Dorch Engineering N55 Stage 1 HPFP

Unlock reliable, repeatable fuelling for your turbocharged six-cylinder BMW. This Stage 1 high-pressure fuel pump upgrade from Dorch is a true direct replacement for the factory unit, built to deliver the extra headroom enthusiasts need while keeping OEM drivability. Expect support for up to 530 whp on E10, depending on calibration and ethanol blend, with full factory-style control via the DME for worry-free performance on road and track.

Why this uprated fuel pump

• Genuine drop-in solution; no cutting, bending or crimping
• Retains all stock ECU safety strategies and diagnostics
• Headroom for hybrids and bolt-ons aiming for 500+ whp on E10
• Smoother high-rpm fuelling and improved duty cycle margins
• Ethanol-friendly performance for blends such as E10 and beyond

Real-world results

We have installed this pump on multiple customer cars and daily drivers. Feedback has been consistently positive for start-up behaviour, idle quality and wide-open-throttle stability. It is a proven upgrade that lets your tuner keep rail pressure where it belongs under load.

Software setup

• MHD or Bootmod3 users: simply tick the fuel pump upgrade option when flashing
• All other setups: email your .BIN file to tuning@dorchengineering.com for the correct calibration changes
• Map revision is provided free of charge for Dorch customers

What’s in the box

• High-pressure fuel pump with mounting hardware
• High-pressure line
• Low-pressure line
• Low-pressure line bracket
• Plug-and-play adapter harness

Flow comparison reference

• 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

Compatibility

• F87 M2
• F20/F21 135i, 135xi
• F22/F23 235i, 235xi
• F30/F31/F34 335i, 335xi
• F32/F33/F36 435i, 435xi
• F10/F11 535i, 535xi *
• F25/F26 X3/X4 35i *
• F15/F16 X5/X6 35i
• E8X 135i *
• E9X 335i *
• E84 X1 35i *
• E70/E71 X5/X6 35i *

*Only 2013+ models with OE Bosch high-pressure pump. Not compatible with 2011–2012 N55 vehicles.

Fitting and support

Prefer professional installation and setup in the UK Our workshop at MJ Modifications in Warwickshire can supply, fit and arrange mapping support. Request a quote via info@mjmodifications.co.uk.

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