Holley's HP EFI ECU and harness kit is a plug-in alternative for stock or built late-model factory Ford EFI engines, and also serves as a direct replacement for an aging Holley C950 ECU. The HP ECU accurately manages fuel and ignition while adding control for nitrous, boost, or water/meth injection.
Key Features:
- Unique lb/hr based fueling strategy simplifies and standardizes tuning
- 4-stage nitrous oxide control with fully featured nitrous management, eliminating the need for a separate controller
- Integrated single-channel wideband oxygen sensor control, compatible with NTK or Bosch sensors
- Individual cylinder fuel and spark control
- Wet or Dry nitrous configuration with closed-loop feedback
- Integrated Water/Methanol injection control using Holley Water/Meth solenoids calibrated as a percentage of injector flow
- ECU is fully potted and can be mounted in the engine bay or interior
- 8-channel Distributorless Ignition (DIS) outputs drive "Smart" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)
- Includes NTK wideband oxygen sensor
- 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
- 4 programmable PWM outputs and 4 fully configurable inputs
- 1-5 Bar MAP sensor capability
- Internal data-logging standard with 2GB of memory
- Plug and Play ignition compatibility with GM 24x/58x LSx, GM HEI, Ford TFI, magnetic, and hall-effect triggers
Specifications:
- Ignition Type: Coil (No Timing Control), Ford TFI, or Holley Dual Sync Distributor
- Injector Connector: Jetronic/Minitimer (Bosch)
- Oxygen Sensor: NTK
- Includes: HP EFI ECU, universal Ford V8 MPFI harness, Ford V8 injector harness, NTK oxygen sensor
- Product Type: HP EFI Kit
- Part Number: 550-606N
ECU is certified to ISO 8846, SAE J1171, and United States Coast Guard requirements for ignition protection and fire resistance. Free software and firmware updates are available for download.
FAQ
What's included in the Holley 550-606N kit?
The HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and an NTK oxygen sensor.
What ignition types does this ECU support?
Coil with no timing control, Ford TFI, or Holley Dual Sync Distributor ignition.
Can it control nitrous or boost?
Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water/meth injection, and more.
What injector connector style does it use?
Jetronic/Minitimer (Bosch) style connectors.
Is a handheld or laptop tuning device required?
An optional 5.7" full-color touchscreen LCD is available for on-the-fly tuning and data logging.
What certifications does the ECU carry?
It's certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance.
