{"product_id":"holley-terminator-x-gen-iii-truck-550-904","title":"Holley Terminator X, GM Gen III 4.8\/5.3\/6.0 Truck, DBC, Multec 2 | 550-904","description":"\u003cp\u003eTerminator X gives Gen III GM 4.8\/5.3\/6.0 truck engines complete standalone engine control, replacing a junkyard ECU and cumbersome tuning interface with real-time fuel learn and Holley EFI's proven tuning technology at a budget-friendly price. It comes fully loaded with base maps for common LS engine combinations to get you on the road fast.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 24x crank reluctor and Multec 2 injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes the guesswork from tuning the base fuel table\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS and Holley EFI injectors\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor included for accurate AFR feedback\u003c\/li\u003e\n\u003cli\u003eMAP sensor vacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for extra sensors, nitrous triggers, or a trans brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs for fans, boost control, nitrous control, IAC, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eSingle-channel wet or dry progressive nitrous control with rich\/lean safeties\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and gauge display\u003c\/li\u003e\n\u003cli\u003eCompact ECU mounts virtually anywhere (LEDs must face up)\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P\/N 553-106, 553-111, 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software for full laptop control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEngine: Gen III GM Truck (4.8\/5.3\/6.0)\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x, Cam Signal: 1x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Multec 2\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1-bar, integrated\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No | Transmission Control: None\u003c\/li\u003e\n\u003cli\u003eHandheld Included: Yes, 3.5 in. touchscreen\u003c\/li\u003e\n\u003cli\u003eIncludes: 24x LS Engine Main Harness, Multec 2 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I\/O Harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-904\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eTerminator X ECUs are designed to be mounted with the LEDs facing up.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines is the 550-904 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for Gen III GM 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld for tuning?\u003c\/h5\u003e\u003cp\u003eYes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\u003c\/p\u003e\u003ch5\u003eWhat injectors does this system support?\u003c\/h5\u003e\u003cp\u003eIt's set up for Multec 2 style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\u003c\/p\u003e\u003ch5\u003eCan I add boost or nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eThe Terminator X ECU should be mounted with its diagnostic LEDs facing up.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines is the 550-904 Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for Gen III GM 4.8\/5.3\/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld for tuning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.\"}},{\"@type\":\"Question\",\"name\":\"What injectors does this system support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's set up for Multec 2 style injectors and uses high-impedance injector drivers compatible with most stock LS and Holley EFI injectors.\"}},{\"@type\":\"Question\",\"name\":\"Can I add boost or nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it has 4 programmable inputs and outputs supporting boost control strategies and single-channel wet or dry progressive nitrous control.\"}},{\"@type\":\"Question\",\"name\":\"How should the ECU be mounted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The Terminator X ECU should be mounted with its diagnostic LEDs facing up.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569609264,"sku":"GVMR_550-904","price":1449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/diucjf3u1974_927d802d-7ce7-4b48-af99-8e2398621827.jpg?v=1758384349","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-gen-iii-truck-550-904","provider":"Berry Performance Sales","version":"1.0","type":"link"}