Product Summary

Universal Fit, 24x Crank Reluctor, 1x Cam Trigger

  • Features real-time fuel map learn that takes the guess work out of tuning your base fuel table
  • Works with GM LS 4.8/5.3/6.0 truck engines with 24x crank reluctor, transmission control, and Multec 2 Injectors
  • Includes an on-board 1bar MAP sensor
  • 3.5" touchscreen handheld contains a calibration wizard, that allows you to quickly build a base tune for any LS engine
  • Plug and play compatible with more Holley EFI accessories
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Key Specs

MFG. Part #550-917
Ignition TypeFactory GM
Injector ConnectorMultec 2
Tuner StyleTouchscreen Handheld
Throttle StyleCable Driven
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Need To Know

Quick and Easy Returns

Return Policy

Holley 550-917 Details

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 550-917 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. 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:

  • For GM LS 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, Transmission Control, and Multec 2 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 AFRadjustable through included 3.5” full color touchscreen, base tune easily created via handheld Wizard!
  • 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

Application

For GM LS 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, Transmission Control, and Multec 2 Injectors.

Charts

Holley 550-917 Specifications

KEY SPECS
MFG. Part #550-917
BrandHolley
Ignition TypeFactory GM
Injector ConnectorMultec 2
Tuner StyleTouchscreen Handheld
Throttle StyleCable Driven
GENERAL
Crank Reluctor24x
Cam Trigger1x
MAP Sensor IncludedYes
Transmission ControlYes
Oxygen Sensor StyleBosch
GTIN Code090127060834
Sold in QuantityKit

Ratings & Reviews

5

3 Reviews

Overall Assessment

Customers consistently praise the product's high-quality harnesses and explicit labeling, leading to a straightforward installation process. Its compatibility with various car models, including 1978 Caprice classic aero coupe and 1960 Biscayne retromod, suggests its practicality and versatility. The product's ability to manage highly modified engines stands out, enhancing its usability. Feedback suggests it performs effectively in LS conversions, solidifying customer confidence in purchasing it again. It clearly sets itself apart from competitors, delivering robust performance, and easy-to-install features.

5

3 reviews

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Quality

5.0

4 years ago

Chpbuilder

Springfield mo

Verified

Have just started the installation on my LS conversion 1978 Caprice classic aero coupe. The harnesses are quality and well labeled. Can't wait to fire it up and see how well it will manage my highly modified engine. So far everything is easy as advertised.

Would Recommend

I would buy this product again

5.0

5 years ago

Horsepower saloon

Manistee,Mi

Verified

Used product in 1960 biscayne retromod

Would Recommend

Works Great

5.0

6 years ago

MikeD

Auburndale Florida

Verified

LS swap in a 1964 C10

Would Recommend

Showing 3 of 3 reviews

Questions & Answers

1 Question • 1 Answer

Does this kit come with the Drive by Wire Harness?

by Robert

• 4 years ago

1 answer

1 of 1 questions shown

Fitment

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Customer Impersonation Script