Holley 550-605N HP EFI ECU & Harness Kits

Unterminated Universal Harness, Includes NTK Oxygen Sensor

Part Number: 550-605N

Looking for a alternative for your stock or built late model factory FORD 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 and Benefits

• 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
• Individual cylinder fuel and spark control allows you to unlock your engine’s potential
• 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
• ECU is fully potted and can be mounted in the engine compartment or interior
• Sealed automotive and marine grade connectors
• Includes NTK Wideband Oxygen Sensor
• Unique lb/hr based fueling strategy greatly simplifies and commonizes tuning
• Two channel knock control sensor Inputs for both one or two wire knock sensors
• Full timing retard/control configurability per stage based on RPM or time
• Internal data-logging standard with a huge 2GB of memory
• Speed density, Alpha-N, or combination fueling strategies
• Dedicated fuel and oil pressure inputs
• Progressive control based on time, RPM, or boost, requires part # 554-111
• Can be configured “Wet” or “Dry” with closed loop feedback
• 4 Programmable high or low Pulse Width Modulated (PWM) outputs and 4 fully configurable inputs can be configured for use
• 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
• Self-tuning fuel table strategy greatly simplifies tuning process
• Fully featured nitrous control eliminates the need for a separate nitrous controller device
• 1-5 Bar MAP sensor capability
• Turbo boost control
• Advanced idle, closed loop, and enrichment strategies allow for very stable operation
• 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.
• Allows for use of common OEM sensors as well as customer sensor calibration input
• 4 Stage progressive nitrous control
• 4 Stage nitrous oxide control
• Integrated water/methanol injection control
• Works with 4, 6, 8 cylinder engines
• Custom settings can be configured to allow many other applications
• Integrated single channel wide band oxygen sensor control. Works with NTK sensors
• Controls both stepper and PWM Idle Air Control (IAC) motors
• Lean or rich safety cutoff
• Plug and Play control of factory GM 24x and 58x LSx engines

ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard inputs and various other uses. When selecting an ECU, users need to ensure their planned controls can be run with the 4 inputs and 4 outputs as certain combinations may use more I/Os than are available. If more I/Os are required, users should choose the Dominator VMS.