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Description
Holley HP EFI ECU and Harness Kits 550-606FORD MPFI HP ECU AND HARNESS KIT 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
FORD MPFI HP ECU AND HARNESS KIT
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 or Bosch 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 for Water/Meth tu
Application
-
Universal
Specs
| Brand | Holley EFI |
|---|---|
| Emission Code | 3 |
| Ignition Type | Coil - (No Timing Control) |
| Ford TFI | |
| Holley Dual Sync Distributor | |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
| Part Number | 550-606 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Product Reviews
★★★★★ 5
Great content, horrible formatting
Format: Kindle, Format: Kindle
I am only a quarter way through the book and can see it is excellent in terms of content - the kind of book that makes the reader quite angry at the way things have been done behind the scenes (much like Patel's "Government Gangsters" and "Kennnedy's "The Real Anthony Fauci").
However, a warning to those who get the Kindle version - it is formatted horribly. After having read dozens of books on my iPad mini using the Kindle app over the years, this is the first bok where hyphens are in words that do not break on line endings, which seems minor but after a few dozen instances gets really annoying. I hope some AI reads these reviews and sends a note to whoever edited this thing (or converted it to an e-book) to rectify this stupid situation.
Attached are two screen shots, both from page 39 - where I high-lit the offending words...
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Reviewed in the United States on February 17, 2026
★★★★★ 5
I have never said this before, but a MUST read.
Format: Paperback
A terrifying book. If you have been following recent random statements from the President about election fraud and our actions against Venezuela, things will become much clearer. It is a scary read and will bring feelings of dread, but it should be read by everyone. By several copies and hand them out to anyone you know. The world has been played.
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Reviewed in the United States on December 18, 2025
★★★★★ 5
Election fraud in America and 72 other countries documented
Format: Paperback
Powerful book on election fraud that should be read by every American and 72 other countries that had their elections also fixed.
I salute award-winning author Ralph Pezzullo's courage and determination.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 9, 2026
★★★★★ 5
Proof that our election systems have been corrupted!
Format: Paperback
This is the book that Election Corruption Deniers don't want you to read. It is well documented and it brings the receipts. I admire the tenacity and sacrifice of those who made this book possible. If you are at all concerned about election integrity, you need to buy this book.
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Reviewed in the United States on March 12, 2026
★★★★★ 4
Crucial information
Format: Paperback
Provides crucial information about election fraud, but badly in need of a competent editor.
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Reviewed in the United States on February 25, 2026