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  1. J

    M915 low power. Looking for likely problems.

    Cummins Northwest told me that boost is an accurate way to judge horsepower. On the ntc400 you get all 400 hp when you have 25 psi. 17 psi means about 300 hp. Thanks for the replies. Jim
  2. J

    M915 low power. Looking for likely problems.

    Y'all... I have a M915 with the NTC400 engine. Don't know if it's a BC1 or BC3. Seems weak. Only develops 17 PSI of boost, and the manual says it should develop about 25 if running right. Have looked through the postings and see things about hot-rodding them for more power, but not seeing a...
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