Terminator X Max brings complete standalone engine control to Gen IV GM 4.8/5.3/6.0 truck engines and LS2/LS3, with drive-by-wire throttle body 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 4.8/5.3/6.0 LS truck engines and LS2/LS3 with 58x crank, 4x cam, EV6 injectors, and drive-by-wire throttle body 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 (GM 12592525 sensor plus 558-416 adapter recommended for 2+ bar boosted applications)
- 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
- Recommended drive-by-wire pedal: P/N 10379038
Specifications:
- Engine: Gen IV GM LS Truck / LS2/LS3
- Crank Reluctor: 58x, Cam Signal: 4x
- Injector Connector: USCAR (EV6)
- Drive-By-Wire: Yes | Transmission Control: None
- MAP Sensor: 1-bar, integrated
- Handheld Included: Yes, 3.5 in. touchscreen
- Includes: 58x/4x LS Engine Main Harness, EV6 Injector Harness, DBW Throttle Body Harness, Terminator X Max ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband O2 Sensor, I/O Harness, vacuum adapters
- Part Number: 550-931
Designed to work with GM throttle body P/N 12570790 or 12580760, and GM throttle pedal P/N 10379038. Terminator X ECUs are designed to be mounted with the LEDs facing up.
FAQ
What engines is the 550-931 Terminator X Max system designed for?
It's built for GM Gen IV LS truck engines (4.8/5.3/6.0) and LS2/LS3 engines with a 58x crank, 4x cam, and drive-by-wire throttle body 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.
Which throttle body does this system support?
It's designed to work with GM throttle body part numbers 12570790 and 12580760.
Can this system run boosted applications above 1 bar?
For boosted combinations requiring 2+ bar, Holley recommends the GM 12592525 MAP sensor with the 558-416 adapter harness.
How should the ECU be mounted?
The Terminator X Max ECU should be mounted with its diagnostic LEDs facing up.
