Terminator X MAX, Chevrolet, LS1, LS6, Drive By Wire, Engine EFI Management Systems, Each


$1,444.95 $1,299.95

Holley EFI Terminator X for LS1 and LS6 engines

47 in stock (can be backordered)

Brand : Holley EFI
Part Number : 550-929
UPC : 90127060858
Country of origin : US
Year : 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Size : 4.8L/293 LS1, 5.3L/325 LS1, 5.7L/346 LS6
Engine family : Chevy LS Series Gen-III/IV Small Block V8
Application :

Fits LS1 and LS6 engines with 24X crank trigger, 1x cam, and drive by wire throttle body.

No transmission Control**


Holley EFI Terminator X fits LS1 and LS6 engines with 24X crank trigger, 1x cam, and drive by wire throttle body.


  • For GM LS1/LS6 engines with 24x crank reluctor and a Drive-By-Wire Throttle Body, and EV1 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″ 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: 24x LS Engine Main Harness – EV1 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.

Additional information

Weight 9 lbs
Dimensions 13 × 12 × 9 in