running the hills and and against the winds of Wyoming.

    Had what seemed to be an engine vibration when pulling hard right at 1300 rpm. Dealership reset the overhead and that helped the vibrations substantially, but not completely. Apparently there was a TSB from Cummins on this.

    Other than the vibration, I have not had any issues. I do agree with others here that there is no way this engine likes to be down at 11500 rpms. Mine likes to live 1450 to 1550.
     
    victorsam, Jun 8, 2019
    victorsam, Jun 8, 2019
    #123
    Dave_in_AZ and Hegemeister Thank this.
  4. Jun 8, 2019 #123
    Oso

    Oso Light Load Member

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    Aug 6, 2010
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    How fast are you going and what kind of truck? (I'm guessing a classic.)
     
    Oso, Jun 8, 2019
    Oso, Jun 8, 2019
    #123
  5. Jan 30, 2020 #124
    Carolina kidd

    Carolina kidd Bobtail Member

    1
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    Jan 25, 2020
    0
    Ive got a 2019 389 x15 565hp 1850tq 3.36rear wit 140,200 no issues at all. I pull reefer truck was set at 70mph an it got 5.5 to 5.8mpg grossing 76 to 78000. Now we open her wide open an took all parameters out an WOWW shes awake now doin the same loads i now get 6 to 6.4mpg. An now she pulls hills like a BEAST
     
    Carolina kidd, Jan 30, 2020
    Carolina kidd, Jan 30, 2020
    #124
    alds and Hegemeister Thank this.
  7. Jan 31, 2020 #125
    Hegemeister

    Hegemeister Road Train Member

    1,912
    1,660
    Jun 16, 2012
    Mechanicsburg, PA
    0
    What parameters?
     
    Hegemeister, Jan 31, 2020
    Hegemeister, Jan 31, 2020
    #125
  8. Feb 10, 2020 #126
    BAR5M

    BAR5M Light Load Member

    53
    52
    May 20, 2014
    Wyoming
    0
    Hey guys figured I'd give an update. 141,804 on the clock now. Just had the TSB done for the little EGR/exhaust piece that's been troublesome. Other than that and the fuel filters that need changed OFTEN it's been pretty reliable. I cant say what mileage is because I don't check it.. typically not getting all that great pulling these loads anyway. I can run all day on the fuel I pack (270 gals) weighing 140-150k. The engine does vibrate a lot at low idle. I dont idle hardly at all and when I do its elevated and seems to be quite a bit smoother. To date the emissions system has operated flawlessly- probably just jinxed it but that's the way it goes. Not engine related but at about 80k had to have the front driver rebuilt. Input shaft lash was too tight and it started to eat itself. Warranty took care of it. Good luck everyone.
     

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    BAR5M, Feb 10, 2020
    BAR5M, Feb 10, 2020
    #126
    seagreg and Dave_in_AZ Thank this.
  9. Feb 10, 2020 #127
    Hegemeister

    Hegemeister Road Train Member

    1,912
    1,660
    Jun 16, 2012
    Mechanicsburg, PA
    0
    Ask for a primary fuel filter with a larger micron. I believe it's about 30 microns. I've been using those filter for over a year now and they last the 20k miles for a PM. the original filters only lasted 6k.
    Also, ask them to set the ecm idle to 650 rpms, idles much smoother. 600 is rough.
     
    Hegemeister, Feb 10, 2020
    Hegemeister, Feb 10, 2020
    #127
    Dave_in_AZ and BAR5M Thank this.
  10. Feb 15, 2020 #128
    nunofreddy

    nunofreddy Light Load Member

    157
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    Jun 3, 2014
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    Where did you take it to get the parameters fixed I have 2019 389 565hp 1850tq 342rears 18spd she pulls great. In flatbed I was averaging 5.8 to 6.3 now I'm doing reefer and its low like around 5 to 5.2 on heavy loads but I was thinking also my mpg was down cause of the weather different fuel blend but if you're getting 6 to 6.4 on reefer that's great cause of the wind drag of the trailer
     
    nunofreddy, Feb 15, 2020
    nunofreddy, Feb 15, 2020
    #128
    Hegemeister Thanks this.
  11. Feb 15, 2020 #129
    nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    Also I don't lug my engine lowest I let it get is 1400rpm when i down shift l, usually at 1450 or 1500rpm i downshift in a hill/ mountain upshift at 1650 to 1700 rpm
     
    nunofreddy, Feb 15, 2020
    nunofreddy, Feb 15, 2020
    #129
    Dave_in_AZ Thanks this.
  12. Feb 15, 2020 #130
    nunofreddy

    nunofreddy Light Load Member

    157
    64
    Jun 3, 2014
    0

    I idle at 850rpm engine sounds smoothly then I wouldn't idle so low with this dpf system I sometimes idle at 950 but that's usually when it's really cold just to keep the exhaust filters good
     
    nunofreddy, Feb 15, 2020
    nunofreddy, Feb 15, 2020
    #130
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