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Description
Holley Terminator X Engine Management Systems 550-903TERMINATOR X MPFI, LS1 Take control of your LS engine with Terminator X! 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 features real time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The
TERMINATOR X MPFI, LS1
Take control of your LS engine with Terminator X! 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 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. Terminator X 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 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.
- 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.
- 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
- 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
- Includes: 24x LS Engine Main Harness - EV1 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Application
- 1998 - 2002 Chevrolet Camaro
- 1997 - 2004 Chevrolet Corvette
- 1998 - 2002 Pontiac Firebird
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | Terminator X LS MPFI |
| Terminator LS Options | Fuel, Spark |
| Part Number | 550-903 |
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
4.8 ★★★★★
Based on 1767 reviews
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Product Reviews
★★★★★ 5
One of the best Bat stories that I've read.
Format: Paperback
Coming off from The Long Halloween, Jeff Loeb and Tim Sale give us the sequel to their popular story tale in which we see Batman go at it with another year long mystery, while also giving us an origin story for the first Robin, Dick Grayson. After reading this book, I have come away having with even more love of the Dark Knight's mythology, while coming to see this as my favorite Batman story that I have read, even if it doesn't stand as well on its own.
ON the narrative side of things, Loeb delivers a story fairly similar to the one he gave in The Long Halloween, though I feel this one is a bit more polished than Halloween was. Some have said that the retreading of plot structure have limited the way Loeb's later works are read, but I myself have no problem with it (for the most part), Loeb manages to do enough differently that you don't feel like you're reading the exact same story. The real big negative I'd have to give this graphic novel is that it really doesn't stand as well by itself than if you had read The Long Halloween. While I myself read that story before coming in to this one, I did see many connections that I would assume would through off any newcomers who hadn't read the prior story. But I will say that this is the story that had me invested the most emotionally. Without giving away any spoilers, that last page in the novel gave me such a cathartic experience that I really came to appreciate certain aspects of the Dark Knight's mythology, and how themes of loneliness were touched upon in a very genuine way.
Looking at the art for the novel, Sale's work has improved much from The Long Halloween. I always mention in reviews concerning Sale that I was originally not a fan of his art, but after going through his work, you can't help but admire the level skill he manages to put in his drawings. There is a very big noir feeling in this novel (a plus for ) that is just delivered so well that any preferences in art I may have against Sale are put away in admiring the way he plays with lighting in the story. My biggest complaint for the art, which is a more of a personal thing really, is that I do not like the "pixie" costume they gave Robin (which is his default costume that many would associate him with). I have never really liked this costume, probably never will, but again, this is just me.
Overall, I would say I really enjoyed the novel and would have to recommend it to any fans of the Batman (although I'd make sure you have read The Long Halloween first). This has come to be one of my most favorited Batman stories I've read, and I hope others will receive the same level of satisfaction that I have.
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Reviewed in the United States on April 22, 2014
★★★★★ 5
MUST READ
Format: Kindle
Best Batman! This and the long Halloween are peak! Listening and reading the dc high vol on spotify is amazing
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Reviewed in the United States on October 16, 2025
★★★★★ 4
Good sequel but not as good as the original.
Format: Paperback
Pretty good read only down side is it doesn’t quite live up to Long Halloween.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Great Sequel to Long Halloween
Format: Paperback
This takes all of the great elements of the Long Halloween and keeps it going. The two of those books together is a great story telling. Ticks all the boxes of a great Batman book. If you like this and Long Halloween check out The Penguin show on HBO Max. and if you like The Penguin but haven't read these two books you should since the show pulls a lot of influence from them.
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Reviewed in the United States on November 22, 2024
★★★★★ 5
Worth the price!
Format: Paperback
Great set!
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Reviewed in the United States on November 8, 2025