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Cat c15 bxs overhaul or 6nz swap???

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Ruben01, Feb 1, 2022.

  1. Feb 1, 2022 #1
    Ruben01

    Ruben01 Bobtail Member

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    Feb 1, 2022
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    Hey guys have a question to all them cat experts so I currently have a 2005 kenworth t800 with a cat c15 bxs prefix engine the engine has blow by so Im going to have to overhaul it or swap it to a junkyard 6nz im looking for more power and better fuel mileage and better throttle response i dont feel that the bxs runs like them 6nz
    Should I overhaul the bxs do the single turbo swap and tune or swap 6nz and tune???
    Thanks for any advise
     
    Ruben01, Feb 1, 2022
    Ruben01, Feb 1, 2022
    #1
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  3. Feb 1, 2022 #2
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Get the BXS properly tuned. A single turbo will never outperform the twins.
     
    AModelCat, Feb 1, 2022
    AModelCat, Feb 1, 2022
    #2
    Lalito.1234 and A5¢ Thank this.
  4. Feb 1, 2022 #3
    Ruben01

    Ruben01 Bobtail Member

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    Feb 1, 2022
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    Do you know of any good tuners??? That can help me with that thanks
     
    Ruben01, Feb 1, 2022
    Ruben01, Feb 1, 2022
    #3
  5. Feb 1, 2022 #4
    lester

    lester Midwest's #1 Feed Hauler

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    Rebuild the bxs as a 6nz. Acert is a great start to a good reliable engine.
    16:1 compression pistons and remove IVAS.
    Keep the twins I think.

    Bxs is 70 pin I believe. Lots of good tunes for them. Facebook cat engine masters has good info. Or Kurt Murray is a great tuner and very knowledgeable. Little spendy but worth it. Pm me and I could get you his contact information
     
    lester, Feb 1, 2022
    lester, Feb 1, 2022
    #4
  7. Feb 2, 2022 #5
    little cat 500

    little cat 500 Road Train Member

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    BXS is as good if not better than a 6NZ with a good tune
     
    little cat 500, Feb 2, 2022
    little cat 500, Feb 2, 2022
    #5
    lester Thanks this.
  8. Feb 2, 2022 #6
    rogermunn1

    rogermunn1 Light Load Member

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    Dec 17, 2017
    NewBrunswick
    0
    Ill take my MXS over any 6NZ ive come across yet . Blocks are stronger . I believe the BXS and MXS are almost the same . My MXS has zero polutuion additions . Well except for a little black smoke when you really stomp on it
     
    rogermunn1, Feb 2, 2022
    rogermunn1, Feb 2, 2022
    #6
    little cat 500 Thanks this.
  9. Mar 30, 2025 #7
    Rigid05

    Rigid05 Bobtail Member

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    Mar 25, 2025
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    Could you email me Mr Haney's contact info?
     
    Rigid05, Mar 30, 2025
    Rigid05, Mar 30, 2025
    #7
  10. Mar 30, 2025 #8
    Cdemars316

    Cdemars316 Heavy Load Member

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    Nov 10, 2018
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    If you go to cat tuning on Facebook, there are lots of guys there that specialize in tuning, I would personally be really careful about letting anyone put a tune in my truck. But along with everyone else, I would rebuild the bxs remove IVA's and put a good non lo nox cat tune in it
     
    Cdemars316, Mar 30, 2025
    Cdemars316, Mar 30, 2025
    #8
    Oxbow and little cat 500 Thank this.
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