Looking for a plug-and-play alternative for a stock or built late-model factory EFI engine, or a replacement for an older Holley C950 ECU? This HP EFI ECU and harness kit is built for universal V8 multi-point fuel injection applications, adding accurate fuel and ignition control plus optional nitrous, boost, or water/meth control.
Key Features:
- Certified to ISO 8846, SAE J1171, and U.S. Coast Guard requirements for ignition protection and fire resistance
- Advanced idle, closed-loop, and enrichment strategies for stable operation
- Ignition plug-and-play with GM HEI, Ford TFI, magnetic and hall-effect trigger, and other ignition systems
- Two-channel knock control sensor inputs for one or two-wire knock sensors
- Integrated single-channel wideband oxygen sensor control, works with NTK or Bosch sensors
- Eight sequentially driven 8:2 peak-and-hold injector drivers, supporting up to 16 low or high impedance injectors
- Eight-channel Distributorless Ignition (DIS) outputs
- 4 programmable PWM outputs and 4 fully configurable inputs
- 1-5 Bar MAP sensor capability
- Internal data logging with 2GB of memory
- Turbo boost control and 4-stage progressive nitrous control
- Integrated water/methanol injection control
- Self-tuning fuel table strategy, speed density, Alpha-N, or combination fueling strategies
Specifications:
- Application: Universal V8 multi-point fuel injection
- Ignition Type: Coil (no timing control), Ford TFI, GM HEI small cap, or Holley Dual Sync distributor
- Injector Connector: Jetronic/Minitimer (Bosch type)
- Inputs/Outputs: 4 programmable inputs, 4 programmable outputs
- MAP Sensor: 1-5 Bar
- Oxygen Sensor: NTK
- What's Included: ECU, harness, communication cable, software, NTK wideband O2 sensor
- Part Number: 550-604N
If more than 4 inputs and 4 outputs are needed for the planned combination of controls, Holley recommends stepping up to the Dominator VMS.
FAQ
What applications is the 550-604N designed for?
It's built for universal V8 multi-point fuel injection conversions, as a plug-and-play alternative to factory EFI or a replacement for an older Holley C950 ECU.
What ignition types does this ECU support?
Coil with no timing control, Ford TFI, GM HEI small cap, and Holley Dual Sync distributor ignition types.
Does it support boost and nitrous control?
Yes, it includes turbo boost control and 4-stage progressive nitrous control, plus integrated water/methanol injection control.
What's included in the kit?
The ECU, harness, communication cable, software, and an NTK wideband oxygen sensor.
Can I data-log with this ECU?
Yes, it includes internal data logging with 2GB of memory.
