6.7.3 Fuel Setup (Alt 3)
6.7.3.1 Fuel Configuration
Start enrichment – Set a value in milliseconds here for start enrichment. This enrichment is
added to the calculated fuel when the engine is started. It will then be phased out in a certain
RPM’s.
Max Fueling – Set a value in milliseconds here for the max amount of fuel allowed to your engine
during running. This value is calculated as the time it takes for 2 crank revolutions at maximum
RPM. The example is an engine doing 6500 RPM max. For Two-stroke engines this value will be
half.
Start Prime Pulse – This setting in milliseconds is the initial fuel that will be squirted in the engine
to ease starting. It is only injected once the engine is cranked and not when the ignition is switched
on. Half of this value will be squirted every time the fuel pedal is pressed more than 25%. This
feature is handy on very cold days for starting.
Fuel Cut-off - This feature will cut the fuel supply when the engine is running against
compression. This is useful in town and downhill driving and will save fuel. It will also prevent
flaming in the exhaust during accelerator blip. Fuel Cut-off will only be activated when both of the
following criteria are met. There is a dead band feature built into these settings to prevent jerking
when cruising close to the parameters.
Fuel Cut-off Vac –The MAP sensor value must be less than this setting.
Fuel Cut-off RPM –The engine RPM must be more than this setting.
The TPS value has no affect on this function.
Fuel Cut-off TPS – This setting is used for the idle control. The ECU will not control the idle motor
if the TPS value is not below this value. It would however raise the RPM whenever the engine
RPM falls below the set point under idle control.
Fuel Calculation – This setting is to allow the tuner to choose Map sensor calculation or Throttle
sensor calculation. Map sensor is the preferred one as it is a direct representative of the air intake
and load of the engine. It can also compensate for sea level differences. It is also the easiest way
to tune the engine. TPS sensor on the other hand is used when performance cams are used for
racing or if the engine has separate throttle bodies and no mean engine vacuum chamber. Here
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