Holley EFI

Holley Efi Terminator X - Gen Iv 4.8/5.3/6.0 Gm Truck Engines And Ls2/Ls3


Product details

Take control of your LS engine with Terminator X! 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 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. Terminator X 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 has the features and technology you need at a price that won't break the bank!


  • Designed for GM LS Engines with 58x Crank, 4x Cam - and EV6 Injectors.
  • Real-Time fuel map learn, takes the guess work out of tuning your base fuel table.
  • High Impedance Injector Drivers will safely power most Stock LS injectors, and Holley EFI Injectors. Injector support chart provided in the instructions (Will not control Low Impedance Injectors).
  • All of the new Terminator X systems utilize the Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control.
  • MAP Sensor vacuum hose adapters (1/8th – ¼ and 3/16ths).
  • 4 Inputs – 12v, Ground, 5v, and Frequency, for additional pressure sensors, nitrous activation triggers, 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.
  • On-Board Diagnostic LEDS for: ECU Power, Engine Run, Wideband Status, TPS Calibration, Crank Signal, Cam Signal. Allows you to identify any critical engine issues at a glance.
  • Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for custom tables such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety.
  • The included 3.5" Touchscreen Handheld contains a calibration wizard, internal data-logging, and a fully customizable gauge display.
  • The compact ECU size allows for versatile mounting options. Diagnostic LEDs must face up!
  • Plug and play compatible with more Holley EFI accessories such as analog style gauges, shift lights, various modules, and soon, 12.3" digital dash support!
  • Free EFI Tuning Software for complete control of your Terminator X power plant.
  • Includes: 58x/4x LS Engine Main Harness, EV6 Injector Harness, Terminator X ECU, ECU Main Power Harness, Bosch LSU 4.9 Wideband Oxygen Sensor, Input/Output Harness, and assorted vacuum adapters.

58x Crank - 4x Cam - EV6 Injectors - 3.5 in. Touchscreen