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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
HP EFI ECU & Harness Kits - 550-601Overview: Looking for a plug and play alternative for your stock or built late model factory 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
Overview:
Looking for a plug and play alternative for your stock or built late model factory 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:
NEW V2 SOFTWARE FEATURES - “Quick Start” ignition and fueling strategy for LS x Engines
- Data Logger. Scalable axes, Smoothing, Multiple graph view ability, Pre-defined notes fields and many more
- Strip Chart Real-Time Data Viewer
- Integrated Boost Control - Boost vs Time, Boost vs Gear (Time or RPM), Boost vs RPM, Boost vs Speed, Launch control. Boost launch builder, Over-boost safeties, Boost scramble
- Traction Control - Power reduction via timing, nitrous percentage or boost (Requires Davis Technologies Holley Module)
- “Quick Start” fueling for all engines
- Option for VE based fueling strategy
- Fuel Map and Learn Function Smoothing
- Configurable User Password Protection
- Fully Configurable lap top Gauge Panel
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 tuning precision unmatched in the industry
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Emission Code | 3 |
| Ignition Type | Coil - (No Timing Control) |
| Ignition Type | GM HEI Small Cap |
| Ignition Type | Holley Dual Sync Distributor |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
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 1311 reviews
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Product Reviews
★★★★★ 5
Dreamy Hockey Men & Steamy Romance
Format: Audiobook
Loved this book! This book came up as one of my Amazon similars. As for contemporary, they must have an intriguing plot to hold my interest. I normally prefer Paranormal, Dystopian or Sci-fi romance or romantic suspense.
The blurb sounded appealing, so I decided to give it a chance. This was my first hockey romance. After reading this book, I'm now a fan of the genre. This story had everything in it that I loved. An intense, slow-built romance. A cocky guy, who didn't really do relationships until he meets the girl who brings him to his knees. Friends to lovers with a few games in between. Spicy love scenes and jealous. Most importantly, a driving plot with intense drama that had the perfect balance. But it wasn't childish or over the top.
I was over the moon when I recently learned that this book is becoming an adaptation for on Amazon. May 13th can't come fast enough.
This book was so good, I decided to check out book #3 in the series, The Score. All 4 books in the Spin off series blurbs sounded interesting. After book #3, I immediately read all the books in the spin-off. Book #1, The Deal is tied with The Play in the spin-off series as my favorite with The Risk in the spin-off being a close 2nd..
Another thing I like about her series is that they all the books are stand-alones. You can also read the books out of order. Each book is a separate couple, so you get a new story each time, alongside following the other characters that were introduced in previous books
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Reviewed in the United States on May 19, 2026
★★★★★ 5
The deal
Format: Kindle
What a great story. I love the characters, the way its fun and sexy while dealing with serious issues, too. So so good! Read it in a day!
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Reviewed in the United States on May 22, 2026
★★★★★ 4
Not forced or rushed
Format: Hardcover
I really liked this book. Hannah & Garrett’s story starts off like a typical smart girl tutors the jock to help him get though a class in college. But their stories are traumatic and the things that they have both had to overcome make this book so much more than your typical tutor/jock story. Garrett is sweet, cocky, funny and helps bring Hannah out of her shell in a refreshing way. Hannah is not meek or mild or quiet, she is strong because of her past but still a little unsure. Together their chemistry is hot and their relationship just sort of naturally unfolds. I really loved that it didn’t seem forced or rushed, it just happened as it should. Garrett’s story in particular hit very close for me so maybe that is why I felt connected to these characters so much. I am really looking forward to reading the rest of the series.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Accurate
Color: Stainless Steel, Size: Medium Size
Just place it on the counter, press the power button, and you’re ready to weigh ingredients instantly. The digital display is clear and easy to read, and switching between grams and ounces is fast and intuitive which makes it great whether I’m following recipes or tracking portions for meal planning.
The weighing platform is spacious enough to fit bowls, plates, or containers and the scale is impressively accurate even with small amounts like spices or coffee grounds. I’ve used it for baking precise measurements, prepping meal portions for a keto plan, and tracking food for weight‑loss goals, and it performs consistently every time.
It also has useful features like a tare function which lets you subtract the weight of your container so you only measure what matters. The scale feels sturdy and well‑made yet still lightweight and easy to store when not in use.
Overall this Etekcity food scale is a fantastic value and a must‑have for anyone serious about cooking, baking, or healthy living. I’ll definitely be using it for years and would buy it again without hesitation.
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Reviewed in the United States on March 3, 2026
★★★★★ 5
Great Kitchen Purchase
Color: Stainless Steel, Size: Medium Size, Color: Stainless Steel, Size: Medium Size
I didn’t realize how much I needed a kitchen scale until I got this. It’s really accurate and makes cooking (especially baking) so much easier and more consistent.
The tare function is a game changer—you can zero out the bowl and keep adding ingredients without extra measuring cups. It’s also easy to switch between grams and ounces, which is great for following different recipes. Most digital scales measure very precisely, often down to about 1 gram, which makes a big difference for accuracy.
It’s compact, easy to clean, and doesn’t take up much space on the counter. Overall, such a simple tool but makes a big difference—definitely worth having in any kitchen.
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Reviewed in the United States on April 8, 2026