SKU: 68083105834

Holley Terminator X MAX Engine Management Systems 550-929

Sale price$899.98 Regular price$999.98
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Ships within 48 hours · Estimated delivery Jul 14 - Jul 19

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Description

Holley Terminator X MAX Engine Management Systems 550-929Take 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

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 550-929 also has Drive-by wire throttle body 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 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.

Specs

Brand Holley EFI
Crank Reluctor 24x
Emission Code 3
Ignition Type GM LS 24x
Injector Connector Jetronic / Minitimer (Bosch)
Product Type Terminator X Max LS MPFI
Terminator LS Options Fuel, Spark, Drive-by-Wire
Part Number 550-929
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 68083105834

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Prudence Julien
Bozeman, US
★★★★★ 4
Good coverage
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
Great sunscreen and when applied liberally my face doesn't get burnt. That has always been a problem with my skin all my life so I'm happy for that sort of coverage. The formula is a little greasy and there is a white caste but I use it to my advantage as it dims the red spots on my face and brightens my under eye. I try not to leave the house without applying.
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Kelly
Dallas, US
★★★★★ 5
Smooth sunscreen
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
Great for mature skin. Not easy finding something for mature skin that doesn’t cake or flake off. Moisturizing. I will buy again !
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Reviewed in the United States on April 28, 2026
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Sarahshaw
Pawtucket, US
★★★★★ 5
Very glowy
Style: SPF 50, Size: 5 Fl Oz (Pack of 1), Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
I just opened this to try it so I can't speak on if it breaks me out but the expiration date is good it doesn't expire until next summer. It's not thick at all very liquid actually but not a messy. I skipped moisturizer today to see how the hydration will be. I have severe dry skin so we will see. Very oily, glowy, moisturizing. I used it on my face and arms. It left a beautiful glow on my face so we will see how long it's takes to soak in. No strong smell which is nice and it's a large bottle!
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Reviewed in the United States on May 25, 2026
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Michael Hardy
Bozeman, US
★★★★★ 5
Sunscreen
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Good product
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Geniphre
Chelsea, US
★★★★★ 3
Very moisturizing but clogged my pores
Style: SPF 50, Size: 5 Fl Oz (Pack of 1)
I like the texture of this sunscreen a lot, and it gives me a nice glow. However, it did cause me to break out a lot with small whiteheads so I had to discontinue using it.
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Reviewed in the United States on April 17, 2026

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