Note: These settings are only used when the Fuel Equation Mode is set to Traditional
Master Fuel
Master Fuel scales the overall fuel injection scheduling and is effective throughout the entire operating range from idle to full power. Master Fuel is required as an overall trim to account for the size/capacity of the engine and the flow rate of the injectors.
Note: Master Fuel should be adjusted before adjusting the cells in the Fuel Table.
The value of Master Fuel is the injector pulse width (in milliseconds) that results if the active cell of the of the Fuel Table is set to a value of 100 and the manifold absolute pressure is 100kPa. This does not include any other enrichments or corrections. Increasing the Master Fuel value increases the injector pulse width and hence the amount of fuel injected into the engine. However, changing Master Fuel DOES NOT change any value in the Fuel Table or any other fuel adjustments. It is therefore possible to achieve the same tune with a smaller Master Fuel and larger Fuel Table numbers as when using a larger Master Fuel and smaller Fuel Table numbers.
Note: It is recommended to use a Master Fuel value which results in the rows in the middle of the Fuel Table having cell number values around 50 with the desired air/fuel ratios.
The Master Fuel Trim is a percentage correction applied to the Master Fuel pulse width.
Example:
Master Fuel Pulse Width = 9ms,
Master Fuel Trim Percentage = 4%
To calculate the effective pulse width:
Effective Master Fuel = Master Fuel + (Master Fuel * (Master Fuel Trim / 100))
= 9 + (9 * (4/100))
= 9 + 0.36
= 9.36
The effective master fuel is 9.36ms.