Pay in installments of $262.49 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 17 - Jul 22
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Holley High Performance EFI ECU 554-113HOLLEY EFI HP ECU 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
HOLLEY EFI HP ECU
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 V4 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 tubing
Application
- Universal
Specs
| Brand | Holley EFI |
|---|---|
| Coast Guard Approved | Yes |
| Emission Code | 3 |
| Product Type | HP ECU- ECM |
| Part Number | 554-113 |
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
4.9 ★★★★★
Based on 10 reviews
Sort
Product Reviews
★★★★★ 3
Decent
Color: Black, Size: X-Large
Smells strange, assuming its the dye. Good fit, although the arms are quite long. Also had some strange stitch going across the left breast area that seemed like a mistake and was an eye sore. Good value overall for a quick put together suit.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 9, 2025
★★★★★ 5
perfect fit, excellent quality
Color: Navy Blue, Size: XX-Large
Fit perfect true to size great quality loved it on my husband
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
★★★★★ 5
Nice Suit For The Price
This suit was a time-saver! My wife ordered a tux that wasn't going to make it for a formal occasion, so this was ordered and came within three days. It was a good thing she purchased 2, in case of sizing errors. The extra large pants worked, but sizing down to the large jacket & vest made the best combination/fit. We didn't go with the blue/black bow tie & flower it came with, but may for another event. However, being able to work interchangeably at a low price was rewarding!!
Thought to add comments that the look of this suit is pleasing (though it's not the best thread). The workmanship gives it a 5 and even greater. The compliments were many. I do suggest using a good steam iron that will eliminate the wrinkles, without creating unwanted creases, while barely touching the suit; but, definitely follow the creases in the pants leg.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2025
★★★★★ 5
Disappointed
Size: XX-Large, Color: Light Grey, Size: XX-Large, Color: Light Grey
Overview of the Purchase Experience
I recently ordered a 3-piece suit for my significant other, who is quite tall at 6’8”. I was excited about this purchase, hoping it would be a stylish addition to his wardrobe. However, upon receiving the suit, I encountered several issues that I feel compelled to share.
Color Discrepancy
One of the most disappointing aspects of this order was the color inconsistency. The suit was supposed to be a cohesive set, but it arrived with two different colors. This mismatch not only detracted from the overall aesthetic but also made it difficult to wear as a complete outfit. When purchasing a suit, especially a three-piece one that includes trousers, a vest, and a jacket, one expects all pieces to match in color and style. Unfortunately, this was not the case here.
Quality Concerns
In addition to the color issues, I found the quality of the fabric and construction to be subpar. The material felt cheap and did not have the durability or elegance one would expect from a suit. The stitching appeared uneven in places, and there were loose threads that raised concerns about its longevity. A well-made suit should exude quality and craftsmanship; however, this product fell short on both counts.
Fit Issues Related to Height
Given my significant other’s height (6’8”), finding suits that fit well can be challenging. While I cannot recall his exact weight at this moment, it’s important to note that tall individuals often require tailored fits or specific sizing options that accommodate their stature. Unfortunately, even if the colors had matched and the quality had been better, I doubt this suit would have fit him properly without additional alterations.
Conclusion
Overall, my experience with this 3-piece suit has been disappointing due to color discrepancies and poor quality construction. For anyone considering purchasing this item for someone tall or for themselves, I would recommend looking elsewhere unless you are prepared for potential issues with fit and appearance.
Peggy Cole FabFashiion not approved
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 24, 2024
★★★★★ 5
Excellent Affordable Suit for Special Occasions
Size: Large, Color: Black, Size: Large, Color: Black
Bought this for prom and was very happy with how it looked. The jacket is a nice medium weight and looked great on. We ordered a large, which was slightly big, but after having the suit tailored it fit perfectly. My son received many compliments and looked amazing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026