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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
4.2 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 4
I am hopeful this new version of Pocket Hose is better built than earlier versions!
I have not had great luck with earlier versions of Pocket Hose products! I have had leaks, hose blowout holes, leaks at the facet connector and sprayer difficulty! BUT, I wanted to give the new Copper Head Hose a try. I like all the new features and feel they have made good enhancements to the hose quality! I have had the new hose for a week or so and it appears to be of better quality than previous versions. The hose is working great and I am hopeful it will last longer than the last ones. However the product is expensive and this will be my last purchase of Pocket Hose if I have ANY issues in the future. I will update my review in the future!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
★★★★★ 5
love the pockets hose!!!
Style: Ballistic, Size: 75 FT
I usually don't do reviews but the pocket hose is so great I had to . It works so well, flexible , not heavy or cumbersome to move about as it curls back to water spigot when water turned off after using!!! Fun to watch I want to throw all my other hoses out !! I am elderly and this is so light and easy for me to use. I first saw as an add on TV and was skeptical! So happy I gave it a try!! We now have2 -5oft and 1 -75 ft.
Try it you'll like it !! I promise!!
\
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
★★★★★ 5
Not as durable as advertised.
This hose is not as durable as advertised. First time I used it and didn't work. The hose itself was slit or had some other issue with the band inside because water leaked through the hose and did not reach the nozzle.
Update: I wrote to the manufacturer of the hose, Pocket Hose, regarding the defective hose. On May 30, 2026, they agreed to replace my hose under their warranty. On June 2, 2026, I received an email from them stating they recently updated their warranty policy to 30 days, and my notice was outside their 30-day warranty period. I then received an email from the seller of the hose, Bulb Head offering me a full refund on the hose. Something the manufacturer would not do. All I wanted was a replacement. I am changing my rating for the seller to 5 Stars for standing behind the sale of their product. Thank you, Bulb Head!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
★★★★★ 5
Great hose
Style: Regular, Size: 150 FT
I love these hoses. Length:I have a 50’ for the front yard and 150’ hose for the backyard. Nozzle is perfect for watering flowers, garden or great for washing the car. Flexible: Lightweight and so easy to move around. Turn off the water at the house and let it drain out the nozzle. Doesn’t take long to drain and return to original length. Durability is excellent. Connectivity is so easy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 3
Great product until it split
We bought the pocket hose 100’ copperhead expandable garden hose through Amazon from Bulbhead April 2025. We love the fact that it is light, retracts, doesn’t kink and came with a versatile nozzle. However, 13 months later, the hose split overnight, leaking an unknown amount of water to the street and eliminating water pressure in our house. Once we found the leak, we contacted the company. We were told there was a 30 day warranty and that our product was no longer covered. I’m not sure what product would break down in 30 days! I was asked if I could be compensated at all and they said no, there are discounts on the website. I will never buy this product through this company again as their customer service is lacking. Nothing was offered as a personal discount for their defective product.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
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