S55 Lift Kit – HPFP Upgrade

We are proud to offer an unmatched game-changing product for the S55 community! Rather than offer our standard HPFP upgrades for the S55 platform, we went back to the drawing board to come up with a higher flowing and easier to tune solution that saves you a TON of money over tradition HPFP upgrades! With this innovative solution we are able to push 38% more fuel flow out of the OEM HPFPs! We start with Genuine BMW vacuum pump cores and install our Dorch Engineering Cam within the OEM assembly using our proprietary manufacturing tooling and validation equipment. Since the S55 engine uses some of the smallest fuel pump cams in the Bosch lineup, we are able to achieve this additional flow without sacrificing any of the longevity or reliability of the OEM pumps. There’s no cutting, no bending, no crimping, etc. This kit drops right in like factory and it does not require any special tuning to get up and running. All of the safety and sophistication of the stock DME remain in place. This is not only the highest flowing, but also the ONLY HPFP upgrade available that will successfully pass emissions on OEM DME mapping; all for a fraction of the price with a lifetime warranty!

S55 HPFP Flow Capacities

Fuel Flow (cc/rev)
HDP5 (Stock S55) ███████████ 1.527 cc/rev
HDP5 w/ Dorch Lift Kit ███████████████ 2.100 cc/rev

E85 Power Capacity
HDP5 (Stock S55) ████████████ 600whp
HDP5 w/ Dorch Lift Kit ████████████████ 800+whp*

*At 800whp on E85 there is quite a bit of capacity left in our S55LK, but that’s the most that we can get out of the currently available upgraded injectors on the market.

Software changes are NOT required to run this upgrade. However, we do have preset optimized maps available via Bootmod3 and MHD. Simply check the box for our “Lift Kit” upgrade when flashing.

NOTE: The S55 fuel system is very much limited by the injectors. In order to see the true benefits of this kit, it is highly recommended to upgrade to the larger S63 EU5 Injectors. These are readily available OEM BMW injectors proven to support 700+whp on full E85.

Kit Contents:

• Dorch Lifetime Warranty
• Dorch Vacuum Pump Assembly
• Vacuum Pump Sealing Cap
• Vacuum Pump Gasket

Installation Instructions:

S55_HPFP LK_Installation