Holley's HP EFI ECU with an unterminated universal harness gives builders a plug-in alternative for stock or built late-model factory EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The unterminated harness lets you route and terminate wiring to fit a custom install.
Key Features:
- Unique lb/hr based fueling strategy simplifies and standardizes tuning
- Includes NTK Wideband Oxygen Sensor
- Individual cylinder fuel and spark control
- Optional 5.7" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel
- Two-channel knock control, accepting one- or two-wire knock sensors
- Internal data-logging standard with 2GB of memory
- Dedicated fuel and oil pressure inputs
- Integrated Water/Methanol injection control using Holley Water/Meth solenoids calibrated as a percentage of injector flow
- Eight sequentially driven 8:2 peak-and-hold injector drivers, capable of running up to 16 injectors with multiple staged strategies
- 8-channel Distributorless Ignition (DIS) outputs drive "Smart" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)
- 1-5 Bar MAP sensor capability
- 4 programmable PWM outputs and 4 fully configurable inputs
- Sealed automotive and marine grade connectors
- ECU is fully potted and can be mounted in the engine bay or interior
Specifications:
- Ignition Type: Coil (No Timing Control), Ford TFI, GM HEI Small Cap, or Holley Dual Sync Distributor
- Injector Connector: Jetronic/Minitimer (Bosch)
- Oxygen Sensor: NTK
- Harness Type: Unterminated Universal
- Product Type: EFI System
- Part Number: 550-605N
ECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance.
FAQ
What does "unterminated" mean for this harness?
The harness wiring isn't pre-fitted with vehicle-specific connectors, so it can be custom-routed and terminated for a wide range of applications.
Does this kit include an oxygen sensor?
Yes, it includes an NTK wideband oxygen sensor.
What ignition types does this ECU support?
Coil with no timing control, Ford TFI, GM HEI small cap, or Holley Dual Sync Distributor ignition.
How many injectors can the ECU drive?
Up to 16 low- or high-impedance injectors using eight sequentially driven 8:2 peak-and-hold drivers.
What injector connector style does it use?
Jetronic/Minitimer (Bosch) style connectors.
