Dorch Stage 2 HPFP Upgrade BMW 135i/335i/X1 N55
 
 
Our Stage 2 kit is a bigger, better version of our Stage 1 kit for some of the more extreme applications. This is a complete plug-and-play kit to support 650whp and also allow for full E85 up to 500whp (these numbers can vary quite a bit depending on tuning strategy, fuel type, etc.). 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 tuning@dorchengineering.com 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
 
BMW 1-SERIE E81/E82/E87/E88 135I
BMW 1-SERIE E81/E82/E87/E88 1M COUPE
BMW 3-SERIE E90/E91/E92/E93 335I
BMW 1-Serie F20/F21 135i
BMW 2-Serie F22/F23 235i
BMW 2-Serie F22/F23 M2
BMW 3-Serie E90/E91/E92/E93 335I
BMW 3-Serie F30/F31/F34 335i
BMW 4-Serie F32/F33/F36 435i
BMW X4 F26 M40i
BMW X5 F15 50i
BMW X6 F16 50i