N55 HPFP Flow Capacities
The table below serves as a reference for maximum fuel flow in cubic centimeters per camshaft revolution for various N55 fuel pump options. These calculations are based on the stock N55 cam lobe unless otherwise noted (Lift Kit).
| Pump Model | Fuel Flow (cc/rev) | Fuel Flow w/ Dorch Lift Kit (cc/rev) |
|---|---|---|
| HDP5 (Stock N55) | 0.837 | NOT COMPATIBLE |
| HDP5 Evo (Stock B58) | 0.897 | NOT COMPATIBLE |
| HDP6 (Stock B58TU) | 1.107 | NOT COMPATIBLE |
| Dorch Engineering Stage 1 | 1.221 | 1.818 |
| Dorch Engineering Stage 2 | 1.465 | 2.181 |
This fuel flow equates to never before seen DI power numbers! When combined with larger injectors and our Stage 1 pump, this product will support 750whp on E10 and 600whp on E85. When combined with larger injectors and our Stage 2 pump, this product will support 900whp on E10 and 750whp on E85.
Software changes are required to run this upgrade, but we do have preset optimized maps available via Bootmod3 and MHD (coming soon). Simply check the box for the appropriate “Lift Kit” upgrade when flashing.
NOTE: When pushing much beyond the flow capacity of our existing Stage 2 HPFP kit, the N55 is very much limited by the injectors. In order to see the full potential of this upgrade, it is highly recommended to upgrade to the larger S63 EU5 Injectors.
Kit Contents:
- Dorch Lifetime Warranty
- Dorch Vacuum Pump Assembly
- Dorch HPFP Mounting Flange
- Vacuum Pump Sealing Cap
- Vacuum Pump Gasket
Kit Fitment:
F87 – M2
F20/21 – 135i, 135xi
F22/23 – 235i, 235xi
F30/31/34 – 335i, 335xi
F32/33/36 – 435i, 435xi
F10/11 – 535i, 535xi *
F25/26 – X3/X4 35i *
F15/16 – X5/X6 35i
E8X – 135i *
E9X – 335i *
E84 – X1 35i *
E70/71 – X5/X6 35i *
*ONLY 2013+ models with OE Bosch HPFP
KIT NOT COMPATIBLE with 2011-2012 N55 Vehicles
KIT NOT COMPATIBLE with OEM HPFP