UltraGauge Screens
Settings
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VE Enable (MAP only)
Settings
Vehicle Settings
VE Enable
Enable Adaptive Volumetric Efficiency. Vehicles use either a Manifold Absolute Pressure (MAP) sensor or a Mass Air
Flow (MAF) sensor to determine fuel mixture* Mileage calculations with MAF are much more accurate than with
MAP. One issue with MAP is that it is necessary to know the volumetric efficiency (VE) of the engine. Volumetric
efficiency (VE) is the measure of the ability to fully fill the cylinders with the fuel/air mixture. VE is different for each
engine design. An engine with a 50% VE is one that is able to fill to 50% of capacity on the intake stroke.
Normally when Adaptive VE is not enabled, the VE is automatically set to a fixed average. With Adaptive VE enabled,
the VE is automatically adjusted dynamically based upon run time conditions to more accurately determine mileage.
For MAP vehicles, the VE can be monitored through the VE gauge. This feature should remain disabled for vehicles
that are supercharged or turbo-charged. If enabled, also set the RPM at which the engine achieves peak torque. See
VE RPM for additional details. The VE% gauge is visible only when a MAP sensor is present in the vehicle.
If enabled, it will then be necessary to run the MPG calibration to achieve best accuracy. For most vehicles Adaptive
Volumetric Efficiency will provide improved accuracy of the MPG, Fuel Level, TTE and DTE gauges. In rare cases
the adaptive VE may result in less accurate results, in which case it should be disabled.
*To determine if your vehicle uses a MAP or a MAF sensor, access the Vehicle Information screen;
. This will display MPG sensor: MAP, MAF or None
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VE RPM (MAP only)
Settings
Vehicle Settings
VE RPM
When Adaptive Volumetric Efficiency is enabled, VE RPM is used to fine-tune VE for your vehicle. Input the RPM at
which your vehicle’s torque peaks. Typically presented in the form XXX ft-lbs @ RPM, this parameter is commonly
specified for most engines and can be found on automotive sites such as vehix.com. Search for your specific vehicle
and then find the engine specifications section.
By default this value is set to 4400 RPMs. This value is ignored for MAF vehicles and when Adaptive Volumetric
Efficiency is disabled. VE may be monitored through the VE gauge. This gauge is only visible for vehicles with MAP
sensors.
If after calibration, it is found that the MPG results are still not accurate enough, the VE RPM value can be further
adjusted. If UltraGauge reports less fuel used than actual, reduce the VE RPM by 200 and repeat Calibration. Likewise,
if UltraGauge reports more fuel used than actual, increase the VE RPM by 200. The value is arbitrary and
experimentation is necessary.
