X15 cummins performance series 485-605 does anyone have experience with these new engine?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HX520-X15, Dec 16, 2017.

  1. HX520-X15

    HX520-X15 Bobtail Member

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    Dec 16, 2017
    Charleston SC
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    Im looking to buy a new international HX520 dump truck with a X15 485 performance series engine and and allison 4700 ofs trans.
    These engines are about a year old now and would like some input of them if they are reliable motors or not?
    Thanks!
     
    Oxbow Thanks this.
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  3. The_Gambler

    The_Gambler Bobtail Member

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    Aug 11, 2015
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    I've got 45,000 on mine in a 18 W900. No problems yet. 6.8 MPG, 3.36 rears, 18 speed. Running 70-75 MPH.
     
    Hegemeister Thanks this.
  4. Rolling18

    Rolling18 Light Load Member

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    Dec 11, 2008
    Portland, OR
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    Intrested in this as well as I am buying a new T880 w/ x15 @ 525 / 1860 bolted to Allison 4500 RDS+
     
  5. HX520-X15

    HX520-X15 Bobtail Member

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    Dec 16, 2017
    Charleston SC
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    Ive had my truck for about 2 weeks now... You'll love the stopping power of the engine brake of the x15 bolted to the rds4500! I barely have to use my brakes. The engine brake cuts of around 17mph so you have to stop it from there.
    I have the 485 performance engine and it takes off great and has plenty of power until I hit a bridge around here in sc. Then I'm not to happy with the power. I wish I would've stepped up the power some. But I'm not sure if that would my fuel mileage any or not. I guess you would just have to keep your foot out of it.
    I'm averaging about 4.9 mpg right now and using about a 1 - 1.5 gallons of def fluid per 100 miles. I sure hope this gets better with time. I'm about 3100 miles now
     
    Rolling18 Thanks this.
  6. Rolling18

    Rolling18 Light Load Member

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    Dec 11, 2008
    Portland, OR
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    Great info there on what to expect!!
    not super optomistic about your fuel milage, BUT i think diesels take like 30 - 50 k miles just to fully break in. fuel milage "should" increase for while...
    for refrence, im getting about 6.2 Mpg on my 07' acert C-13 380 HP 535K W/ allison 4500 (no def)

    still looking foreward to the new rig but NOT the DEF/ SCR crap!! id expect about the same milage with the newer tech and extra HP and all disk brakes!

    How did you configure your Tranny??
    I ordered with the "fuel sence 2.0 MAX" thats subposed to help a bit....
    Info: FuelSense
     
  7. HX520-X15

    HX520-X15 Bobtail Member

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    Dec 16, 2017
    Charleston SC
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    Yes in not either on the fuel but I guess when I'm cruisin with the cruise control on on a level road empty the truck estimates 7-8 mpg and loaded it estimates 6-7 but 95 % of my driving is around town. I never have more then a 10 mile stretch of open road to put the cruise on without stop and go traffic.
    I wasnt given and info on any fuel max 2.0 on the trans. I didn't really ask either.
    I have 4.30 rear gears and a demo body. Truck weights in just over 29k full of fuel or just under low on fuel.
     
  8. Rolling18

    Rolling18 Light Load Member

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    Dec 11, 2008
    Portland, OR
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    hmm ok well click on this link... for "Fuelsense" info. I'll probably never get to even try the cruise hehe.. i weigh 27K empty (fueled) BTW i found computer estimates VERY optomistic on all vehicles..
     
  9. Cookie931

    Cookie931 Light Load Member

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    Nov 3, 2017
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    How’s that x15 treating you on break in? I’ve just got one getting around 6mpg running 65-70 weighing 77-78k def is at about 180 per gallon 2200 on the odo
     
  10. Rolling18

    Rolling18 Light Load Member

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    Dec 11, 2008
    Portland, OR
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    UPDATE! I meant 2021 T-880 X15 565 @ 1850 w/ Allison.
     
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