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  1. simp5782

    turbo on a NHC 250 Cummins?

    To wake the NHC250 up you just really need more gears. Compared to a normal 5 spd truck vs the Allison vs the Kitty Cat. Even a nice 9 spd or 13spd would give it lots of power. The allison just drags its power level down so much. Its sad actually. Ive got the aftercooler off a NTC400 someone...
  2. simp5782

    turbo on a NHC 250 Cummins?

    Yes. Play with the adjustment conservatively. That's why its best to add a rail pressure gauge to see what you are doing. Using a drill bit that is about a quarter inch to detent it. Then I go to a speed out but and drill into it and then use the extractor side to bust it loose. Much easier...
  3. simp5782

    turbo on a NHC 250 Cummins?

    I'll send you every pump I come across to drill out. It sucks
  4. simp5782

    turbo on a NHC 250 Cummins?

    You have to also drill out the flow rate adjustment ball. And add a fuel pressure gauge to adjust correctly with your air flow. You also would need a 1100cfm air filter. If in overdrive if your egts climb faster than your RPMs then you are too hot.
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