Req Fuel
Calculate the base fuel multiplier for the engine. This value is calculated using the following formula :

Req_fuel = 6.49 * (D / N / I)
D: engine displacement (cc)
N: number of primary injectors
I: injector flowrate (cc/min)

This formula applies to gasoline, this value needs to be increased to run with fuels that have lower air fuel ratios. Typically 30-40% higher with E85, and more than double with methanol.

Injector Flow Rate
This is used solely to calculate fuel consumption if a wheel speed sensor is connected.

Number Of Cylinders
Total number of cylinders.

Two/Four Stroke
The system supports two or four stroke engines,

Injection Type
Most common is port injected using one injector per cylinder.

Engine Type
Most common is Even Fire where all cylinders fire evenly divided over time in one engine cycle.

MAP (Load) Multiplication
This is enabled for all engines that use Speed-Density (RPM/MAP) for it's fuel calculation. For Alpha-N (RPM/TPS) please check the Alpha-N/Speed-Density dialog.

MAT Dependant Retard
Enables or disables the MAT/TPS ignition retard table

Barometric Pressure Correction
When the ECU starts up the MAP sensor is sampled once, and stores this value for barometric correction. You can set how much deviation from 100 kPa (atmospheric pressure) is acceptable, if the bounds are exceeded then 100 kPa will be used.