Description
Holley EFI Terminator X Max — Gen III 4.8/5.3/6.0 GM Truck Engines
Take control of your LS engine with Terminator X Max. Don’t settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price.
Terminator X Max features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Part number 550-927 also has 4L60E or 4L80E Transmission control and Drive-By Wire Throttle Body control. Terminator X Max comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast.
The 3.5" touch screen LCD handheld contains an easy-to-use calibration wizard as well as tuning and gauge display functions. Also included is Holley EFI’s industry-leading, easy-to-use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won’t break the bank.
Key Features
- For GM LS 4.8/5.3/6.0 truck engines with 24x crank reluctor, transmission control, drive-by-wire throttle body control, and Multec 2 injectors
- Real-time fuel map learn — takes the guesswork out of tuning your base fuel table
- High impedance injector drivers safely power most stock LS injectors and Holley EFI injectors
- All Terminator X Max systems utilize the Bosch LSU 4.9 wideband for accurate AFR reading and precise tuning control
- On-board 1bar MAP sensor — perfect for N/A or nitrous engine combos
- 4 Inputs (12v, Ground, 5v, Frequency) for pressure sensors, nitrous activation, trans brake, and more
- 4 Outputs (Ground, PWM) for fans, boost control, nitrous control, IAC kit, and more
- Boost Control: Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, plus boost safeties
- Single-channel nitrous control: wet or dry, progressive or non-progressive, with rich/lean safeties
- On-board diagnostic LEDs for ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank/Cam Signal
- Included 3.5" touchscreen handheld with calibration wizard, internal datalogging, and fully customizable gauge display
- Compact ECU size — mount it 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 complete laptop-based control
What’s Included
- 24x LS Engine Main Harness
- Multec 2 Injector Harness
- DBW Throttle Body Harness
- 4L60E/4L80E Transmission Control Harness
- Terminator X MAX ECU
- ECU Main Power Harness
- Bosch LSU 4.9 Wideband Oxygen Sensor
- I/O Harness
- 3.5" Touchscreen LCD Handheld
Installation Notes
Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or before due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management.
Questions? Call (954) 406-8550 or contact us before ordering — we’re happy to discuss your setup and goals.
