Dorch Stage 1.5 HPFP Upgrade Kit – 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 The widely successful Dorch Stage 1 (DS1) has been replaced by the DS15 — a Stage 1.5 pump redesigned and optimized from the ground up.

Externally the pump packaging has been updated for improved hose routing. There is no cutting, no bending and no crimping; the kit drops straight in with full control from the DME, exactly like the factory pump. Internally Dorch reworked the pressure chamber, spring rates and plunger depth and completely optimized the volumetric efficiency of the pump, producing a unit rated to 250 bar.

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: 600 whp
• Flow potential on gasoline with the Dorch +40% cam upgrade: 750 whp
• Flow potential on E85: 440 whp
• Flow potential on E85 with the Dorch +40% cam upgrade: 610 whp
• Quoted gains over the previous DS1 pump are measured at 200 bar
• 100% 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
• Dorch lifetime warranty
• Not compatible with Gen 2 B58 vehicles

PARTS INCLUDED

• Dorch lifetime warranty
• HPFP with hardware
• High pressure line
• Quick connect low pressure line
• Low pressure line 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 changes.
• ECU unlock is required before a locked B58 DME can be flashed — see our ECU Unlock Service for BMW B58 Engines.
• 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-581-15A — 1–4 Series fitment
• DE-581-15B — 5–7 Series fitment
• DE-581-15C — X3 / X4 fitment

VEHICLE APPLICATIONS