{"product_id":"fueltech-ft450-550-4-cylinder-universal-a-harness","title":"FuelTech FT450\/550 4 Cylinder Universal A Harness","description":"\u003cp\u003eThe FT450\/550 4 Cylinder Universal A Harness gives a four-cylinder build a complete plug-and-play loom for an FT450 or FT550. It runs four injectors and four individual smart coils in semi-sequential fuel and wasted spark, with every connector labeled and insulation that resists heat, moisture and oil. It is the only harness an FT450 needs; FT550 owners add the B expansion harness for full sequential and the extra I\/O.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4 EV1 injector outputs and 4 smart coil outputs\u003c\/li\u003e\n\u003cli\u003eSemi-sequential or multipoint injection with wasted spark\u003c\/li\u003e\n\u003cli\u003eWorks with high or low impedance injectors\u003c\/li\u003e\n\u003cli\u003eReady for FuelTech Peak \u0026amp; Hold external drivers\u003c\/li\u003e\n\u003cli\u003eReady for FuelTech WB-O2 Nano with Bosch LSU 4.2 sensor\u003c\/li\u003e\n\u003cli\u003eGM-style intake air and engine temperature sensor connectors\u003c\/li\u003e\n\u003cli\u003e2 pressure sensor inputs (fuel, oil or another 0-5V sensor)\u003c\/li\u003e\n\u003cli\u003eCrank and cam connectors with VR and Hall options\u003c\/li\u003e\n\u003cli\u003eExtra output connector for general use\u003c\/li\u003e\n\u003cli\u003e3 relays with built-in fuses for main electronics, injectors and coils\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation notes\u003c\/h3\u003e\n\u003cp\u003eLow impedance injectors need a FuelTech Peak \u0026amp; Hold driver. High impedance injectors only need the bypass jumper in the driver connector. To energize the coil and injector relays, output Blue #6 must be configured as Fuel Pump or RPM activation.\u003c\/p\u003e\n\u003ch3\u003eRelated parts\u003c\/h3\u003e\n\u003cp\u003eFull sequential injection and the FT550's extra inputs and outputs require the FT550 4 Cylinder Universal B Expansion Harness, sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/files.fueltech.net\/manual\/Ingles\/4_cylinder_Harness.pdf\" target=\"_blank\" rel=\"noopener\"\u003eFuelTech FT450\/FT550 4 cylinder universal harness manual (PDF)\u003c\/a\u003e\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Which ECUs does the 4 cylinder universal A harness fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The FuelTech FT450 and FT550.\"}},{\"@type\":\"Question\",\"name\":\"Does it run full sequential injection?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. On its own it runs semi-sequential injection and wasted spark. Full sequential requires the FT550 and the 4 Cylinder Universal B Expansion Harness.\"}},{\"@type\":\"Question\",\"name\":\"Can I use high impedance injectors?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It works with high or low impedance injectors. Low impedance needs a Peak and Hold driver, and high impedance only needs a bypass jumper in the driver connector.\"}},{\"@type\":\"Question\",\"name\":\"What crank and cam sensors does it support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is set up for either VR or Hall effect crank and cam sensors.\"}},{\"@type\":\"Question\",\"name\":\"Is this all I need for an FT450?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The A harness is all the FT450 requires. The FT550 needs the B expansion harness to use all of its extra inputs and outputs.\"}},{\"@type\":\"Question\",\"name\":\"How are the injector and coil relays switched?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Output Blue #6 must be configured as Fuel Pump or RPM activation to energize the coil and injector relays.\"}}]}\u003c\/script\u003e","brand":"FuelTech","offers":[{"title":"Default Title","offer_id":50629659787481,"sku":"2002006505","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2734\/8185\/files\/FT450_5504CylinderUniversalA.png?v=1791473532","url":"https:\/\/www.autosportsengineering.com\/products\/fueltech-ft450-550-4-cylinder-universal-a-harness","provider":"Autosports engineering","version":"1.0","type":"link"}