Dorch Stage 2.5 HPFP Upgrade – BMW B58 Gen1

OVERVIEW

The DS25 is Dorch's Stage 2.5 high pressure fuel pump for the Gen1 B58 — the replacement for the widely successful Dorch Stage 2 (DS2), redesigned and optimized from the ground up.

The kit follows OEM hose routing, so there is no interference when servicing coil packs or spark plugs. There is no cutting, no bending and no crimping; the pump drops straight in with full control from the DME, just like factory. Internally Dorch reworked the pressure chamber, spring rates and plunger depth and optimized the pump's volumetric efficiency, and the DS25 runs efficiently all the way to 250 bar to make the most of upgraded direct injection injectors.

Dorch backs the kit with a lifetime warranty, around-the-clock support from working engineers and technicians, and an in-house calibration engineer who develops its HPFP files using OEM calibration tools.

SPECS

• Operating pressure: 250 bar
• Flow capacity, gasoline: 750 whp (1000 whp with the Dorch +40% cam upgrade)
• Flow capacity, E50: 650 whp (880 whp with the Dorch +40% cam upgrade)
• Flow capacity, E85: 550 whp (770 whp with the Dorch +40% cam upgrade)
• Plug-and-play OEM fitment — no cutting, bending or crimping
• 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 Gen2 B58 vehicles

PARTS INCLUDED

• Dorch lifetime warranty
• HPFP with hardware
• Dorch high pressure line (250 bar hardline)
• Engine cover spacer
• Plug-and-play adapter harness

TECH RESOURCES

Additional Parts Required

• Software changes are required to run this pump. With BOOTMOD3 (BOOTMOD3 B58 Tune), MHD (MHD Super License – B58) or MG Flasher, select the Dorch pump upgrade option when flashing. Otherwise send your .BIN file to tuning@dorchengineering.com for the appropriate WinOLS changes.
• ECU unlock is required before a locked B58 DME can be flashed — see our ECU Unlock Service for BMW B58 Engines.
• Recommended: higher-flowing direct injection injectors to use the pump's full flow potential.
• Optional: the Dorch +40% exhaust camshaft (fuel cam) upgrade, required to reach the higher flow figures in SPECS — Contact Speed Logic for availability.

Installation

• Dorch B58 Gen1 HPFP Kit Installation Instructions (PDF)

Notes

• G-chassis applications (5, 6, 7 Series and X3/X4) are covered up to the 2019 model year only. Confirm your model year and engine generation with Speed Logic before ordering.

PART NUMBER

• DE-581-25E — B58 Gen1 DS25 HPFP Upgrade

VEHICLE APPLICATIONS