Holley EFI Kit Terminator X For LS2/ LS3 Engine With 58X Crank 4X Cam/ EV6 Injector



  • Real-Time Fuel Map Learn
  • High-Impedance Injector Driver
  • Boost Control
  • Made in the USA
MSRP $2,287.00
You save 10%

Holley Terminator X EFI Kit for an LS2 or LS3 Engine with a 58X Crank Reluctor and 4X Cam with EV6 Injectors.

Featuring real-time fuel learn, high impedance injector drivers, and an integrated 1bar MAP sensor, the Holley Terminator X EFI Kit 550-928 gives you complete control of your engine! This EFI kit is compatible with LS2 or LS3 Engines with a 58X Crank Reluctor and 4X Cam with EV6 Injectors. Unlike cumbersome tuning interfaces, the kit includes a 3-1/2" touchscreen handheld with a calibration wizard so you can easily build a base tune for the LS engine in your ride.

Fully loaded with base maps for common LS engine combos, the LCD handheld provides internal data logging, tuning, and a fully customizable gauge display. It also includes Holley's innovative software suite with full laptop access for complete control of the Terminator X power plant. The at-a-glance touchscreen allows you to monitor and identify critical engine issues with onboard diagnostic LEDS for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal.

Features and Benefits: 
- Real-Time Fuel Map Learning
- Bosch LSU 4.9 Wideband Relays AFR Information to the ECU for Precise Tuning Control
- On-Board 1Bar MAP Sensor for Nitrous engine combos
- MAP Sensor Vacuum Hose Adapters
- 4 Inputs and Outputs
- Boost Control Over Time, Gear, RPM, Speed, and Safeties
- Nitrous Control Over Single Wet/Dry Channel, Progressive or Non-Progressive, Rich/Lean Safeties, and Target Closed Loop AFR
- Advanced, Customizable Tables
- On-Board Diagnostic LEDS for ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, and Cam Signal
- Compact ECU Mountable Anywhere
- High Impedance Injector Drivers Safely Power Most Stock LS injectors and Holley EFI Injectors
- Compatible with Various Holley EFI Accessories

Take advantage of the four programmable 12v, ground, 5v, and frequency inputs available for pressure sensors, activation triggers for nitrous activation, or a trans brake. The four outputs for ground and PWM are also available for accessories such as fans, boost control, nitrous control, IAC Kits, and more.

Customize your tables with Holley's advanced configurations, such as the 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, and 1x 2D per Gear Table tables. Whether you're looking to create a flex fuel sensor offset table or a custom fuel or oil pressure safety, Holley will meet your needs to get you out of the garage and on the road in no time!

Kit Includes:
- 58x/4x LS Engine Main Harness  
- EV6 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 
- Input/Output Harness
- Assorted Vacuum Adapters (1/8th – 1/4 and 3/16ths)

- GM LS 4.8/5.3/6.0 LS Engines and LS2/LS3 with 58x Crank Reluctor, 4x Cam and 4L60E/4L80E Transmissions, Drive-By-Wire Throttle Body Control, and EV6 Injectors

Tech Tips: 
- We recommend the following Pedal part p/n 10379038.
- If your combination requires a 2+Bar, we recommend GM 12592525, and our adapter part number 558-416.

Please Note: The injector support chart provided in the instructions will not control Low Impedance Injectors.

California Residents: Proposition 65 Warning

Related Categories: Mustang Parts, Mustang Electrical & Wiring, Mustang EFI Engine & Injector Harnesses, Mustang Engine, Ford Bronco Parts

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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