Terminator X Max gives GM LS1/LS6 engines complete standalone engine control with 4L60E/4L80E transmission control built in. It replaces a junkyard ECU with real-time fuel learn and Holley EFI's race-proven tuning technology, and includes a 3.5 in. touchscreen handheld for calibration and gauge display right out of the box.
Key Features:
- Designed for GM LS1/LS6 engines with 24x crank reluctor, EV1 injectors, and 4L60E/4L80E transmission control
- Real-time fuel map learn removes the guesswork from 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 feedback
- On-board 1-bar MAP sensor with vacuum hose adapters (1/8, 1/4, and 3/16 in.)
- 4 programmable inputs and 4 programmable outputs for fans, boost/nitrous control, IAC, and more
- Boost control strategies: vs. time, vs. gear, vs. RPM, vs. speed, plus boost safeties
- Single-channel wet or dry progressive nitrous control with rich/lean safeties
- Advanced tables: 4x 1D, 1x 1D per gear, 4x 2D, 1x 2D per gear for custom tuning needs
- On-board diagnostic LEDs for ECU power, engine run, wideband status, TPS/crank/cam signal
- Includes 3.5 in. touchscreen handheld with calibration wizard, internal data logging, and customizable gauge display
- Compact ECU mounts virtually anywhere (LEDs must face up)
- Plug-and-play compatible with Holley EFI gauges, shift lights, and dash accessories (P/N 553-106, 553-111, 553-112)
- Free EFI tuning software for full laptop control
Specifications:
- Engine: GM LS1/LS2/LS6
- Crank Reluctor: 24x
- Injector Connector: Jetronic/Minitimer (EV1)
- Drive-By-Wire: No | Transmission Control: 4L60E/4L80E
- MAP Sensor: 1-bar, integrated
- Handheld Included: Yes, 3.5 in. touchscreen
- Includes: 24x LS Engine Main Harness, EV1 Injector Harness, 4L60E/4L80E Transmission Control Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I/O Harness, vacuum adapters
- Part Number: 550-916
Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier. Not recommended for marine applications, but can be used off-road in a dry, protected, heat-shielded location with proper wiring management.
FAQ
What does the 550-916 control besides fuel and spark?
It adds 4L60E/4L80E automatic transmission control on top of standard Terminator X Max engine control.
Does this kit include a handheld for tuning?
Yes, it includes a 3.5 in. touchscreen handheld with a calibration wizard, data logging, and a customizable gauge display.
What injectors does this system use?
It's configured for EV1 (Jetronic/Minitimer) style injectors.
Will this work with a 4x4 vehicle?
It's not recommended for 4x4 applications with electronic transfer cases.
What transmissions are NOT supported?
4L6X transmissions from model year 1995 or earlier are not compatible due to converter lockup and downshift strategy changes.