X15 Efficiency vs Performance

Discussion in 'Trucks [ Eighteen Wheelers ]' started by rjs, Jan 12, 2019.

Which X15 overall?

  1. Performance

  2. Efficiency

Results are only viewable after voting.
  1. Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Hopefully oil dilution will be less of an issue as regen times have increased to around 100 hrs or more run time. Without a doubt units that get DPF neglect will end up with frequent regens and overfull crankcases as the engines get some age to them. A big change to keep in mind for sure.
     
    Oxbow and mhyn Thank this.
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  3. Edge540

    Edge540 Bobtail Member

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    Sep 12, 2019
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  4. Stewie 389

    Stewie 389 Bobtail Member

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    Nov 19, 2019
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    I have a E and run it at 1300 on avg. on the flats, and will drag it to 1100 on pulls, it pulls good there and the torque curve is strong in that rpm area
     
  5. harlycharly55

    harlycharly55 Medium Load Member

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    May 5, 2014
    Houston, TX
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    I have the performance, it's made a odd noise since day one, sounds like a bad plug in a gas engine, at lower rpms, higher rpms it goes away. 235,000 miles now and it's still there. Pretty much just ignore it, after reading about some issues I'm now wondering if it is a bad head gasket? I did have a coolant leak when new at the heater hose clamps, fixed that, but still have to add coolant occasionally, my company says it's leaking out the weep hole on the APU water pump, which you can see it is, so hopefully that is all, no coolant in the oil. But I am curious about it, I was thinking of buying the truck from my company, now I don't know. It's in a 2018 579 , 18spd, pulling tankers.
     
  6. Cheech

    Cheech Bobtail Member

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    Oct 15, 2020
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    2020 ISX1 efficiency series , whens this thing come to life or does it, doesn't seem to be able to hold a speed on the pedal or cruise , starting to miss the paccar, only have 8300 miles so far,
     
    Last edited: Feb 2, 2021
  7. OhNoTerry

    OhNoTerry Light Load Member

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    May 22, 2021
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    Hey! I'm currently looking at the same set up but with 336 rears. What speeds are you running at? Where do you usually rest your revs for max fuel efficiency? I'm gonna be pulling reefer from the PNW down to TX.
     
  8. ravisidhu05

    ravisidhu05 Bobtail Member

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    May 30, 2021
    WINDSOR
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    Your truck will do 65@1380 70@1450
     
    OhNoTerry Thanks this.
  9. bonder45

    bonder45 Road Train Member

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    Oct 2, 2011
    Williston, ND
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    18’ T880 with 500 / 1850 efficiency engine with a “removal of stuff”
    3.90 rears + 18 speed

    450,000 miles so far

    Average 5MPG pulling 80-100k

    Just got 2 new trucks and time will tell which is better.
    One has 565 / 1850 performance
    Two has 605 / 2050 performance
     
  10. ravisidhu05

    ravisidhu05 Bobtail Member

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    What ratio on 565 and 605
     
  11. ravisidhu05

    ravisidhu05 Bobtail Member

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    Your efficiency is ex or productivity series
     
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