FuelTech FT550 K-Series Plug & Play Standalone Adapter

Convert OEM K-Series Harnesses to FT550 Engine Management

The VTI FuelTech FT550 K-Series Adapter is a fully prewired, plug-and-play solution designed to convert standard Honda K-Series engine harness setups to a FuelTech FT550 standalone ECU.

Built using Teflon (mil-spec style) wire and flame-resistant loom materials, this adapter is designed for reliability, motorsport durability, and clean integration.

Completely prewired and ready to install for most K-Series applications.

Designed For

• K20 & K24 engine platforms
• RSX (DC5)
• EP3 Civic Si
• K-swapped chassis running OEM-style K harnesses
• Street, drag, drift, and road race builds

Integrated Connections

This adapter provides proper breakout and routing for:

• AUX1
• AUX2
• Additional Injector Outputs (INJ expansion)
• CANBUS connection to FT550
• A & B – Main FT550 ECU connectors
• RVS – Rear Speed Sensor input

All circuits are cleanly integrated for proper FT550 functionality without unnecessary splicing or patch wiring.

Important Installation Notes

⚠ Connector Fitment Notice
When using this adapter with a stock K20 harness, one connector lock will require minor modification for proper fitment.

⚠ EP3 / RSX Main Relay Note
When installing in EP3 Civic Si or K20 RSX chassis, an additional relay must be added to properly initiate and control the main relay system.

Please verify your chassis configuration before ordering.

Construction Details

• Teflon wire construction
• Flame-resistant loom material
• Professionally terminated connectors
• Fully prewired and labeled
• Motorsport-grade assembly standards

This is not a universal patch harness — this is a structured conversion adapter built for serious standalone setups.

Included With Purchase

• Fully assembled FT550 K-Series adapter
• Basic startup FuelTech base map
• Installation notes

Optional tuning support is available upon request.
Customers may leave tuning requests in checkout notes.

Why Choose VTI?

✔ True plug-and-play integration
✔ Clean standalone conversion strategy
✔ Proper auxiliary expansion support
✔ CANBUS integration done correctly
✔ Built by experienced harness manufacturers

Need a custom FT550 configuration?
Contact us directly for advanced integration, additional outputs, or full standalone harness builds.