Holley EFI 550-936 Terminator X MPFI System

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US$639.98
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US$639.98
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Free shipping Free 30-day returns

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Management number 254784956 Release Date 2026/11/07 List Price US$639.98 Model Number 254784956
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Universal MPFI Main Harness - EV1 Injector Harness, 3.5 in. Touchscreen Included;<br><br>Take control of your engine with Terminator X! Don't settle for a factory 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 NOS control, and much more. Terminator X comes fully loaded with base maps for common V8 engine combinations to get you out of the garage and on the road/track fast. The 3.5 in. 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!;

  • Plug and play Domestic V8 engine control, such as conventional push rod Chevrolet and Chrysler engines.
  • Includes EV1 Injector Harness
  • High Impedance Injector Drivers will safely power most Stock injectors, and Holley EFI Injectors. Injector support chart provided in the instructions (Will not control Low Impedance Injectors)
  • Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control.
  • Built in 1bar MAP Sensor, vacuum hose adapters included (1/8th â€" Â1/4 and 3/16ths) - or for Boosted applications, you can disable the internal MAP sensor, and utilize an external MAP Sensor, the harness comes with the connector terminated, making the in
  • MAP Sensor vacuum hose adapters (1/8th â€" Â1/4 and 3/16ths)
  • Plug and plug ignition capability with Dual Sync and HyperSpark Distributors, adapter 558-323 required for HyperSpark Distributors.
  • 4 Inputs â€" 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake
  • Boost Control â€" Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
  • Nitrous Control â€" Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
  • Advanced Tables â€" 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 â€" Engine Run â€" Wideband Status â€" TPS Calibration â€" Crank Signal â€"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 domestic V8 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
Compatible cars Domestic V8 engine
Vehicle make Chevrolet, Morris
Fuel injection accessory & part type Universal MPFI Main Harness
Brand Holley EFI
Automotive parts division Performance
Vehicle fitment type Specific
Items included EV1 Injector Harness, 3.5 in. Touchscreen
Manufacturer Holley EFI
Accessories EV1 Injector Harness, 3.5 in. Touchscreen, Holley EFI's industry-leading software suite
Features Easy To Use
Product line Terminator X
Series EFI
Model HOL550-936
Assembled product height 9.3 in
Weight 7.35 lb
Vehicle type Car
Volts 12 Volts

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