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Description
Holley Terminator X MAX Engine Management Systems 550-931TERMINATOR X MAX MPFI W DBW 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
TERMINATOR X MAX MPFI W/DBW
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 550-931 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:
- Designed for GM 4.8/5.3/6.0 LS Truck Engines and LS2/LS3 with 58x Crank, 4x Cam and a Drive-By-Wire Throttle Body, with EV6 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.
- 4 Outputs – Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
- 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake
- 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: 58x/4x LS Engine Main Harness - EV6 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 | 58x |
| Emission Code | 3 |
| Ignition Type | GM LS 58x |
| Injector Connector | USCAR (EV6) |
| Product Type | Terminator X Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Drive-by-Wire |
| Part Number | 550-931 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.5 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
Useful but not perfect
Color: silver
Useful, but typing with laptop perched on it is unsteady. I use a separate keyboard.
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Reviewed in the United States on April 2, 2026
★★★★★ 5
Why are people trying to type on a laptop stand?
Color: silver
So the overwhelmingly negative reviews you'll notice for this product specifically surround the "bounciness" of this stand when someone is typing on it—however what is confusing to me is how people are purchasing a laptop stand in theory to optimize their ergonomics, yet also stretching their arms out and elevating them to type on said laptop once it's raised. the point of a laptop riser/stand is to elevate the screen so that you can maintain a more natural posture. One would assume you have an external keyboard to use in conjunction with your laptop once you place it on a RISER, because the idea is to elevate your laptop as a SCREEN and then have a level/flat surface to type on, thereby alleviating any awkward hunching or neck strain looking down or anywhere not naturally eye-level.
as it is, it's a perfectly functional and elegant laptop riser. I don't find myself wanting to adjust the height often if ever, but in the one or two instances I experimented with it, found no mechanical issues. It looks nice with Apple hardware and allows me to have my laptop's screen flush with the bottom edge of my additional external monitor, so it serves my purposes well.
for people complaining about how it bounces when they type on it ... STOP typing on your laptop's keyboard when you have it elevated on a riser! this defeats the purpose and probably also makes your arms tired—buy an external keyboard!
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Reviewed in the United States on December 2, 2020
★★★★★ 5
Nice Valet tray with Qi standard charger USB-C
Color: Best Dad-brown
I like this valet tray. I'm not fond of the message in the main compartment of the valet tray. It means they expect someone to buy it for their dad. I bought it for myself. What I like is the Qi standard compatibility of the wireless charger. It has many advantages over the wireless chargers that are sold. Most are round circles, so your phone teeters on the odd design. Some want to attach to my phone with some magnetic gimmickry. This valet tray takes a different approach. It has a built-in Qi standard wireless charger that's in a rectangular compartment. The USB-C wire that is USB-C at both ends is faster; that's the advantage of USB-C. It carries more power and higher data speed. But the Qi standard disables charging when the phone is at 100%. This avoids overcharging. It's an excellent design. The charging port is built-in to the side of the valet tray. Just the placement of the indicator light is under the phone. A fully charged phone doesn't trigger charging. It avoids overcharging. There is drawback the shallow USB port doesn't allow proper seating of USB C plugs this puts a lot of weight on a barely plugged wire.
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Reviewed in the United States on September 19, 2025
★★★★★ 5
Very Nice!
Color: Best Dad-brown, Color: Best Dad-brown
I must admit I was a little suprised at how nicely done this Valet Tray has been made. My father used to have one similar to this when I was a child (without the charging base) that came from Italy. It was made from real leather and he had it for many years. This Valet Tray reminds me of his. I realize it is not real leather but it is definitely an excellent grade of PU. The seams are Immaculate, with razor straight stiching. Not a single thread out of place. The Vege Leather is truly beautiful, with realistic and natural looking coloration and shading as real leather would have. The feel is the same as well oiled and polished leather. Honestly I am impressed with how much time and effort has been put into this Valet Tray. This is an excellent Gift for anyone who has a busy life and likes to know where their keys are etc.. As well as being an excellent place to set your phone. The charging tray works perfectly. The user manual that comes with this Valet Tray gives all the information needed. It is very simple and easy to set up. You simply plug in the cord that is included with the tray and when you set your phone down on the charging pad, Bingo! it begins to charge. You can tell when it is charging because the light will turn from blue (standby) to green (charging). I must say that I am extremely happy in every way with this Valet Tray. The different Sayings that these come with are very nicely done. This one says "Dad, Your'e My Hero, Thanks for Everything" There are other sayings as well by this company, as for this one I am looking forward to giving this one to my husband on Fathers Day (from our son) and see the happiness on his face. I would recommend this to anyone with a "Dad" in their life who could use one.
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Reviewed in the United States on January 19, 2025
★★★★★ 4
★★★★ Practical and Stylish Gift for Dad
Color: Best Dad-brown
This valet tray is a fantastic gift idea for dads! The design is excellent, offering a functional and organized space for essentials like keys, wallets, and phones, with ample storage for other belongings. The built-in wireless charger is a thoughtful touch, though upgrading it to MagSafe or Qi2 compatibility would make it even better for modern devices.
The quality feels premium, with high-quality vegan leather that’s both durable and easy to clean, making the price feel justified. It’s also the perfect size for a desk, nightstand, or dresser. While the tray is marketed for dads, I’d love to see variations for women, children, or other demographics—it’s such a versatile and practical product.
The only other thing I’d like is more color options to match different styles or decor. Overall, it’s a thoughtful and well-made gift that’s both stylish and functional!
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Reviewed in the United States on December 8, 2024