How can I increase power to my Detroit 11.1L S60 (350 HP rated) Series engine

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ivesti, May 29, 2021.

  1. p608

    p608 Road Train Member

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    600 hp and 1600 ftlbs of torque is nothing to make a video about.
     
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  3. jamespmack

    jamespmack Road Train Member

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    Serious Sixty is what you need to Google with location I provided. He 100% can make a 11.1 run. I would try it before spending all the money these guys are proposing.
     
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  4. little cat 500

    little cat 500 Road Train Member

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    Can get over 500 out of 11.1 with program and turbo
     
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  5. Brandt

    Brandt Road Train Member

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    They can do more with newer Detroit S60. They can do 1,000HP with 6NZ cat engine. The limit is more on how much money someone wants to spend
     
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  6. jamespmack

    jamespmack Road Train Member

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    No a DDec2 is a prom. Programmable read only memory. Its a chip like early gm cars and trucks. Your early GMs with the computer controlled quadrajet is DDC software. You actually can interface with a laptop and adjust and control the carb. Except no one had laptops back then. If you wanna spend the money, you can do neat stuff with them. But now it's still old tech.

    DDec3/4 is Programmable.
     
  7. MLC Adventures

    MLC Adventures Medium Load Member

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    Yes, you are correct. Post DDEC 2 would be DDEC 3 and 4. Plug and play options are available for those. DDEC 2 can be tuned but ECM would have to be sent in.
     
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  8. ivesti

    ivesti Bobtail Member

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    @jamespmack - I found the guys, will definitely give them a call, thank you.
    The engine again is year 1997 11.1L and the ECM is actually a DDEC 4 from a 12.7, it's just rated at 350 HP.
     
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  9. ivesti

    ivesti Bobtail Member

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    The cylinder stroke for the 11.1 is 5.47 in (139 mm), while for 12.7 is 6.30 in (160 mm).
    That would mean that I would also have to change the crankshaft to a 12.7 one?
    The cylinder bore is the same on both engines: 5.12 in (130 mm).
     
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  10. Dino soar

    Dino soar Road Train Member

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    I don't know anything about the series 60 or the difference from 12.7 to 11.1, but if the larger engine has a longer stroke doesn't that mean that the block itself is different?

    If you put a different crankshaft in and you have a longer stroke what will keep the Pistons from hitting the valves?
     
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  11. jamespmack

    jamespmack Road Train Member

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    He will get you safely more power. Your not gonna get 500. His work is proven. You will be happy.
     
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