Dorch Engineering BMW N55 Stage 1 and Stage 2 High Pressure Fuel Pump HPFP Upgrade
The ultimate BMW N55 HPFP upgrade for reliable power, seamless drivability and proven results. The Dorch Engineering Stage 1 and Stage 2 high pressure fuel pump kits are true plug-and-play direct injection fuel pump upgrades for N55 engines, engineered to maintain full OEM DME control and safety while unlocking the fuelling headroom your tune needs. Ideal for tuned BMW M2, 135i, M135i, M235i, 335i, 435i, 535i and xDrive variants, these pumps deliver stable rail pressure, strong mid-range torque and clean top-end power on petrol and ethanol blends.
We run these Dorch HPFPs on customer N55 builds and the feedback has been excellent. Fit-and-forget reliability, easy calibration via MHD or Bootmod3 and impressive gains once the stock pump becomes the bottleneck.
Why choose this BMW N55 HPFP upgrade
- Genuine Dorch Engineering plug-and-play HPFP with OEM-like integration
- Supports higher power safely with maintained DME safeguards
- No cutting, no bending, no crimping and no permanent modifications
- Compatible with MHD and Bootmod3 pump options for simple software setup
- Backed by Dorch Engineering Lifetime Warranty
Stage options
Stage 1 – DE-55-1001
- Complete plug-and-play HPFP kit
- Supports up to 550 whp depending on tune and ethanol blend
- Full DME control retained for OEM safety and drivability
Stage 2 – DE-55-2001
- Higher output HPFP for more demanding applications
- Supports up to 650 whp, and full E85 up to ~500 whp depending on tune and fuel
- Complete plug-and-play kit with OEM-level control via the DME
Fuel flow reference
Approximate fuel flow per camshaft revolution on the N55 cam lobe:
- HDP5 stock N55: 0.837 cc/rev
- HDP5 Evo stock B58: 0.897 cc/rev
- HDP6 stock B58TU: 1.107 cc/rev
- Dorch Stage 1: 1.221 cc/rev
- Dorch Stage 2: 1.465 cc/rev
Actual supported power varies with calibration strategy, fuel quality and ethanol content.
Software and tuning
Software changes are required to run this HPFP. If using MHD or Bootmod3, simply select the Dorch pump upgrade option when flashing. Otherwise, send your BIN file to tuning@dorchengineering.com for the correct changes. This service is free of charge for Dorch customers.
What’s included
- High Pressure Fuel Pump with mounting hardware
- High pressure line
- Low pressure line
- Low pressure line bracket
- Plug-and-play adapter harness
Compatibility – BMW N55 models
- F87 – M2
- F20/F21 – M135i, M135ix
- F22/F23 – M235i, M235ix
- F30/F31/F34 – 335i, 335ix
- F32/F33/F36 – 435i, 435ix
- F10/F11 – 535i, 535ix
- F25/F26 – X3/X4 35ix *
- F15/F16 – X5/X6 35i and 35ix
- E82/E88 – 135i *
- E90/E91/E92/E93 – 335i and 335xi *
- E84 – X1 35ix *
- E70/E71 – X5/X6 35i and 35ix *
* Only 2013 and newer vehicles with OE Bosch HPFP.
Please note: Not compatible with 2011–2012 N55 vehicles.
Harness adapters: Type A for cars manufactured before 2014, Type B for cars after 2014. If your build date is late 2013 to early 2014, contact us and we will confirm the correct harness before you order.
Not sure if your N55 is covered? Email sales@nforcd.com and we will check fitment for you.
Compatibility check before dispatch
To ensure the part fits your vehicle, we run a free compatibility check prior to dispatch. Provide your UK registration or the last 7 of your VIN at checkout and we will verify before shipping.
Professional fitting
For installation, we recommend professional fitting at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com and our team will be happy to help.
Part numbers
- Stage 1: DE-55-1001
- Stage 2: DE-55-2001
Manufacturer and warranty
Manufactured by Dorch Engineering.
Dorch Engineering Lifetime Warranty.
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