Holley EFI 550-903 Fuel Injection System
Holley EFI 550-903 Fuel Injection System
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Holley EFI 550-903 Fuel Injection System

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Key item features

  • For GM LS1/LS6 engines with 24x crank reluctor - with 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 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 â€" Â1/4 and 3/16ths)
  • 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 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
  • Includes: 24x LS Engine Main Harness - EV1 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Current price is $1,499.95
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Columbus, 43215
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5 out of 5 stars
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Showing 1-3 of 3 reviews

Aug 24, 2019
Orus
5 out of 5 stars review

Holden gm powered

Just received this pnp Holley ecu in New Zealand via USA, it looks great, no damage and I think it will do the job on my factory gen111 ls v8 car just fine.

Review from jegs.com
Helpful?60LC2G4G68AV749911047
Nov 10, 2019
Stude53
5 out of 5 stars review

Quality wiring harness and easy to program

This is my second Holley system this year and I love them ; usually use reliable ,very smart, and great diagnostics using the included 3.5 inch screen where you can pretty much do anything

Review from jegs.com
Helpful?60LC2G4G68AV749911047
Jul 2, 2021
Night train
5 out of 5 stars review

Awesome product

Got this product for the ease of tuning a twin turbo ls. Still trying to get the bugs worked out of the truck.

Review from jegs.com
Helpful?60LC2G4G68AV749911047