Holley Terminator X, GM LS1/LS2/LS6, DBC, EV6 | 550-909

Terminator X puts complete control of a GM LS1/LS6 engine in one compact ECU, replacing a junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology at a budget-friendly price.

Key Features:

• Built for GM LS1/LS6 engines with 24x crank reluctor and EV6 injectors
• Real-time fuel map learn takes the guesswork out of tuning the base fuel table
• High-impedance injector drivers safely power most stock LS and Holley EFI injectors
• Bosch LSU 4.9 wideband oxygen sensor included for accurate AFR reading and tuning control
• On-board 1-bar MAP sensor, ideal for N/A or nitrous combinations
• 4 programmable inputs for pressure sensors, nitrous activation, or a trans brake
• Boost control and nitrous control tables, plus advanced custom tables
• On-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal
• 3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display
• Compact ECU mounts virtually anywhere (diagnostic LEDs must face up)
• Plug-and-play compatible with Holley EFI gauges, shift lights, modules, and digital/pro dashes
• Free EFI tuning software for full laptop access
• Includes 24x LS main harness, EV6 injector harness, ECU, main power harness, wideband oxygen sensor, I/O harness, and vacuum adapters

Specifications:

• Engine: GM LS1/LS2/LS6
• Crank Reluctor: 24x
• Ignition Type: GM LS 24x
• Injector Connector: USCAR (EV6)
• Drive-By-Wire: No
• Transmission Control: None
• MAP Sensor: 1-bar
• Handheld Included: Yes, 3.5 in. touchscreen
• Part Number: 550-909

Terminator X ECUs are designed to be mounted with the LEDs facing up.

FAQ

What engines does 550-909 fit?

GM LS1/LS6 engines with a 24x crank reluctor and EV6 injectors.

Does it include transmission control?

No, this version has no transmission control — fuel and spark only.

Is a handheld tuner included?

Yes, a 3.5 in. touchscreen handheld with a calibration wizard is included.

How should the ECU be mounted?

With the diagnostic LEDs facing up.