{"product_id":"holley-terminator-x-ls1-ls2-ls6-550-903","title":"Holley Terminator X, GM LS1\/LS2\/LS6, DBC, EV1 | 550-903","description":"\u003cp\u003eTerminator X gives GM LS1\/LS6 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 includes a 3.5 in. touchscreen handheld for calibration and gauge display right out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS1\/LS6 engines with 24x crank reluctor and EV1 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\u003eOn-board 1-bar MAP sensor, ideal for N\/A or nitrous combos (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)\u003c\/li\u003e\n\u003cli\u003eVacuum hose adapters included (1\/8, 1\/4, and 3\/16 in.)\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs for extra sensors, nitrous triggers, or a trans brake\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\u003eAdvanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS\/crank\/cam signal\u003c\/li\u003e\n\u003cli\u003eIncludes 3.5 in. touchscreen handheld with calibration wizard, data logging, and customizable 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: GM LS1\/LS2\/LS6\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 24x\u003c\/li\u003e\n\u003cli\u003eInjector Connector: Jetronic\/Minitimer (EV1)\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, EV1 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: 550-903\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 550-903 Terminator X system designed for?\u003c\/h5\u003e\u003cp\u003eIt's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV1 (Jetronic\/Minitimer) 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\u003eCan this system run boosted applications above 1 bar?\u003c\/h5\u003e\u003cp\u003eFor boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\u003c\/p\u003e\u003ch5\u003eCan I add nitrous control with this ECU?\u003c\/h5\u003e\u003cp\u003eYes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\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 550-903 Terminator X system designed for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It's built for GM LS1\/LS6 engines with a 24x crank reluctor and EV1 (Jetronic\/Minitimer) 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\":\"Can this system run boosted applications above 1 bar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.\"}},{\"@type\":\"Question\",\"name\":\"Can I add nitrous control with this ECU?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, it supports single-channel wet or dry progressive nitrous control with rich\/lean safeties.\"}},{\"@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":42418570264624,"sku":"GVMR_550-903","price":1449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/diucjf3u1974_ac587ca0-4a2c-44d6-aa37-36fad19a4091.jpg?v=1758384365","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-ls1-ls2-ls6-550-903","provider":"Berry Performance Sales","version":"1.0","type":"link"}