{"product_id":"holley-terminator-x-550-905t","title":"Holley Terminator X, GM Gen IV 4.8\/5.3\/6.0 Truck \u0026 LS2\/LS3, DBC, EV6 | 550-905T","description":"\u003cp\u003eThis Terminator X system gives GM Gen IV LS engines (4.8\/5.3\/6.0 truck and LS2\/LS3) real-time fuel learn, high-impedance injector drivers, an integrated 1-bar MAP sensor, and full ignition timing control in one compact, throttle-body-mounted ECU. It ships loaded with base maps for common LS combinations to get a stock engine running quickly, while still offering the tuning depth needed for boosted or nitrous-fed builds. Instead of a handheld display, this kit includes a USB\/CAN tuning cable, with setup and tuning handled through Holley's free Terminator X software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDesigned for GM LS engines with 58x crank, 4x cam signal, and EV6 (USCAR) injectors\u003c\/li\u003e\n\u003cli\u003eReal-time fuel map learn removes much of the guesswork from base fuel table tuning\u003c\/li\u003e\n\u003cli\u003eHigh-impedance injector drivers safely power most stock LS injectors and Holley EFI injectors (does not control low-impedance injectors; injector support chart included in instructions)\u003c\/li\u003e\n\u003cli\u003eBosch LSU 4.9 wideband oxygen sensor relays AFR data to the ECU for accurate, precise tuning\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-bar MAP sensor with vacuum hose adapters (1\/8in, 1\/4in, and 3\/16in) included\u003c\/li\u003e\n\u003cli\u003e4 programmable inputs (12V, ground, 5V, frequency) for pressure sensors, nitrous activation triggers, or a trans-brake\u003c\/li\u003e\n\u003cli\u003e4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, idle air control, and more\u003c\/li\u003e\n\u003cli\u003eBoost control strategies: boost vs. time, boost vs. gear, boost vs. RPM, boost vs. speed, plus boost safeties\u003c\/li\u003e\n\u003cli\u003eNitrous control: single channel, wet or dry, progressive or non-progressive, with rich\/lean safeties and closed-loop AFR targeting\u003c\/li\u003e\n\u003cli\u003eOn-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal\u003c\/li\u003e\n\u003cli\u003eAdvanced programmable tables: four 1D tables, one 1D per-gear table, four 2D tables, and one 2D per-gear table for custom uses such as a flex-fuel sensor offset table or a fuel\/oil pressure safety\u003c\/li\u003e\n\u003cli\u003eCompact ECU can be mounted virtually anywhere, provided the diagnostic LEDs face up\u003c\/li\u003e\n\u003cli\u003ePlug-and-play compatible with Holley EFI gauges, shift lights, and digital\/Pro Dash displays (Holley part numbers 553-106, 553-111, and 553-112)\u003c\/li\u003e\n\u003cli\u003eFree EFI tuning software included for full laptop-based control\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProduct Type: EFI System (Terminator X)\u003c\/li\u003e\n\u003cli\u003eEngine: GM Gen IV LS, 4.8\/5.3\/6.0 Truck \u0026amp; LS2\/LS3\u003c\/li\u003e\n\u003cli\u003eIgnition Type: GM LS 58x\u003c\/li\u003e\n\u003cli\u003eCrank Reluctor: 58x, 4x cam\u003c\/li\u003e\n\u003cli\u003eInjector Connector: USCAR (EV6)\u003c\/li\u003e\n\u003cli\u003eHandheld Included: No (USB\/CAN tuning cable)\u003c\/li\u003e\n\u003cli\u003eDrive-By-Wire: No\u003c\/li\u003e\n\u003cli\u003eTransmission Control: None\u003c\/li\u003e\n\u003cli\u003eMAP Sensor: 1 Bar\u003c\/li\u003e\n\u003cli\u003eIncludes: 58x\/4x LS main harness, EV6 injector harness, ECU, ECU main power harness, Bosch LSU 4.9 wideband O2 sensor, I\/O harness, vacuum adapters\u003c\/li\u003e\n\u003cli\u003ePart Number: 550-905T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eECU is designed to be mounted with its diagnostic LEDs facing up. This kit does not include transmission or drive-by-wire throttle body control — for those features, Holley's Terminator X Max is the step-up option.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eWhat engines does the Holley Terminator X 550-905T support?\u003c\/h5\u003e\u003cp\u003eGM Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3 engines with a 58x crank \/ 4x cam signal and EV6 (USCAR) injectors.\u003c\/p\u003e\u003ch5\u003eDoes this kit include a handheld display?\u003c\/h5\u003e\u003cp\u003eNo. This Terminator X kit uses a USB\/CAN tuning cable instead of a handheld, so initial setup and tuning run through Holley's free Terminator X software.\u003c\/p\u003e\u003ch5\u003eWhat kind of injectors will this ECU control?\u003c\/h5\u003e\u003cp\u003eHigh-impedance injector drivers that safely power most stock LS injectors and Holley EFI injectors. It will not control low-impedance injectors; an injector support chart is included in the instructions.\u003c\/p\u003e\u003ch5\u003eCan this ECU control boost or nitrous?\u003c\/h5\u003e\u003cp\u003eYes. It includes boost control strategies (boost vs. time, gear, RPM, and speed, with safeties) and single-channel wet or dry nitrous control, progressive or non-progressive, with AFR safeties.\u003c\/p\u003e\u003ch5\u003eHow should the ECU be mounted?\u003c\/h5\u003e\u003cp\u003eWith the diagnostic LEDs facing up, per Holley's installation guidance.\u003c\/p\u003e\u003ch5\u003eDoes the Terminator X support transmission or drive-by-wire control?\u003c\/h5\u003e\u003cp\u003eNo, this version (550-905T) handles fuel and spark only, with no transmission or drive-by-wire throttle body control. Holley's Terminator X Max adds those features.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What engines does the Holley Terminator X 550-905T support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"GM Gen IV 4.8\/5.3\/6.0 truck engines and LS2\/LS3 engines with a 58x crank \/ 4x cam signal and EV6 (USCAR) injectors.\"}},{\"@type\":\"Question\",\"name\":\"Does this kit include a handheld display?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This Terminator X kit uses a USB\/CAN tuning cable instead of a handheld, so initial setup and tuning run through Holley's free Terminator X software.\"}},{\"@type\":\"Question\",\"name\":\"What kind of injectors will this ECU control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"High-impedance injector drivers that safely power most stock LS injectors and Holley EFI injectors. 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Holley's Terminator X Max adds those features.\"}}]}\u003c\/script\u003e","brand":"Holley EFI","offers":[{"title":"Default Title","offer_id":42418569478192,"sku":"GVMR_550-905T","price":1349.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/term-x-w-tuner-cable19277_666d9e87-5d6f-4b8f-8cb6-149af6d4c8be.jpg?v=1758384334","url":"https:\/\/berryperformancesales.com\/products\/holley-terminator-x-550-905t","provider":"Berry Performance Sales","version":"1.0","type":"link"}