{"product_id":"bmw-n54-n55-spool-helix-hpfp-overdrive-unit","title":"BMW N54 \u0026 N55 Spool Helix HPFP Overdrive Unit","description":"\u003cp\u003eThe Spool Helix overdrive unit is a planetary gearbox that spins the N54 and early N55 high pressure fuel pump faster, so it can keep up with tuned power levels.\u003c\/p\u003e\u003ch2\u003eWhy you need it\u003c\/h2\u003e\u003cp\u003eWhen tuned, the factory HPFP can't pump fuel as fast as the injectors use it, so rail pressure drops. The Helix uses a ring gear, planet gears and a sun gear to raise pump shaft speed and add delivery strokes per cycle, increasing displacement without adding a port injection system. Spool's testing found overdriving the pump did not worsen its known failure modes.\u003c\/p\u003e\u003ch2\u003eFits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBMW N54\u003c\/li\u003e\n\u003cli\u003eBMW early N55\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePlanetary gear overdrive for the factory HPFP\u003c\/li\u003e\n\u003cli\u003eSupports up to 600 whp on full E85\u003c\/li\u003e\n\u003cli\u003eSupports 750+ whp on E60 mixes\u003c\/li\u003e\n\u003cli\u003eNo secondary port injection needed\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBillet vacuum cover\u003c\/li\u003e\n\u003cli\u003eMounting plate\u003c\/li\u003e\n\u003cli\u003eSupport bracket\u003c\/li\u003e\n\u003cli\u003eAll installation hardware\u003c\/li\u003e\n\u003cli\u003eHelix 10-micron filter unit (if selected)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eGood to know\u003c\/h2\u003e\u003cp\u003eChoose N54 or N55 and whether to add the Helix 10-micron filter unit. Tune changes are required, and Spool works with the major tuners to supply calibration changes. Professional installation is recommended.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"N54 \/ NO HELIX 10 MICRON FILTER UNIT","offer_id":46564564336725,"sku":"SP-BM-HELNOF","price":959.99,"currency_code":"USD","in_stock":true},{"title":"N54 \/ INCLUDE HELIX 10 MICRON FILTER UNIT [+$149]","offer_id":46564564369493,"sku":"SP-BM-HEL","price":1149.99,"currency_code":"USD","in_stock":true},{"title":"N55 \/ NO HELIX 10 MICRON FILTER UNIT","offer_id":46564564402261,"sku":"SP-BM-HEL2NOF","price":959.99,"currency_code":"USD","in_stock":true},{"title":"N55 \/ INCLUDE HELIX 10 MICRON FILTER UNIT [+$149]","offer_id":46564564435029,"sku":"SP-BM-HEL-2","price":1149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0638\/9769\/8389\/files\/helix_5.jpg?v=1793250943","url":"https:\/\/www.wrenchhaususa.com\/products\/bmw-n54-n55-spool-helix-hpfp-overdrive-unit","provider":"Wrench Haus","version":"1.0","type":"link"}