FT450/550 4 Cylinder Universal A Harness


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The FuelTech FT450/FT550 4 cylinder universal harness was developed to be installed on 4 cylinder engines - up to 4 injectors and 4 smart coils. This harness has all the components needed to make a plug ’n play installation on an engine with a standard setup. The insulation and connectors are moisture, heat and oil resistant.

*FT550 also requires the B harness in order to use all extra inputs & outputs.

Technical Specifications:

  • 4 EV1 injectors
  • 4 Smart coils
  • FuelTech Peak and Hold external drivers ready
  • FuelTech WB-Nano O2 ready
  • GM style intake air temperature sensor ready
  • GM style engine temperature sensor ready
  • 2 pressure sensors ready for fuel, oil / another 0-5V sensor
  • Extra output connector for generic use
  • Crank and CAM connectors (hall and VR options included)

This harness was designed for systems with up to 4 injectors, 4 smart coils and a FuelTech Wideband Nano O2 with Bosch LSU 4.2 sensor. It's setup to run semi-sequential or multipoint injection and wasted spark. It is already wired for FuelTech Peak and Hold drivers when using 4 low impedance injectors. When using high impedance injectors, a Peak and Hold driver is not needed and in this case, only a bypass connector (jumper wires sold separately) is required. There are 3 separate relays to power the whole system, separating the injectors and coils from the electronics.

*This is only the A harness which is all the FT450 requires.
If you are using an FT550 and want to use all of the extra inputs & outputs, you will need to purchase the B expansion harness as well.