BMW HDP6 HPFP Upgrade (B58 Gen1/B58TU) - A90 Toyota Supra/Z4 High-Pressure Fuel Pump for M140i M240i 340i 440i - OEM Direct Injection Pump, Ethanol/E85 Ready, ~23% Flow Gain - N55 Retrofit Option

OEM HDP6 High-Pressure Pump Upgrade for BMW B58 Gen 1

Unlock reliable fueling headroom for serious power with the genuine BMW HDP6 high-pressure petrol pump. This is the sought-after “Supra/Z4” direct-injection pump upgrade for early B58 platforms, delivering the flow you need for bigger turbos, aggressive remaps and ethanol blends while retaining factory drivability and OEM reliability.

Ideal for enthusiasts chasing strong gains on M140i, M240i, 340i and 440i models, this uprated DI pump is the proven solution for stable rail pressure under load. We run this unit on our own builds and countless customer cars, and the results have been superb: smooth fueling, excellent cold starts and headroom for serious bhp targets when calibrated correctly.

Why this upgrade

• Substantial flow increase over the standard HDP5 Evo unit, enabling stronger top-end fueling on tuned setups.
• Supports around 600 bhp on regular petrol with appropriate supporting mods and a proper map.
• Optimised for ethanol mixes (E blends) with the right calibration, helping you extract more torque safely.
• OEM+ solution using a genuine BMW high-pressure pump for durability and consistency.
• Perfect complement to Stage 2 and Stage 2+ software, hybrid turbos and advanced intake/exhaust upgrades.

Flow comparison

• HDP5 Evo (stock B58): 0.954 cc/rev
• HDP6 (B58TU/Supra/Z4): 1.178 cc/rev

That is approximately a 23 percent increase in displacement per revolution for stronger fuel delivery at higher load and rpm.

Fitment and compatibility

Direct upgrade for BMW models with the first-generation B58 engine. A small wiring extension is required on Gen 1 cars.

• 1 Series F20 M140i
• 2 Series F22 F23 M240i
• 3 Series F30 F31 F34 340i
• 4 Series F32 F33 F36 440i

Retrofit is also possible to selected N55-powered cars (F20 M135i, F22/F23 M235i, F30 335i, F32/F33/F36 435i, F87 M2) with modification to the pump housing. This is a popular fuel system upgrade for those platforms when chasing higher power on pump fuel or ethanol blends.

Installation and tuning

• Bolt-on replacement for B58 Gen 1 with a loom extension.
• Calibration is required to take full advantage of the increased capacity.
• Best results when combined with appropriate intake, exhaust and turbo upgrades.

Want it fitted professionally? Book your installation with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and tuning guidance.

Who is this for

If you are planning a remap, running higher boost, exploring E blends or aiming for reliable 500–600 bhp capability on a B58 platform, this genuine HDP6 high-pressure fuel pump delivers the fueling stability your build needs. It is a proven, OEM-quality path to more power without compromising drivability.

Key search terms

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