The FT450/550 4 Cylinder Universal A Harness gives a four-cylinder build a complete plug-and-play loom for an FT450 or FT550. It runs four injectors and four individual smart coils in semi-sequential fuel and wasted spark, with every connector labeled and insulation that resists heat, moisture and oil. It is the only harness an FT450 needs; FT550 owners add the B expansion harness for full sequential and the extra I/O.
- 4 EV1 injector outputs and 4 smart coil outputs
- Semi-sequential or multipoint injection with wasted spark
- Works with high or low impedance injectors
- Ready for FuelTech Peak & Hold external drivers
- Ready for FuelTech WB-O2 Nano with Bosch LSU 4.2 sensor
- GM-style intake air and engine temperature sensor connectors
- 2 pressure sensor inputs (fuel, oil or another 0-5V sensor)
- Crank and cam connectors with VR and Hall options
- Extra output connector for general use
- 3 relays with built-in fuses for main electronics, injectors and coils
Installation notes
Low impedance injectors need a FuelTech Peak & Hold driver. High impedance injectors only need the bypass jumper in the driver connector. To energize the coil and injector relays, output Blue #6 must be configured as Fuel Pump or RPM activation.
Related parts
Full sequential injection and the FT550's extra inputs and outputs require the FT550 4 Cylinder Universal B Expansion Harness, sold separately.
FuelTech FT450/FT550 4 cylinder universal harness manual (PDF)
