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Description
Holley Terminator X MAX Engine Management Systems 550-926TERMINATOR X MAX MPFI W TRANS & DBW, LS1 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, LS1
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 550-926 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 LS1/LS6 engines with 24x crank reluctor with EV1 injectors and 4L60E/4L80E transmissions, and drive-by wire throttle body control.
- 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 - 4L60E/4L80E Transmission Control Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted
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, Transmission |
| Part Number | 550-926 |
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4.1 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Outstanding! An absolute must for college students
Format: Paperback
I picked this book up hoping it would prepare me for the job market, which I was already pretty confident about. It was incredibly eye opening, and enlightened me about dozens of things I was overlooking--like using Facebook as my "professional friend" and getting a linkedin account. It was a little stressful seeing how much I could do, but I've been working through the tips one at a time and its really built momentum in my professional brand even as an undergraduate. Now, I have something to do to build my career everyday.
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Reviewed in the United States on February 24, 2012
★★★★★ 5
Most liked
Format: Hardcover
Great book
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Made Me Examine My Own Hidden Prisons -- Powerful and Empowering
Format: Hardcover
I was fortunate to read Shaka's book early, and it stands as one of the most profound self-help books I've ever encountered. The experience reminded me of reading MAN'S SEARCH FOR MEANING -- that rare combination of beautiful, raw writing paired with hard-earned wisdom born from lived experience.
What sets HOW TO BE FREE apart are the "Digging Deeper" sections at the end of each chapter, which offer straightforward, specific guidance for breaking free from the hidden prisons that keep us from reaching our potential. These aren't vague platitudes; they're practical tools you can actually use.
While my privileged upbringing couldn't be more different from the experiences Shaka writes about, I quickly discovered that the hidden prisons he explores -- grief, anger, struggles with forgiveness and vulnerability, etc -- are universal. They affect all of us, regardless of our background or circumstances. As someone who loves introspection, I found myself genuinely engaged in examining my own hidden prisons and what holds me back. The book doesn't just tell you about these barriers -- it makes you want to dig into your own.
What his journey gave me wasn't just insight, but confidence. If he could find his version of freedom from solitary confinement, then I have no excuse not to pursue mine.
The writing itself is incredible -- authentic, compelling, and beautifully crafted. I'd read anything Shaka wrote. This book doesn't just teach you about freedom; it shows you the path to find your own.
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Reviewed in the United States on September 11, 2025
★★★★★ 5
Feeling Stuck in Self-Doubt or Fear? This Book Unlocks the Hidden Prisons Holding You Back!
Format: Hardcover
That’s exactly where I was—stuck in what Shaka calls “Hidden Prisons.” Reading How to Be Free felt like someone handed me the key I didn’t know I already had. This isn’t just another “self-help” book filled with fluffy affirmations. Shaka earned his wisdom the hard way—19 years behind bars, 7 of them in solitary confinement. And yet, out of that darkness, he forged a blueprint for freedom that applies to EVERYONE: CEOs, parents, students, athletes… anyone who’s tired of being stuck.
What I loved most? The book doesn’t just inspire—it gives you tools you can actually use. Daily practices like journaling, mindfulness, and meditation aren’t presented as clichés but as lifelines. I tried just one of the exercises and immediately noticed a shift in my mindset.
🔥 My biggest takeaways:
Your setbacks can fuel your greatest comebacks.
Vulnerability isn’t weakness—it’s power.
Protecting your peace is just as important as chasing success.
True freedom starts in the mind, long before circumstances change.
If you’ve ever battled shame, anger, or the feeling that life is slipping through your fingers—this book is the wake-up call you need. By the time you finish How to Be Free, you won’t just believe change is possible—you’ll have a clear path to living it.
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Reviewed in the United States on September 12, 2025
★★★★★ 5
Profoundly powerful.
Format: Audiobook
I found this book incredibly powerful. A clear, courageous guide to living unbound. An invitation to drop inherited scripts based on adopted norms - think of guilt, grind, respectability - and instead find a path to peace, integrity, and self-trust. I'm a big fan of The Artist’s Way, which helped me unlock creative flow, and How to be Free channels that same liberating energy into life as a whole: how we love, work, heal, and show up every day. It includes simple rituals, helpful reflection prompts, and mindset shifts that make room for full, authentic expression. I already have a long list of friends to give this to.
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Reviewed in the United States on September 12, 2025