Dorch Stage 1.5 HPFP Upgrade – BMW N55

OVERVIEW

The DS15 is Dorch's Stage 1.5 high pressure fuel pump for the N55, replacing the widely successful Dorch Stage 1 (DS1) with a pump redesigned and optimized from the ground up.

Externally the packaging has been updated to improve hose routing and make installation easier. Internally Dorch reworked the pressure chamber, spring rates and plunger depth and optimized the pump's volumetric efficiency, producing a 250 bar capable unit. This complete plug-and-play kit supports up to 550 whp on E10, although that figure varies with tuning strategy and ethanol blend.

There is no cutting, no bending and no crimping; the kit drops straight in with full control from the DME, and all of the stock DME's safety strategies remain in place. Dorch backs the kit with a lifetime warranty and in-house calibration support.

SPECS

• Operating pressure: 250 bar
• Flow capacity, gasoline: 550 whp (700 whp with the +38% N55 Lift Kit, 750 whp with the +49% N55 Lift Kit)
• Flow capacity, E85: 400 whp (560 whp with the +38% N55 Lift Kit, 610 whp with the +49% N55 Lift Kit)
• 100% plug-and-play OEM fitment — no cutting, bending or crimping
• Includes a 250 bar capacity hardline to connect the HPFP to the fuel rail
• Dorch lifetime warranty
• Not compatible with 2011–2012 N55 vehicles

PARTS INCLUDED

• Dorch lifetime warranty
• HPFP with hardware
• High pressure line
• 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 MHD (MHD Super License – N55 F-Series / MHD Super License – N55 E-Series) or BOOTMOD3 (BOOTMOD3 N55 Tune), select the Dorch pump upgrade option when flashing. Otherwise send your .BIN file to tuning@dorchengineering.com for the appropriate WinOLS changes.
• Choose the correct harness version when ordering — new style for 12/2013 and later builds, old style for earlier builds. Not sure which you have? See the Dorch N55 "Which Harness Do I Need?" Guide (PDF).
• Optional: the Dorch N55 Lift Kit (+38% or +49%), required to reach the higher flow figures in SPECS — Contact Speed Logic for availability.

Installation

• Dorch N55 HPFP Kit Installation Instructions (PDF)
• Dorch N55 "Which Harness Do I Need?" Guide (PDF)

Notes

• Starred Dorch fitments (F10, F25/F26, E8x, E9x, E84, E70/E71) apply to 2013 and later cars fitted with the original Bosch HPFP only. This kit is not compatible with 2011–2012 N55 vehicles.

PART NUMBER

• DE-55-15A — new style harness (12/2013 and later)
• DE-55-15B — old style harness (pre-12/2013)

VEHICLE APPLICATIONS