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Description
Holley Terminator X MAX Engine Management Systems 550-927TERMINATOR X MAX MPFI W TRANS & 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
TERMINATOR X MAX MPFI W/TRANS & 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 550-927 also has 4L60E or 4L80E Transmission control and 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 LS 4.8/5.3/6.0 Truck Engines with 24x crank reluctor, Transmission Control, Drive-by Wire throttle body 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-Board Diagnostic LEDS for: ECU Power – Engine Run – Wideband Status – TPS Calibration – Crank Signal –Cam Signal. Allow you to identify any Critical engine issues a
- 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
- Recommended Pedal part number - 10379038
- Includes: 24x LS Engine Main Harness - Multec 2 Injector Harness - DBW Throttle Body Harness - 4L60E/4L80E Transmission Control Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and ass
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | Multec 2 |
| Product Type | Terminator X Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Drive-by-Wire, Transmission |
| Part Number | 550-927 |
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
4.4 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Mini monster
Color: Mint
Its a little mini that does big work, and this ting really is mini lol. But it has done shirts for me wonderfully all sizes, with no issues or complaints. For the price it is amazing
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Reviewed in the United States on March 25, 2026
★★★★★ 4
Great for small to medium heat transfer projects.
Color: Lavender Purple, Color: Lavender Purple
This is perfect for small heat transfer projects. I used a few ready to press designs and it worked pretty well. It is small, portable, lightweight, and has a few heat settings on it. If you are looking to use it for sublimination, it is not the right fit. Tried sublimination and while there was enough heat to transfer some of the image, because of the size, it is really hard to get even, exact pressure over the entire project area which results in uneven, spotty results.
All in all, great for small to medium heat transfer projects, and perfect for someone just getting in to heat transfer.
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Reviewed in the United States on April 28, 2026
★★★★★ 5
HTVRONT is the competition
Color: Mint
I've never purchased an HTVRONT product that I didn't like. I really like this mini heatpress. It's perfect for pressing small pieces for quilting, or a piece of vynil when a larger press is too much. I like the color and design but more importantly, it heats as it should with no glitches. I have another mini press from a different leading brand and comparitively, this one is the better of the two. I caught it on sale but at regular price I would have still bought it.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Just As Good As Cricut- Half the Cost
Color: Pink, Color: Pink
I had a Cricut mini press, but my mother loved it for her quilting so much that I had given it to her.
I learned after that it was a mistake as I used it more than I had realized. When looking back at the price, I could not justify almost $40, so I waited. I have been a user of HTVRONT's other products for years, so I finally gave it a chance.
The package came with the mini press neatly resting in a fine quality box, where it is easy to store. It feels sturdy and well made without any weird smells. It has a nice weight to it, but not too heavy. It evenly distributed heat making it easy to apply the HTV onto my project. I was able to easily use it on felt and cotton.
I actually prefer it has a dial for temperatures rather than buttons like the cricut.
10/10 would recommend.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
High Recommend!!!
Color: Mint
This mini heat press packs a lot of heat! It’s very easy to use and it’s light weight. I use it for my crochet projects when ironing patches on. The silicon holder didn’t burn when resting the mini machine on it either. This is a pretty sturdy mini press and I am very happy with my purchase.
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Reviewed in the United States on June 5, 2026