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Tune down C15 MXS 625 to 550

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mac302, Nov 14, 2024.

  1. Nov 14, 2024 #1
    Mac302

    Mac302 Bobtail Member

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    Nov 14, 2024
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    I'm looking at a Pete 379 w/ a 625 C15 MXS. Engine is 10k hours out of a platinum rebuild, has roughly 1 million miles and 38k hours on it overall. I know it's a high miler but its only use would be hauling super-b on the farm, maybe 10,000 miles a year pulling 63.5 MT or 140,000 lbs. My thought to extend the life of a high time engine like that would be to tune it down to the 550 rating. Any thoughts on this, anyone done it? Thanks.
     
    Mac302, Nov 14, 2024
    Mac302, Nov 14, 2024
    #1
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  3. Nov 15, 2024 #2
    W923

    W923 Road Train Member

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    It’s only going to make as much power as your foot asks for if it’s set for 550 or 800
    Assuming you or another responsible driver is running it id leave it be
     
    W923, Nov 15, 2024
    W923, Nov 15, 2024
    #2
  4. Nov 16, 2024 #3
    little cat 500

    little cat 500 Road Train Member

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    turn it down a guy's going to run it harder to get the job done
     
    little cat 500, Nov 16, 2024
    little cat 500, Nov 16, 2024
    #3
  5. Nov 16, 2024 #4
    bjytech

    bjytech Light Load Member

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    Nov 9, 2013
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    Nothing wrong with keeping it at 625 imo, how it does it more on the driver, maintenance, and time than anything.
    If you would want to turn if back just note that you can't just have someone put a 550 tune in it. Being a factory 625 a 550 tune will actually turn the power up close to 15% due to the hard part changes the 625 had over the factory 435-550 engines.
     
    bjytech, Nov 16, 2024
    bjytech, Nov 16, 2024
    #4
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