UltraGauge Screens
Settings
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Injector Cutoff
Settings
Vehicle Settings
Injector Cutoff
While in gear during de-acceleration, many vehicle manufacturers will turn off the fuel injectors in order to save fuel.
This is true for vehicles with either manual or automatic transmissions. The fuel savings is slight. UltraGauge can detect
when the injectors are switched off and factor the fuel savings into the fuel usage and mileage calculations.
Injector cutoff is disabled when set to zero, and is disabled by default. To enable Injector cutoff detection, set the value
equal to seven times the engine size in liters, rounded up to a whole number. For example, for a 2.3L engine the value
should be set to 2.3x7= 16.1
17. The value is not crucial and this calculation represents a best estimate.
When enabled and injector cutoff occurs, the Instantaneous MPG will read 999.9, and the Instantaneous Gallons/hour
will read 0.0
Injector Cutoff should only be seen when de-accelerating. If during heavy acceleration, Injector Cutoff falsely occurs,
decrease the injector cutoff value by 20% or until cutoff no longer occurs. Setting the value too low will cause the
Injector Cutoff to never be detected.
NOTE:
Injector cutoff detection should be enabled prior to performing fuel calibration. If enabled after
calibration, the calibration procedure should again be performed.
NOTE:
If the open/closed loop indicator is not displayed on the gauge display or the loop is always open, then the
vehicle does not support Injector Cutoff detection and this feature should remain disabled. If the loop
indicator is always open, this could indicate an issue with your vehicle. If so, check for the presence of
trouble codes.
NOTE:
Nearly all Diesel vehicles do not operate a closed loop system, and as such do not support the open/closed
loop indicator. UltraGauge does not support injector cutoff for Diesel vehicles.
NOTE:
Each vehicle manufacturer has its own algorithm for injector cutoff. Some require significant de-
acceleration, usually enabled in terms of higher RPMs and a certain speed threshold, while others have a
much lower de-acceleration requirement.
NOTE:
When the transmission is placed in neutral, the vehicle’s injector cutoff function is disabled.
NOTE:
This is an optional setting
and provides only marginal benefit to fuel usage and MPG calculations.
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Vehicle Calibration
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Vehicle Settings
Vehicle Calibration
