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:
- Eight sequentially driven 8:2 peak-and-hold injector drivers, capable of running up to 16 low- or high-impedance injectors with multiple staged injector strategies
- Plug and Play control of factory GM 24x and 58x LSx engines
- Controls both stepper and PWM Idle Air Control (IAC) motors
- Individual cylinder fuel and spark control
- Internal data-logging standard with 2GB of memory
- 4-stage nitrous oxide control, expandable to 4-stage progressive nitrous
- Dedicated fuel and oil pressure inputs
- Two-channel knock control, accepting one- or two-wire knock sensors
- 8-channel Distributorless Ignition (DIS) outputs drive "Smart" ignition coils or Holley DIS coils directly (2-wire coils require PN 554-112)
- Optional 5.7" full-color touchscreen LCD for on-the-fly tuning, data-logging, or as a graphical gauge panel
- Unique lb/hr based fueling strategy simplifies and standardizes tuning
- Integrated single-channel wideband oxygen sensor control, compatible with NTK or Bosch sensors
- 1-5 Bar MAP sensor capability
- Integrated Water/Methanol injection control using Holley Water/Meth solenoids calibrated as a percentage of injector flow
- Sealed automotive and marine grade connectors
Specifications:
- Ignition Type: Coil (No Timing Control), Ford TFI, or Holley Dual Sync Distributor
- Injector Connector: Jetronic/Minitimer (Bosch)
- Oxygen Sensor: Bosch
- Includes: HP EFI ECU, universal Ford V8 MPFI harness, Ford V8 injector harness, Bosch oxygen sensor
- Product Type: HP EFI Kit
- Part Number: 550-606
If utilizing the Ford OEM TPS and IAC sensors, a Ford connector (not supplied) must be wired in. ECU is certified to ISO 8846, SAE J1171, and USCG requirements for ignition protection and fire resistance. Free software and firmware updates are available for download.
FAQ
What's included in the Holley 550-606 kit?
The HP EFI ECU, a universal Ford V8 multi-point fuel injection harness, Ford V8 injector harness, and a Bosch oxygen sensor.
Do I need extra parts to use factory Ford TPS and IAC sensors?
Yes, if using the Ford OEM TPS and IAC sensors, you'll need to wire in a Ford connector, which is not supplied.
Can it control nitrous or boost?
Yes, its 4 programmable inputs and outputs support boost control, progressive nitrous, water/meth injection, and more.
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.
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.
