Built for 1999-2004 Ford Modular 4-valve engines, this HP EFI ECU and harness kit is a complete plug-and-play solution that accurately controls fuel and ignition, with headroom for wild cam profiles and power adders.
Key Features:
- Designed specifically for 1999-2004 Ford Modular 4-valve engines
- Plug and play with factory sensors — crank, cam, TPS, coolant temp, and more
- Plug and play with factory actuators — coils, injectors, IAC
- Connectors included for Holley fuel pressure and oil pressure sensors
- Connectors for expanded inputs and outputs
- Complete kit includes HP ECU, NTK oxygen sensor, MAP sensor, coil drivers, and all necessary harnesses
- NTK oxygen sensor recommended for leaded or methanol fuels, high-exhaust and forced-induction applications, or highest-precision feedback
- 4 programmable inputs and 4 programmable outputs for boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard, and more
- Free software and firmware updates available for download
Specifications:
- Engine: Ford Modular Motor
- Ignition Type: 4V Ford Modular
- Injector Connector: Jetronic / Minitimer (Bosch)
- Product Type: HP EFI Kit
- What's Included: HP ECU, NTK O2 sensor, MAP sensor, coil drivers, harnesses
- Part Number: 550-617N
This kit's 4 inputs and 4 outputs suit most vehicles running a single power adder. If your build needs more I/O than that — multiple power adders or a more complex control scheme — step up to a Dominator VMS-based kit instead.
FAQ
What engine is this HP EFI kit designed for?
It's built specifically for 1999-2004 Ford Modular 4-valve engines.
What's included in this kit?
The complete plug-and-play kit includes the HP ECU, an NTK oxygen sensor, a MAP sensor, coil drivers, and all necessary harnesses.
How many programmable inputs and outputs does the HP ECU have?
It has 4 programmable inputs and 4 programmable outputs, suitable for controls like boost, progressive nitrous, water/meth injection, and fuel pump control.
What if my build needs more than 4 inputs and 4 outputs?
If your combination requires more I/O than this kit provides, Holley recommends stepping up to a Dominator VMS-based system.
Why is the NTK oxygen sensor recommended?
It's recommended for leaded or methanol fuels, high-exhaust and forced-induction applications, or anywhere the highest-precision feedback is needed.
What part number is this kit?
This HP EFI ECU and harness kit is Holley part number 550-617N.
