Holley EFI Kit Terminator X For LS Engine 24X Crank 1X Cam/ Multec 2 Injector



  • Made in the USA
  • Real Time Fuel Maps
  • Custom Configurations
  • Boost and Nitrous Control
MSRP $1,983.00
You save 10%

Holley Terminator X EFI Kit for LS Engines with 24x Crank, 1X Cam and Multec 2 Injectors.

Included in the Holley Terminator X EFI Kit 550-917 is an integrated 1bar MAP sensor and four programmable inputs and outputs to begin mapping your LS Engine with 24x Crank, 1X Cam and Multec 2 Injectors. The proven American-made technology behind the Terminator X EFI conversion is the result of boost control solenoids, progressive nitrous control, fully loaded base maps and free configuration software! Now you can create advanced tables to satisfy your curiosity over fuel, oil pressure, the choices are endless in the data-logging seen from a 3-1/2" handheld touchscreen wizard. 

Features and Benefits:
- Real-Time Fuel Map Learn Learning
- High Impedance Injector Drivers Safely Powers Most Stock LS/Holley injectors
- Bosch LSU 4.9 Wideband Relays AFR Information to ECU for Precise Tuning Control
- On-Board 1Bar MAP Sensor for Nitrous Engine Combos
- MAP Sensor Vacuum Hose Adapters 
- 4 Inputs/Outputs
- Boost Control over Time, Gear, RPM, Speed, and Boost Safeties
- Nitrous Control over Single Wet/Dry Channels, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR Adjustable
- 3-1/2” Full-Color Touchscreen Handheld Wizard
- On-Board Diagnostic LEDs for ECU Power, Engine Run, Wideband Status, TPS Calibration, and Crank/Cam Signal
- Easily Identify Critical Engine Issues At-a-Glance
- Free EFI Tuning Software Controls Terminator X Power Plant

Take control of your LS engine with Terminator X Max. The 3-1/2" touchscreen LCD handheld contains an easy-to-use calibration wizard as well as tuning and gauge display functions. Tuning your LS engine is easier with advanced tables like 4x 1D, 1x 1D per Gear Table, and 4x 2D, 1x 2D Gear table. The 12V ground, 5V, Frequency four inputs are for pressure sensors or activation triggers for nitrous activation or trans braking. Additionally, the four ground, PWM outputs are for fans, boost control, nitrous control, IAC kit, and more!

- 24x LS Engine Main Harness
- Multec 2 Injector Harness
- 4L60E/4L80E Transmission Control Harness
- Terminator X MAX ECU
- ECU Main Power Harness
- Bosch LSU 4.9 Wideband Oxygen Sensor
- Input/Output Harness
- Assorted Vacuum Adapters (1/8th –1/4th and 3/16ths)

- GM LS 4.8/5.3/6.0 Truck Engines with 24x Crank Reluctor, Transmission Control, and Multec 2 Injectors

Additional Notes:
- The injector support chart provided in the instructions will not control Low Impedance Injectors.
- If your combination requires a 2+Bar, GM 12592525 and adapter P/N 558-416 are recommended.
- The compact ECU size allows you to mount it virtually anywhere, but diagnostic LEDS must face up.
- Plug-and-play compatible with more Holley EFI accessories such as analog-style gauges, shift lights, various modules, and a 12.3" digital dash support.

California Residents: Proposition 65 Warning

Only for use on pre-pollution controlled vehicles: This product can be used on vehicles that were manufactured before emissions control regulations were imposed. Pre-pollution vehicles are defined as:

  • 1965 and older U.S. manufactured California certified vehicles
  • 1967 and older U.S. manufactured federally certified vehicles

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following C/K years:

  • 1988,
  • 1989,
  • 1990,
  • 1991,
  • 1992,
  • 1993,
  • 1994,
  • 1995,
  • 1996,
  • 1997,
  • 1998,

This product will fit the following C10 years:

This product will fit the following F-100 years:

  • 1948,
  • 1949,
  • 1950,
  • 1951,
  • 1952,
  • 1953,
  • 1954,
  • 1955,
  • 1956,
  • 1957,
  • 1958,
  • 1959,
  • 1960,
  • 1961,
  • 1962,
  • 1963,
  • 1964,
  • 1965,
  • 1966,
  • 1967,
  • 1968,
  • 1969,
  • 1970,
  • 1971,
  • 1972,
  • 1973,
  • 1974,
  • 1975,
  • 1976,
  • 1977,
  • 1978,
  • 1979,

This product will fit the following Mustang years:

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