Holley 550-601 HP EFI ECU & Harness Kits

GM TPI and Holley Stealth Ram™, Includes Bosch Oxygen Sensor

Part Number: 550-601

Looking for a plug and play alternative for your stock or built late model factory 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

• Lean or rich safety cutoff
• FEATURES
• “Quick Start” ignition and fueling strategy for LS x Engines
• Integrated Water/Methanol injection control
• Controls both stepper and PWM Idle Air Control (IAC) motors
• 4 Programmable high or low Pulse Width Modulated (PWM) outputs and 4 fully configurable inputs can be configured for use
• Works with 4, 6, 8 cylinder engines
• Fully Configurable lap top Gauge Panel
• 4 Stage progressive nitrous control
• Two channel knock control sensor Inputs for both one or two wire knock sensors
• 4 Stage nitrous oxide control
• Fully featured nitrous control eliminates the need for a separate nitrous controller device
• Integrated Boost Control - Boost vs Time, Boost vs Gear (Time or RPM), Boost vs RPM, Boost vs Speed, Launch control. Boost launch builder, Over-boost safeties, Boost scramble
• Turbo boost control
• Sealed automotive and marine grade connectors
• Configurable User Password Protection
• Custom settings can be configured to allow many other applications
• Traction Control - Power reduction via timing, nitrous percentage or boost (Requires Davis Technologies Holley Module)
• Full timing retard/control configurability per stage based on RPM or time
• NEW V2 SOFTWARE FEATURES
• “Quick Start” fueling for all engines
• Individual cylinder fuel and spark control allows you to unlock your engine’s potential
• Unique lb/hr based fueling strategy greatly simplifies and commonizes tuning
• Can be configured “Wet” or “Dry” with closed loop feedback
• Dedicated fuel and oil pressure inputs
• Advanced idle, closed loop, and enrichment strategies allow for very stable operation
• 1-5 Bar MAP sensor capability
• Strip Chart Real-Time Data Viewer
• Fuel Map and Learn Function Smoothing
• Internal data-logging standard with a huge 2GB of memory
• 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
• Speed density, Alpha-N, or combination fueling strategies
• 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 for Water/Meth tuning precision unmatched in the industry
• Data Logger. Scalable axes, Smoothing, Multiple graph view ability, Pre-defined notes fields and many more
• Progressive control based on time, RPM, or boost, requires part # 554-111
• Option for VE based fueling strategy
• Plug and Play control of factory GM 24x and 58x LSx engines
• 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.
• ECU is fully potted and can be mounted in the engine compartment or interior
• Self-tuning fuel table strategy greatly simplifies tuning process
• 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
• 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
• Integrated single channel wide band oxygen sensor control. Works with NTK or Bosch sensors
• Allows for use of common OEM sensors as well as customer sensor calibration input

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. ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. Software and firmware updates can be downloaded here for free