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Dorch Engineering N55 HPFP upgrade for BMW N55 — F-chassis

Dorch Engineering N55 HPFP Upgrade

$1,275.00

Dorch Engineering high-pressure fuel pump upgrades for the N55. The N55 OEM HPFP is the fuel-system bottleneck on tuned single-turbo I6 builds — Stage 2+ calibration pulls more fuel mass-flow than the factory pump can sustain, which surfaces as fuel pressure deviation codes, knock under load, and progressive engine wear if left unaddressed.

Two options

  • Lift Kit — Dorch's proprietary cam installed inside the OEM HPFP cartridge. More fuel flow on the factory pump body. Same OEM packaging, same OEM hard line connections, no fitment changes. Requires a core deposit — return your OEM pump cartridge to Dorch within 30 days, get the core refund.
  • DS25 Stage 2 — Full pump assembly with Dorch's larger-displacement cartridge. Bolt-in replacement for the OEM HPFP. No core required. The build path for Stage 3 N55 builds running E85 or methanol injection.

What you need to know

The N55 platform fuel system upgrade conversation usually starts with the Lift Kit because of the price and packaging simplicity. If you're targeting top-end Stage 3 N55 output or running aggressive E-blend fueling, the DS25 is the right call from the start — the Lift Kit eventually becomes the limiting factor at sustained high-flow operation.

Pair with the calibration

The Esse Werks N55 Stage 2 / Stage 3 calibrations are built around the higher fuel flow capacity these pumps deliver. Without the HPFP upgrade, our calibrations will pull fuel-pressure trim aggressively at boost to stay within OEM pump capacity — meaning you don't realize the full output the calibration is designed for. The pump upgrade is what gets you there.

Install

~2 hours at a competent shop. The HPFP sits on top of the N55 valve cover, accessible without removing the intake manifold. Lift Kit install requires disassembly of the OEM pump cartridge; DS25 install is a bolt-in replacement.

Fitment

2012-2018 BMW N55 applications. F-chassis 1/2/3/4 Series with N55 engine. F87 M2 (2016-2018 pre-Competition only — the M2 Competition uses the S55 engine, different HPFP). Confirm engine code at intake.

If you're sourcing fueling alongside the calibration, the Fueling Kit — N55 bundles the matched pump + tune for 8% under à la carte.

Fits engine N55
Fits chassis F20 · F21 · F22 · F23 · F30 · F31 · F32 · F33 · F36 · F87
Category Fuel
Manufacturer Dorch Engineering
Install effort ~2.5 hours
What this is

A Part Recalibration is one focused revision built around the part you just bought. We take logs on your car as it runs now, on your current tune, then make a single full revision so this specific part delivers what it should. Hardware only does its job with a calibration shaped around it.

We bundle that tuning with the part right here, whatever brand the hardware is. If you want a fresh start across all your hardware, a Full Tune is the step up: a new base map, three revisions, and a written report.

This is a bootmod3 calibration. We tune through your own active BM3 license, so you'll need bootmod3 active on your car to load it.

Ships from Boca Raton, FL.

Step up to a Full Tune?

You've added a Part Recalibration to more than one part. At that point a complete tune does more for you: a Full Tune lays down a fresh base map and three revisions so all of your new hardware is dialed in together, with a written report at the end. We can roll your recalibrations into one Full Tune for $395 — below our standalone Full Tune, which starts at $495 for a four-cylinder and $595 for a six.

The Full Tune is a bootmod3 calibration — it loads through your active BM3 license, the same one you confirmed for the recalibration.
WHY WE SHIP DORCH ENGINEERING
Dorch Engineering fills the gap where a single fuel system runs out of injector or pump to feed the power a build is asking for. Their high-pressure fueling work is built for the direct-injection BMW engines that hit a fuel-delivery wall before they hit a mechanical one. We choose Dorch when a customer commits to ethanol content or big-power targets that the factory HPFP and DI injectors can no longer support cleanly. This is fueling for the upper end of a build, where getting the supply right is the difference between a calibration that holds and one that runs lean where it matters.