Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3

Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3

Regular price $1,799.95
$2,024.95 Sale price $1,799.95 Regular price
-11%
Shipping calculated at checkout.

Take control of your LS engine with Terminator X Max. 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 Max 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. Part number 550-931 also has Drive-By Wire Throttle Body control. Terminator X Max 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 MAX has the features and technology you need at a price that won't break the bank.

Features:

  • Designed for GM 4.8/5.3/6.0 LS Truck Engines and LS2/LS3 with 58x Crank, 4x Cam and a Drive-By-Wire Throttle Body, with 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
  • 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
  • 4 Outputs – Ground, PWM - for accessories such as fans, boost control, nitrous control, IAC Kit, and more
  • 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, activation triggers for nitrous activation, or a trans brake
  • 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" 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, and coming soon, 12.3" digital dash support
  • Free EFI Tuning Software for complete control of your Terminator X power plant
  • Recommended Pedal part number - 10379038
  • Includes: 58x/4x LS Engine Main Harness - EV6 Injector Harness - DBW Throttle Body Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters

Specs:

  • Accelerometer Support: Yes
  • Boost Control: Yes
  • Brand: Holley EFI
  • CAN-BUS Support: Yes
  • Category: Air and Fuel Delivery
  • Coil Per Cylinder Ignition Support: Yes
  • Crank Reluctor: 58x
  • Datalogging Support: Yes
  • Distributor Included: No
  • Drive-By-Wire: Yes
  • Dry Nitrous Control: Yes
  • e85 Support: Yes
  • EGT Support: Yes
  • Emission Code: 3
  • Engine: Gen IV GM LS
  • Forced Induction Support: Yes
  • Fuel Filter Included: No
  • Fuel Hose Included: No
  • Fuel Injectors Included: No
  • Fuel Pressure Regulator Included: No
  • Fuel Pump Included: No
  • Grade Type: Performance
  • Handheld Included: Yes
  • Idle Air Control Motor Included: No
  • Ignition Timing Control: Yes
  • Ignition Type: GM LS 58x
  • Individual Cylinder Fuel Corrections: Yes
  • Injector Connector: USCAR (EV6)
  • Intake Manifold Included: No
  • Knock Retard Support: Yes
  • MAP Sensor: 1bar
  • Mounting Hardware Included: No
  • Multi-Stage Nitrous Control: Yes
  • Product Type: EFI System
  • Progressive Nitrous Control: Yes
  • Self-Tuning: Yes
  • Terminator LS Options: Fuel, Spark, Drive-by-Wire
  • Throttle Position Sensor Included: No
  • Transmission: None
  • User-Tuneable: Yes
  • Wet Nitrous Control: Yes

Tech Resources:

Terminator X ECU's are designed to be mounted with the LED's facing up. Designed to work with GM Throttle body P/N's - 12570790 and 12580760 Designed to work with GM Throttle Pedal P/N - 10379038. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management.

Instructions - 199R11760 - 02.25.2025.pdf

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Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Holley EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3
Regular price $1,799.95
$2,024.95 Sale price $1,799.95 Regular price