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    • Dorch Engineering Stage 1 and Stage 2 BMW N55 HPFP upgrade kits coming

      You may recall an article last month about the Dorch Engineering Stage 1 and Stage 2 upgraded HPFP's for the BMW B58 motor. Well, they have the N55 covered as well with their Stage 1 and Stage 2 HPFP upgrade kits launching in a week.


      The Stage 2 is $500 more and obviously offers more flow:

      N55 HPFP Flow Capacities

      The table below serves as a reference for maximum fuel flow in cubic centimeters per camshaft revolution for various N55 fuel pump options. These calculations are based on the N55 cam lobe. Each engine will have varying fuel flow capacities depending on the lift and number of lobes on the camshaft.
      Pump Model Fuel Flow (cc/rev)
      HDP5 (Stock N55) 0.837
      HDP5 Evo (Stock B58) 0.897
      HDP6 (Stock B58TU) 1.107
      Dorch Engineering Stage 1 1.221
      Dorch Engineering Stage 2 1.465


      You will need software changes to take full advantage of the upgraded pumps which MHD is able to provide. You can also have your .BIN file modified by Dorch Engineering.

      Kit Contents:

      • HPFP w/ Hardware
      • High Pressure Line
      • Low Pressure Line
      • Low Pressure Line Bracket
      • Plug-n-Play Adapter Harness

      Kit Fitment:
      F87 M2
      F22 235i, 235xi
      F30 335i, 335xi
      F32 435i, 435xi
      F10 535i, 535xi

      E92 335i (ONLY 2012+ models originally equipped with Bosch HPFP)
      E82 135i (ONLY 2012+ models originally equipped with Bosch HPFP)

      This article was originally published in forum thread: Dorch Engineering Stage 1 and Stage 2 BMW N55 HPFP upgrade kits coming started by Sticky View original post
      Comments 2 Comments
      1. maxnix's Avatar
        maxnix -
        If early N55 fitment is true, then N54 fitment might work also unless the fuel pressure is too high for the piezoelectric injectors.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        If early N55 fitment is true, then N54 fitment might work also unless the fuel pressure is too high for the piezoelectric injectors.
        This won't apply to the N54.