Skip to product information
1 of 7


(550-917-6) Holley Terminator X MAX 24X Early Truck With 6L80 Control

(550-917-6) Holley Terminator X MAX 24X Early Truck With 6L80 Control

Regular price $2,249.95 USD
Regular price Sale price $2,249.95 USD
Sale Sold out

24x Crank - 1x Cam - Multec 2 Injectors - 6L80/90 Transmission Control - 3.5-inch Touchscreen

Take control of your LS engine and 6L80 transmission with our Terminator X Max bundle kits! Best of all, you can save up to $90 by purchasing our kits versus the separate components. Part numbers 550-917-6, 550-918-6 and 550-928-6 add GM 6L80 and 6L90 control to the ever growing lineup of high performance Terminator X Products. Terminator X Max comes fully loaded with engine tunes for common LS engine combinations to get you out of the garage and on the road/track fast. The 3.5-inch 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! Additional features include real-time fuel learn, high impedance injector drivers, an integrated 1 BAR 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. A departure from traditional Holley EFI transmission control, the Terminator X Max ECU allows the ability to use 2007+ GM 6L80E and 6L90E transmissions by communicating via CAN with the internal TCM (Transmission Control Module). The supplied Holley EFI OBDII Transmission Tuning Handheld is used to adjust Shift Points, Tire Size and Gear Ratio. The Terminator X V3 Software provides the ability to dial in Torque Management to optimize the desired shifting characteristics when using a 6L80/90E Transmission. Terminator X V3 software also allows a user to control the Secondary Shift Mode within the Transmission TCM and allows use of Tap Up/Down Shifting.


  • Included TCM handheld tuner with integrated wizard is required for setup in conjunction with the Terminator X 3.5-inch Handheld. Terminator X V3 software to unlock optional tuning parameters.

  • Supports – Shift Mode – Tap Up / Tap Down, and Torque Management

  • Four loose wires:

  • o Power (Red) – Supplies power to the transmission solenoids. This should be connected directly to the battery, or a constant battery source capable of supplying 5 amps

  • o Ground (Black) – Connect to a good chassis/engine ground source

  • o Brake Switch (Light Blue/White) – Wired to the brake light switch. This must be installed to a +12v source (as most brake light switches are)

  • o Park/Neutral Safety (Yellow) – Circuit for starter solenoid. When the transmission is in Park or Neutral this Yellow Wire will be Grounded (-). When the transmission is in gear this circuit will be open.

  • 550-917-6 For GM LS 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, 6L80/90e Transmission Control, and Multec 2 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 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. If your combination requires a 2+Bar, we recommend GM 12592525, and our adapter part number 558-416.

  • 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, or 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 –Cam Signal. Allow you to identify any Critical engine issues at a glance

  • The included 3.5-inch Touchscreen Handheld contains a calibration wizard, that allows you to quickly build a base tune for any LS 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, shift lights, various modules, as well as 5, 6.86 and 12.3-inch Digital Dashes

  • Free EFI Tuning Software for complete control of your Terminator X power plant

  • Recommended Pedal part number - 10379038

Emissions Regulations

Some of the parts sold on our store are illegal to install on an emissions controlled vehicle. Please check with your local state / city emissions office to verify whether this item is legal for installation on your vehicle.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

1965 and older U.S. manufactured California Certified vehicles

1967 and older U.S. manufactured Federally Certified vehicles

1967 and older Foreign manufactured vehicles

The following vehicles are considered Emissions Controlled Vehicles:

1966 and newer U.S. manufactured California Certified vehicles

1968 and newer U.S. manufactured Federally Certified vehicles

1968 and newer Foreign manufactured vehicles

Shipping & Returns

Shipping calculated at checkout

Pickup avalable on most items

Click to see Return/Refund Policy

View full details