{"product_id":"dorch-n55-hpfp-upgrade","title":"Dorch Engineering N55 HPFP Upgrade","description":"\u003cp\u003e\u003cstrong\u003eDorch Engineering high-pressure fuel pump upgrades for the N55.\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eTwo options\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLift Kit\u003c\/strong\u003e — 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.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDS25 Stage 2\u003c\/strong\u003e — 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat you need to know\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003ePair with the calibration\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eInstall\u003c\/h3\u003e\n\u003cp\u003e~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.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003e2012-2018 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.\u003c\/p\u003e\n\u003cp\u003eIf you're sourcing fueling alongside the calibration, the \u003ca href=\"\/products\/fueling-kit-n55\"\u003eFueling Kit — N55\u003c\/a\u003e bundles the matched pump + tune for 8% under à la carte.\u003c\/p\u003e","brand":"Dorch Engineering","offers":[{"title":"Lift Kit (Stage 1 — ~+38% Flow, OEM Housing)","offer_id":43280686874685,"sku":"EW-FUEL-DORCH-N55-LIFT","price":1275.0,"currency_code":"USD","in_stock":true},{"title":"DS25 Stage 2 (Full Pump Upgrade, ~+25% Displacement)","offer_id":43280686907453,"sku":"EW-FUEL-DORCH-N55-DS25","price":2595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/2553\/8109\/files\/dorch_N55_DS3.webp?v=1781742887","url":"https:\/\/essewerks.com\/products\/dorch-n55-hpfp-upgrade","provider":"Esse Werks","version":"1.0","type":"link"}