Dorch Stage 2.5 HPFP Upgrade – BMW B58 Gen1

OVERVIEW

From the creators of the world's first B58 direct-injection fueling upgrades comes the next generation of pumps. The widely successful Dorch Stage 2 (DS2) has been replaced by the DS25 — a Stage 2.5 pump redesigned and optimized from the ground up.

Externally the packaging now follows exact OEM hose routing, so there is zero interference when changing coil packs or spark plugs. There is no cutting, no bending and no crimping; the kit drops straight in with full control from the DME, just like factory. Internally Dorch reworked the pressure chamber, spring rates and plunger depth and completely optimized the volumetric efficiency of the pump. The result is that the most reliable and highest flowing B58 pump on the market became more reliable again and flows more, and the DS25 is designed to run efficiently all the way to 250 bar in order to maximize the flow potential of upgraded direct injection injectors.

Beyond the pump itself, Dorch backs the kit with a lifetime warranty, 24/7 customer support from working engineers and technicians, and in-house calibration support — Dorch employs a dedicated calibration engineer who develops all HPFP files using OEM calibration tools and supports a global tuning network.

SPECS

• Maximum operating pressure: 250 bar
• Flow potential on gasoline: 750 whp
• Flow potential on gasoline with the Dorch +40% cam upgrade: 1000 whp
• Flow potential on E85: 550 whp
• Flow potential on E85 with the Dorch +40% cam upgrade: 770 whp
• Exact OEM hose routing — no interference with coil pack or spark plug service
• The only true plug-and-play OEM fitment option on the market, per Dorch
• Full DME control retained, as per factory
• Includes a 250 bar capacity hardline to connect the HPFP to the fuel rail, in place of bending the OEM line
• Dorch lifetime warranty
• Not compatible with Gen 2 B58 vehicles

PARTS INCLUDED

• Dorch lifetime warranty
• HPFP with hardware
• Dorch high pressure line
• PTFE low pressure line
• Low pressure hose bracket
• Plug-and-play adapter harness

TECH RESOURCES

Additional Parts Required

• Software changes are required to run this pump. With BOOTMOD3 B58, MHD or MG Flasher, simply tick the box for the Dorch pump upgrade when flashing. Otherwise send your .BIN file to tuning@dorchengineering.com for the appropriate WinOLS implementation.
• ECU unlock is required before a locked B58 DME can be flashed — see our ECU Unlock Service for BMW B58 Engines.
• Upgraded direct injection injectors are needed to make use of the pump's full 250 bar flow potential.
• Optional: the Dorch +40% cam upgrade, required to reach the higher flow figures quoted in SPECS.

Installation

• Dorch Engineering does not publish a public downloadable installation manual for this kit; instructions and support are supplied with the kit. Contact Speed Logic for installation help.

Notes

• This kit is not compatible with Gen 2 B58 vehicles. G-chassis applications are covered up to the 2019 model year only. Confirm your exact model year with Speed Logic before ordering.

PART NUMBER

• DE-581-25A — 1–4 Series fitment
• DE-581-25B — 5–7 Series fitment
• DE-581-25C — X3 / X4 fitment

VEHICLE APPLICATIONS