Dorch Engineering N55 Stage 2 HPFP

Uprated high-pressure fuel solution for BMW N55 turbo engines

Chasing reliable power on your N55? This premium direct-injection pump upgrade delivers the fuel volume serious builds demand. Ideal for big-turbo or hybrid setups, it supports around 650 wheel horsepower on petrol and enables full E85 capability up to roughly 500 whp depending on calibration, hardware and fuel quality. It is a genuine drop-in upgrade with OEM-like drivability and control.

We run this upgrade on our own cars and have installed it for many customers. Feedback is consistently strong: stock-like cold starts, smooth part-throttle manners and the fuelling headroom needed for aggressive boost targets and ethanol blends.

Why enthusiasts choose this pump

• True plug-in fitment with no cutting, bending or crimping
• Direct ECU control via the factory DME, retaining all safety strategies
• Massive increase in direct-injection flow for high power and ethanol use
• Perfect for road, track and fast-road builds needing dependable fuelling

Reference flow data

Approximate maximum fuel volume per camshaft revolution on the N55 cam lobe:

• HDP5 stock N55: 0.837 cc per rev
• HDP5 Evo stock B58: 0.897 cc per rev
• HDP6 stock B58TU: 1.107 cc per rev
• Dorch Stage 1: 1.221 cc per rev
• Dorch Stage 2: 1.465 cc per rev

Real-world capacity varies with calibration strategy, fuel type and hardware.

What’s in the box

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

Tuning and software

Software changes are required when fitting this pump.

• Using MHD or bootmod3: tick the pump upgrade option when flashing
• Otherwise: email your .BIN to tuning@dorchengineering.com for the required changes, free for pump customers

Vehicle compatibility

Suits a wide range of BMW models equipped with the N55 engine:

• 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 35i, X4 35i *
• F15 F16 X5 35i, X6 35i
• E8X 135i *
• E9X 335i *
• E84 X1 35i *
• E70 E71 X5 35i, X6 35i *

* Only for 2013 and newer models fitted with the OE Bosch high-pressure pump.

Not compatible with 2011–2012 N55 vehicles.

Ideal search terms and use cases

BMW N55 fuel pump upgrade, uprated DI pump, high-pressure fuel pump for M2 235i 335i 435i 535i, F-series N55 fueling solution, ethanol safe E85 E50 builds, big turbo N55 fuelling, plug and play HP fuel pump, N55 direct injection upgrade for track and road.

Professional installation

Want it fitted by specialists? MJ Modifications in Warwickshire can install, set up and coordinate your tuning. Email info@mjmodifications.co.uk for a quote.