Terminator X Max puts complete control of a GM LS1/LS6 engine in one compact ECU. It replaces a cumbersome junkyard controller with real-time fuel learn, self-learning fuel strategies, and Holley's proven EFI tuning technology, plus 4L60E/4L80E transmission control and drive-by-wire throttle body control. This kit includes a USB/CAN tuning cable in place of the 3.5 in. handheld and uses the free Terminator X software for setup.
Key Features:
- Built for GM LS1/LS6 engines with 24x crank reluctor, EV1 injectors, 4L60E/4L80E transmission control, and drive-by-wire throttle body control
- 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 and 4 programmable outputs for fans, boost control, nitrous, and more
- Boost control and nitrous control tables, plus advanced custom tables for flex-fuel offset and pressure safeties
- On-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank and cam signal
- Includes USB/CAN tuning cable for real-time configuration and tuning via laptop
- 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
- Recommended pedal part number 10379038
- Includes 24x LS main harness, EV1 injector harness, DBW throttle body harness, 4L60E/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I/O harness
Specifications:
- Engine: GM LS1/LS2/LS6
- Crank Reluctor: 24x
- Ignition Type: GM LS 24x
- Injector Connector: Jetronic/Minitimer (Bosch EV1)
- Drive-By-Wire: Yes
- Transmission Control: 4L60E/4L80E
- MAP Sensor: 1-bar
- Handheld Included: No — USB/CAN tuning cable instead
- Part Number: 550-926T
Not recommended for 4x4 applications with electronic transfer cases, or for 4L6X transmissions from model year 1995 or earlier. Not intended for marine use, though it can be used off-road with proper mounting and wiring protection.
FAQ
Does 550-926T include a handheld display?
No — this kit includes a USB/CAN tuning cable instead of the 3.5 in. handheld, and requires the free Terminator X software for setup.
What engines does it fit?
GM LS1/LS6 engines with a 24x crank reluctor and EV1 injectors.
Does it control the transmission and throttle body?
Yes, it includes 4L60E/4L80E transmission control and drive-by-wire throttle body control.
Is a gas pedal included?
No — the recommended pedal is part number 10379038, sold separately.
Can this be used on a 4x4 vehicle?
It's not recommended for 4x4 applications with electronic transfer cases.
