Holley Terminator X Max Kit - 7.3L Godzilla by Holley

Holley Terminator X Max Kit - 7.3L Godzilla

Easily wire up and control your 7.3L Godzilla crate engine using this Holley Terminator X Max kit!

Item #HLY-5501431
MPN# 550-1431

Everyday Low Price: $1,499.95

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  • Ford Mustang - 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Fitment Notice
  • Due to the custom nature of this product, please be sure to read all installation manuals provided.
  • Compatible with any manual transmission but would require making or sourcing transmission-specific harness to wire into the Terminator. 
Product Highlights
  • The harness included in this kit was meticulously measured to be routed through the firewall, imitating the factory wiring harness.
  • This is a NO LAPTOP REQUIRED kit! Simply enter the information about your specific engine combination into the wizard on the 3.5" handheld touchscreen and the ECU will build a tune map around your specifications the more the car is driven! No need to be an EFI or tuning expert!
Tuning & Software Note
  • Holley provides the Terminator X Tuning Software for free to completely control your power plant!
  • The Tuning Software Lists Injector Data For Varying Applications.


  • Real-Time Self-Learning Fuel Strategies
  • Built-In Boost & Nitrous Control
  • Plug & Play Harnesses
  • On-Board Diagnostics


  • Pre-Loaded With Base Maps
  • High Impedance Injector Drivers
  • Customizable Gauge Display
  • Built-In 1 Bar MAP Sensor

 What's in the Box

  • (1) Terminator X ECU
  • (1) 3.5" Touchscreen LCD Handheld
  • (1) Primary Engine Harness
  • (1) Power Harness
  • (1) Injector Harness
  • (1) Drive-By-Wire Harness
  • (1) Bosch LSU 4.9 Wideband Oxygen Sensor
  • (1) Built-In 1 Bar Manifold Absolute Pressure Sensor

Terminator X Max Kit - 7.3L Godzilla
Take control of your 7.3L Ford Godzilla and transform the power, efficiency, and drivability with Holley's Terminator X Max Kit! Don't settle for a factory control pack with limited tuning ability and no self-learning capability when you can have complete control of your engine, self-learning fuel strategies, and the proven, race-winning technology of Holley's EFI at a budget-friendly price! The Terminator X Max features real-time fuel learning, high impedance injector drivers, an integrated 1 bar MAP sensor, and 4 programmable inputs and outputs. Holley manages to fully integrate Ford's factory oil pump control and variable valve camshaft timing with this Holley Terminator Max system. The added inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. The Terminator X comes fully loaded with base maps for your Godzilla engine 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 gauges and display functions. Holley EFI's industry-leading, easy-to-use software is provided to allow full laptop access for advanced tuning. Whether you are building a budget beater or a boosted race car, Holley EFI's Terminator X has the features and technology you need at a price that won't break the bank!

Full List of Features:
  • Seamlessly integrates with your 7.3-liter Ford Godzilla engine for easy installation
  • No need for extensive modifications; enjoy a hassle-free setup
  • Base Calibrations included in the free Terminator X Software and Handheld Wizard - OEM VVT and Oil pump control pre-configured
  • Godzilla Crank Sensor Module included, must be used in-line with factory crank sensor
  • OEM Oil pump control and VVT Control built into both Godzilla main harnesses, these features utilize 2 inputs and are pre-configured in the base calibrations.
  • Customizable tuning parameters allow you to tailor performance to your specific driving preferences.
  • Drive-by-wire kits require the use of the specific OEM throttle bodies and throttle pedals: Throttle Body - JL3E-9F991-AA – Throttle Pedal - BR3Z-9F836-D. 
  • Real-time fuel map learning takes the guesswork out of tuning your base fuel table.
  • High Impedance Injector Drivers will safely power most OEM injectors, and Holley EFI Injectors. (Will not control Low Impedance Injectors)
  • All of the new Terminator X Max systems utilize the Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control.
  • On-Board 1BAR MAP sensor, is perfect for N/A or Nitrous engine combos.
  • MAP Sensor vacuum hose adapters (1/8th – ¼ and 3/16ths)
  • 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, activation triggers for nitrous activation, or a trans brake.
  • 4 Outputs – Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
  • Boost Control – Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
  • Nitrous Control – Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
  • Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for any custom tables you can dream up, such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety!
  • On-board Diagnostic LEDS for ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, and Cam Signal.
  • The included 3.5-inch Touchscreen Handheld contains a calibration wizard, that allows you to quickly build a base tune for any Godzilla engine. Additionally, the handheld provides internal data-logging and a fully customizable gauge display.
  • The compact ECU size allows you to mount it virtually anywhere. Remember, diagnostic LEDS must face up!
  • Plug and play compatible with more Holley EFI accessories such as; analog-style gauges, EGT module, as well as 5-inch, 6.86-inch, and 12.3-inch Digital Dashes.
  • Free EFI Tuning Software for complete control of your Terminator X power plant

Holley Warranty - Click Here

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About This Brand

Holley, The Heart & Soul of Performance.

For over 100 years Holley has been proven to be an industry leader by providing Mustang enthusiasts and racers with the high performance carburetors , intake manifolds, cylinder heads, and other quality performance components needed for today's competition. Holley's performance Mustang parts are perfect for any daily driven or high horsepower race car.
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