Holley Fuel Injection Electronic Control Unit 550-919T; Terminator X Max for GM LS

$1,859.95

Part #: 550-919T

Brand: Holley

UPC: 090127074541

Estimated Ship Date: 1/18/2026 (From manufacturer)

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Details

  • Real Time Fuel Map
  • High Impedance Injector Drivers
  • Nitrous Control
  • Plug and Play Main Harness
  • Free EFI Tuning Software

Product Description

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 550-916 also has 4L60 or 4L80 Transmission 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. These Terminator X kits include a USB/CAN tuning cable instead of the 3.5" Handheld LCD, these kits require the use of the free Terminator X Software for initial setup. The Terminator X Software includes multiple base calibrations to choose from for either naturally aspirated or boosted engines. 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!

Specifications

Fuel Injection Electronic Control Unit Series:
Terminator X Max
Make:
GM
Engine:
LS
Injector Connector Style:
USCAR (EV6)
Features Ignition Control:
Yes
Features Throttle Control:
No
Features Transmission Control:
Yes
Notes:
For 24 Tooth Reluctors; Terminator X ECU's are designed to be mounted with the LED's facing up.
Quantity:
Sold As Kit

Videos

Tech Resources

  • Document 1

  • Document 2