Fueltec FT 500 - 20.3 Deceleration cut-off; 20.4 Revolution limiter

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20.3 Deceleration cut-off
This function cuts-off fuel every time the throttle is not being pressed
and the engine is above the chosen RPM. It results in a great gain of economy,
because fuel is not wasted when the car is let run with gears engaged, when
engine break is being used, or when the driver steps off the gas to make turns
or in regular transit situations. When situations like the ones mentioned above
are considered altogether, the deceleration fuel cut-off provides a valuable
reduction of fuel consumption.
Another benefit in using this function is keeping the engine of a circuit
actuated in order to make a turn, it is necessary that it has a quick and clean response from the engine as soon as it
starts picking up speed again at the end of the turn. In endurance races, the economy is another very important factor.
A standard RPM of 2000rpm is recommended. Setting a very low RPM may cause the engine to turn off
involuntarily during deceleration. On the opposite case, when setting a very high RPM, there will not be significant fuel
economy gains.
- delay before fuel is actually cut-off after
releasing the throttle. Such delay exists to avoid the engine to instantly become lean when the throttle is released. It also
rapidly cools the combustion chamber without being excessive, and avoids situations in which the cut-off might oscillate,
especially when the throttle is lightly pressed. A standard delay of 0.5s is suggested.
20.4 Revolution limiter
This function is very important for engine protection, limiting the RPM
with three different options of cut-off:
Ignition: the engine ignition is cut-off when the configured RPM is
reached. It is recommended for high-power engines, especially turbocharged
ones, being the most efficient and safe option.
Fuel Injection: the fuel injection is cut-off instantly, as the ignition is
still operating. It is a very smooth and clean cut-off. Recommended only for
naturally aspirated engines, it is the standard setting in vehicles with original
injection systems.
20.5 Shift alert
indicating that gear must be shifted.
Even so, it is possible to set the Shift Light RPM on the screen.