Terminator X Max puts complete control of a GM LS Gen III 4.8/5.3/6.0 truck engine in one compact, throttle-body-mounted 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.
Key Features:
- Built for GM LS 4.8/5.3/6.0 truck engines with 24x crank reluctor, Multec 2 injectors, 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: boost vs. time, gear, RPM, and speed, plus boost safeties
- Nitrous control: single channel wet or dry, progressive or non-progressive, with rich/lean safeties
- Advanced custom tables for flex-fuel offset, fuel/oil pressure safeties, and more
- 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
- Recommended pedal part number 10379038 for DBW setup
- Includes 24x LS main harness, Multec 2 injector harness, DBW throttle body harness, 4L60E/4L80E transmission control harness, ECU, main power harness, wideband oxygen sensor, I/O harness
Specifications:
- Engine: Gen III GM Truck (4.8/5.3/6.0)
- Crank Reluctor: 24x
- Ignition Type: GM LS 24x
- Injector Connector: Multec 2
- Drive-By-Wire: Yes
- Transmission Control: 4L60E/4L80E
- MAP Sensor: 1-bar
- Handheld Included: Yes, 3.5 in. touchscreen
- Part Number: 550-927
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. Recommended pedal part number is 10379038.
FAQ
What makes 550-927 different from 550-917?
550-927 adds drive-by-wire throttle body control on top of 4L60E/4L80E transmission control.
What engines does it fit?
GM LS Gen III 4.8/5.3/6.0 truck engines with a 24x crank reluctor and Multec 2 injectors.
Is a handheld tuner included?
Yes, a 3.5 in. touchscreen handheld with a calibration wizard is included.
Is a gas pedal included?
No — the recommended pedal is part number 10379038, sold separately.
Can this be used on a 4x4 truck?
It's not recommended for 4x4 applications with electronic transfer cases.
