The Buell Dynamic Digital Fuel Injection (DDFI) System DDFI system features

The Buell Dynamic Digital Fuel Injection (DDFI) System provides microprocessor-based electronic engine management for the 984cc and 1203cc high performance engines. The DDFI system has the following features

Independently mapped spark and fuel control.
● Engine and air temperature compensated fuel delivery.
● Engine load measurement through throttle position.
● Single point spark delivery (no waste spark).
● Sequential port indirect (manifold) fuel injection.
● Open/Closed-loop air/fuel control.
● Automatic enrichment at start-up.
● Electric cooling fan for improved thermal management.
● Engine speed and position determined using a single
sensor (Cam Position Sensor).
● Full diagnostic capability compatible with the DIGITAL
TECHNICIAN (Part No. HD-44750-P28/Panasonic
Toughbook or Part No. HD-44750-D150/Dell Desktop).
● Returnless fuel system (excess pressure relieved in tank
byFuel Pressure Regulator Valve).
● Interactive muffler control with muffler valve position
feedback for 1203cc engines only.
The DDFI system uses six sensors to monitor the operating
conditions of the engine and make decisions as to spark and
fuel delivery. These sensors are:
● Throttle position (TP) sensor.
● Cam position (CMP) sensor.
● Engine temperature (ET) sensor.
● Intake air temperature (IAT) sensor.
● Oxygen (O2) sensor.
● Bank Angle Sensor (BAS).
The DDFI system also analyzes how the engine performs
during a ride. It then stores this information internally so it will
be available for the next ride.