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Description
HP EFI ECU & Harness Kits - 550-605NOverview: Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine along with additional
Overview:
Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine along with additional controls for nitrous, boost or water meth.
Features:
- Optional 5.7” full-color touchscreen LCD allows easy on-the-fly tuning,data-logging or can be used as an easy to see graphical gauge panel
- Eight sequentially driven 8:2 peak and hold injector drivers, capable of driving up to 16 low or high impedance injectors as a standard feature. Multiple staged injector strategies
- Eight channel Distributorless Ignition (DIS)outputs capable of directly driving “Smart” ignition coils or Holley DIS coils. Will drive 2 wire coils with the addition of PN 554-112 high current coil driver module
- Plug and Play control of factory GM 24x and 58x LSx engines
- Integrated single channel wide band oxygen sensor control. Works with NTK sensors
- Internal data-logging standard with a huge 2GB of memory
- 4 Stage progressive nitrous control
- Turbo boost control
- Integrated water/methanol injection control
- Self-tuning fuel table strategy greatly simplifies tuning process
- Individual cylinder fuel and spark control allows you to unlock your engine’s potential
- Works with 4, 6, 8 cylinder engines
- Unique lb/hr based fueling strategy greatly simplifies and commonizes tuning
- Advanced idle, closed loop, and enrichment strategies allow for very stable operation
- ECU is fully potted and can be mounted in the engine compartment or interior
- Sealed automotive and marine grade connectors
- Allows for use of common OEM sensors as well as customer sensor calibration input
- Ignition Plug and Play with GM 24x and 58x LSx engines, GM HEI, Ford TFI, magnetic and hall effect trigger, and other ignition systems. New Plug and Play applications in process. Custom settings can be configured to allow many other applications
- 1-5 Bar MAP sensor capability
- Two channel knock control sensor Inputs for both one or two wire knock sensors
- Dedicated fuel and oil pressure inputs
- Controls both stepper and PWM Idle Air Control (IAC) motors
- Speed density, Alpha-N, or combination fueling strategies
- 4 Programmable high or low Pulse Width Modulated (PWM) outputs and 4 fully configurable inputs can be configured for use
- 4 Stage nitrous oxide control
- Fully featured nitrous control eliminates the need for a separate nitrous controller device
- Can be configured “Wet” or “Dry” with closed loop feedback
- Progressive control based on time, RPM, or boost, requires part # 554-111
- Lean or rich safety cutoff
- Full timing retard/control configurability per stage based on RPM or time
- Integrated Water/Methanol injection control
- Uses Holley Water/Meth solenoids specially designed and calibrated for use with this EFI system to allow the user to enter Water/Meth flow as a percentage of fuel injector flow
- Includes NTK Wideband Oxygen Sensor
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Emission Code | 3 |
| Ignition Type | Coil - (No Timing Control) |
| Ignition Type | Ford TFI |
| Ignition Type | GM HEI Small Cap |
| Ignition Type | Holley Dual Sync Distributor |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | EFI System |
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
4.6 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 4
They work!
They work!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 17, 2025
★★★★★ 5
Good Intro to Philosophy
Format: Paperback
There’s a lot to this book, if you haven’t read anything by Dostoyevsky before this book could be a little challenging to get into, that being said it was a very good read and a real page turner. There’s some really good stuff in there that is broken down into plain English. Some of the shorter quotes I think were beautiful especially the ones about self reliance and motivations for someone to cling onto religion.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
★★★★★ 5
Great Read!
Great book! I was recommended this by my now boyfriend and it’s a 10/10 book if you really like to think. The book itself came in perfect condition no creases or damage.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
★★★★★ 5
BEYOND GOOD AND EVIL
Format: Paperback
First and foremost: as far as this specific translation of the book goes- I didn't have too much of an issue with it. I will say that whilst reading, I noticed some of the letters were scratched.
This will not go against my opinion of the book.
At first, I was going place this book in C tier. Only because I couldn't understand it. But after finishing, I will instead put it in A tier. (For me)
To start off, I will say to be careful! Only because Neitzsche is (to my understanding) a misunderstood source.
With that out of the way, I would like to say that this book did indeed challenge what I believed about "Good" and "Bad."
How? Well, Neitzsche has an interesting view on the concept of "Good and Evil" viewing it as "Imposing your will to power onto others and the world around you"
By the fourth section, you are given various quotes. Some of those I found myself liking. One of them being: "He who fights with monsters mustn't become one. The longer you gaze into the abyss, it gazes also into you"
For me to understand what was said here, I feel as if I should look more into Neitzsche (as far as this review is concerned at the moment)
Final score: 4.5/5
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Reviewed in the United States on March 26, 2026
★★★★★ 4
Provoking philosophical work
Format: Paperback
A challenging and thought‑provoking philosophical work that explores morality, individuality, and human nature. Deep and insightful, though dense and not an easy read.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2026
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