12.7 Detroit need a new turbo (upgrade?), hauling light and best mpg?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Green461, Mar 24, 2020.

  1. harold6091

    harold6091 Light Load Member

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    Dec 25, 2018
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    man all i know is that i replaced the original one and put a tune in it but its a DOG with 2 legs and a cramp. i spoke to leon and he told me the only way to make it work was to put the 14l injectors and retune it.
     
    maconhadalata Thanks this.
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  3. maconhadalata

    maconhadalata Light Load Member

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    newark, nj
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    I'm rebuilding the engine right now...after its done i will get it on the road and see.
     
    Vampire Thanks this.
  4. harold6091

    harold6091 Light Load Member

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    Dec 25, 2018
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    good luck. let me know how it goes
     
    Vampire Thanks this.
  5. Green461

    Green461 Light Load Member

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    Mar 22, 2019
    Southern WI
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    Update after a year.... yearly avg was 8.6 mpg. I haul light though. 24k empty and at most 34k loaded. Im pretty happy with it probably could do a little better if i drove easier.

     
    Vampire and maconhadalata Thank this.
  6. trucker21r

    trucker21r Bobtail Member

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    Jun 19, 2019
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    Someone please pm Leon’s number and a rough estimate he charges to tune ecm.

    I haul rock in an end dump. 85.5k. All stock, 470 hp, 3.58 rears, 10 speed. All flat ground, local, 95% 65 mph highway with 5% dirt road. Its enough power but trying to maximize mpg, thought maybe 550hp would be the ticket, I rarely run above 1750 rpm. If anyone suggests (in their opinion) a better tuner, please post or pm that guy as well. Appreciate any help.
     
  7. turbobandit

    turbobandit Bobtail Member

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    Jan 19, 2018
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  8. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    finally truck is running....what can i say? ride is not harsh nor smooth, somewhere in between..as i said this truck came with a 171702 1.45 ar, full tilt manifold ,5915 injectors, ecm is ddec4 500.THIS TRUCK IS A #### DOG! just like all detroits i drove in my life. Leon's shop is close by and maybe i will try tuning it.i dont need a 800 hp engine i just want this truck to, at least, run like my cat.
     
  9. maconhadalata

    maconhadalata Light Load Member

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    maybe the best aproach would be a smaller turbo. But is not the lag that bothers me. even in high rpm this truck is too slow for my taste.
     
  10. Brettj3876

    Brettj3876 Road Train Member

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    Nov 18, 2014
    Stuck in Limbo
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    Do you have a tune? If not that's why it's dog with the 1.45 housing. Need fuel to spin that big housing. Report back when you do. Even with a tune the 1.45 might be a tad too big. The 1.32 is what you need. The 1.45 on 12.7 is over kill unless you have tons of fuel.
     
    benjamin260_6 and maconhadalata Thank this.
  11. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    Just got this truck and rebuilt the engine, 500 hp stock ddec4. 1.32 would spool faster but would cure this 'detroit lazyness"? I have a truck with a 3406e 550 and an old file (no low Nox), just need this detroit to run like that.
     
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