X15 Performance- Working good?

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

  1. nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    39k miles 900 hrs no issues I love the power 565 hp 1850tq 19spd 342 ratios fully max 80k on flatbed from Norfolk ne to.chicago il 6.2 mpg all day @ 71 mph
     
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  3. nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    And it's a 389 pete
     
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  4. Hegemeister

    Hegemeister Road Train Member

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    Jun 16, 2012
    Mechanicsburg, PA
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    Nice. hoping to get that with my new W9. Getting prepped right now.
     
  5. nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    Sometimes I get 6.5 but I downshift before the truck needs it when going up a hill just to be the 1st on top lol or i step on it a little bit bring up to 75mph so I wont overall need to downshift on the hil truck is very strong with a 48k steel coil I feel like the truck is asking for more weight i drive my 18spd transmission like a 13 depends if I start on a up hill from 0 heavy loaded I'll use the splitter on the low gears, with the weight we're all hauling 80k or less I dont think we need a 18spd imo but it's fun to have it
     
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  6. BAR5M

    BAR5M Light Load Member

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    May 20, 2014
    Wyoming
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    Alright men, today my X15 is in the shop. Stop engine light, torque derate and 6 active codes for low fuel rail pressure. Shop says its probably a pump or injector. Just barely turned 20k miles. Been running/pulling great up until now. Good part is they say they have the parts in stock though it may be Monday before they can get to it. We just loaded a scraper this morning in IL headed for UT. #### it. X15 performance, 605/2050 in a 2019 wide hood. I'll keep you posted.
     
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  7. nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    Check your fuel filter they say they're good for 50k miles but once I get 15k to 20k miles on them my fuel gage turns the light red and the Hg pressure goes up to 15 to 18 as soon as I change it it's all good I do my service every 18k to 20k miles with synthetic blend and I change fuel filter with it so.im good on timing I have 53k miles on it thank God knocking on wood nothing happens been great so far
     
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  8. nunofreddy

    nunofreddy Light Load Member

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    Jun 3, 2014
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    Did you finally pick up your w9? How you liking it?
     
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  9. RollinThunderVet

    RollinThunderVet Heavy Load Member

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    Mar 19, 2014
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    THIS RIGHT HERE... I just hit 75k.
    Been running 25k intervals on PMs.
    Around 12-15k the paper fuel filter is clogged and MPGs drop...
    I can also attest to the 1600 sweet spot, especially if loaded. 78k this past week.
    @1450/70mph I was around 4.7mpg
    @1600/75mph I was around 5.3mpg
     
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  10. RollinThunderVet

    RollinThunderVet Heavy Load Member

    720
    970
    Mar 19, 2014
    0
    THIS RIGHT HERE... I just hit 75k.
    Been running 25k intervals on PMs.
    Around 12-15k the paper fuel filter is clogged and MPGs drop...
    I can also attest to the 1600 sweet spot, especially if loaded. 78k this past week.
    @1450/70mph I was around 4.7mpg
    @1600/75mph I was around 5.3mpg
     
  11. Hegemeister

    Hegemeister Road Train Member

    1,912
    1,660
    Jun 16, 2012
    Mechanicsburg, PA
    0
    Yes. Love it. A little tight the first couple thousand miles, but then she loosened up and pulls really well.

    I have 5500 miles and my fuel filter guage is up to 15 pulling a grade. Ahhhhhh! Hoping it's just crap in the tanks from manufacturing and it should get better. Dont want to be doing roadside filter changes in between PMs.
     
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