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. turbobandit

    turbobandit Bobtail Member

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    Good move. IF, and this is a big IF, a 515hp program with a 171702 with a 115 housing was going coast to coast, it would have less back pressure than the K31 and egt will be less. But, if you are local/Regional, the K31 is perfect for a 12.7 up to 515hp, but no more. The K31 is at its limit with 515hp.
    The 115 housing on the 171702 is good to ~550hp.

    That’s why the 145 sucks so bad on a mostly stock 12.7.
     
    Swine hauler and benjamin260_6 Thank this.
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  3. harold6091

    harold6091 Light Load Member

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    the 171702 is not a bad turbo at all. it all depends in the setup and how much you are willing to spend. i actually have my 171702 up for sale if anyone is interested.
     
  4. benjamin260_6

    benjamin260_6 Medium Load Member

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    A K31 isn't even close to its limits at 515hp.
     
  5. turbobandit

    turbobandit Bobtail Member

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    Is that your opinion or fact? The K31 on a 12.7 with a 575 program will gain ~100*f for every ~100rpm past 1700rpm. There is a reason for that little thing.
     
  6. benjamin260_6

    benjamin260_6 Medium Load Member

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    I'm looking at the dyno results for a K31 on a BK 12.7 right now so I'd say fact. 600hp@1800rpm and the EGTs are only 950 and the drive pressure is just starting to pass the boost pressure. At 515hp its nowhere near it's limits.
     
    bluebob Thanks this.
  7. turbobandit

    turbobandit Bobtail Member

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    That’s my point. 950* on a dyno pull that lasts 45 seconds is fine. That number will rise on a long pull, and more rpm will certainly raise temps even more.

    I am surprised that drive pressure is anywhere near equal to boost, but I defer to your testing. Mine is only watching egt’s vs rpm.
     
  8. turbobandit

    turbobandit Bobtail Member

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  9. turbobandit

    turbobandit Bobtail Member

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    If it is possible, and not proprietary, posting the dyno chart would be most helpful...
     
  10. Brettj3876

    Brettj3876 Road Train Member

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    950 on a sustained pull won't hurt anything. That's still in the safe zone.
     
  11. Brettj3876

    Brettj3876 Road Train Member

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    More rpm=more airflow=less egt
     
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