Dorch N55 Stage 1 HPFP Upgrade

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This is a complete plug-and-play kit to support up to 550whp (this number can vary quite a bit depending on tuning strategy and the blend of ethanol). There’s no cutting, no bending, no crimping, etc. This kit drops right in with full control from the DME, just like the OEM pump. All of the safety and sophistication of the stock DME remain in place.

 

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

Software changes are required to run this pump. If using MHD or Bootmod3, simply check the box for our pump upgrade when flashing.. Otherwise, please send your .BIN file to [email protected] for the appropriate software changes. This change is free of charge for all of our customers.

Kit Contents:

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

Kit Fitment:

F87 – M2

F20/21 – 135i, 135xi
F22/23 – 235i, 235xi
F30/31/34 – 335i, 335xi
F32/33/36 – 435i, 435xi
F10/11 – 535i, 535xi *
F25/26 –  X3/X4 35i *
F15/16 – X5/X6 35i

E8X – 135i *
E9X – 335i *
E84 – X1 35i *
E70/71 – X5/X6 35i *

*ONLY 2013+ models with OE Bosch HPFP
KIT NOT COMPATIBLE with 2011-2012 N55 Vehicles

 

Installation Instructions:

N55_HPFP_Kit_Installation