Dorch Stage 1.5 HPFP Upgrade – BMW N55

OVERVIEW

Dorch's latest generation of pumps replaces the widely successful Dorch Stage 1 (DS1) with the DS15 — a Stage 1.5 unit redesigned and optimized from the ground up.

Externally the pump packaging has been updated to improve hose routing and make installation easier. Internally Dorch reworked the pressure chamber, spring rates and plunger depth and completely optimized the volumetric efficiency of the pump, producing a 250 bar capable unit. This is a complete plug-and-play kit supporting up to 550 whp on E10 fuel, although that figure varies considerably 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, just like the OEM pump, and all of the safety and sophistication of the stock DME remains in place. Dorch backs the kit with a lifetime warranty, 24/7 customer support from working engineers and technicians, and a dedicated in-house calibration engineer who develops all HPFP files using OEM calibration tools.

SPECS

• Maximum operating pressure: 250 bar
• Flow potential on gasoline: 550 whp
• Flow potential on gasoline with the +38% N55 Lift Kit: 700 whp
• Flow potential on gasoline with the +49% N55 Lift Kit: 750 whp
• Flow potential on E85: 400 whp
• Flow potential on E85 with the +38% N55 Lift Kit: 560 whp
• Flow potential on E85 with the +49% N55 Lift Kit: 610 whp
• Supports up to 550 whp on E10 fuel, varying with tuning strategy and ethanol blend
• Quoted gains over the previous DS1 pump are measured at 200 bar
• 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 or BOOTMOD3 N55, 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.
• Optional: the Dorch N55 Lift Kit (+38% or +49%), required to reach the higher flow figures quoted in SPECS.
• Note the correct harness style must be selected when ordering — new style for 12/2013 and later cars, old style for pre-12/2013 cars.

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

• Rows marked “2013+ with OE Bosch HPFP” fit 2013 and later cars fitted with the original Bosch high pressure fuel pump only. This kit is not compatible with 2011–2012 N55 vehicles. Confirm your exact model year and harness style with Speed Logic before ordering.

PART NUMBER

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

VEHICLE APPLICATIONS