FT500 SFI / FT500LITE SFI
57
Fuel tables adjust
Acceleration enrichment is a fuel increase when the throttle is suddenly
opened.
Max fuel on pump:
value added to the actual injection time when a
quick throttle variation is detected. There are two RPM and injection
time parameters to be set. With them, the FT500 / FT500LITE creates
an acceleration fuel table that interpolates the values between these
two positions.
TPS/MAP variation for maximum fuel pump shot: This configures the
MAP or TPS variation for which the max fuel pump will be used. Engines
equipped with small throttles usually need a higher TPS variation
to need max fuel pump. In this case, use higher TPS values on this
parameter (70-90%). For big diameter throttle bodies, a small TPS
variation is enough to demand max fuel pump (around 15%). The
TPS or MAP selection is done in the Engine Setup menu. If the TPS is
not present, MAP must be choosed.
Accel fuel pump reduction above TPS 50%:
due to reduced need
of fuel when the acceleration fuel pump occurs with the throttle already
opened above 50%, this parameter reduces the max fuel pump on
this condition. By standard, the ECU reduces 50% of the max pump
when it occurs above 50% of TPS.
Cold engine fuel pump enrichment:
this is a simple increase on
the max fuel pump value when the engine is cold, extremely needed
on the first minutes of engine operation.
Fuel decay on max pump: this is the injection time that will be
subtracted from the actual injection time during a sudden throttle
closure. With this, in a fast throttle closing, is possible to remove fuel
and have a more stable AFR during deceleration.
17.7 Engine temperature compensation
Engine temp compensation
-20 °C
15
%
This compensation is applied based on the engine temperature sensor,
which, in water-cooled cars, must be at the cylinder head reading the
water temperature, and in air-cooled engines, must be reading the
oil temperature.
Compensations based on engine temperature are only available when
the sensor is connected to the injection system.
Intake Air Temp. compensation
-20 °C
-27
%
This compensation is applied based on the air temperature sensor
placed in the intake manifold, and it is only available when the sensor
is connected to the injection system.
This compensation mode is used to automatically adapt the injection to
different temperatures of the air taken by the engine. In turbocharged
engines, it is of great importance, because when the system is
pressurized, the temperature rises immediately to very high numbers.
17.9 Battery votlage compensation
Battery voltage fuel compensation
8,0 V
Bank A
Bank B
2,345
ms
0 000
,
ms
With lower battery voltages the injectors takes a longer time to open
and to close. This table is used to compensate this variation.
Fuel injectors with a high flow rate usually operate with minimum
injection time at idle speed and are the ones most affected by a
battery voltage drop.
17.8 Intake air temperature compensation
