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Page 26/63 UltraGauge™ EM User Manual www.ultra-gauge.com
Boost pressure is the positive pressure inside the intake manifold relative to atmospheric pressure. Unlike Boost Pressure
below, this gauge only shows positive values greater than Atmospheric pressure. If this gauge reports “err” or “0”, then your
vehicle does not actually support this gauge.
Boost Pressure2
Gauge name Range Units Abbreviation
Boost Pressure PSI
Boost Pressure kPa
-14.60 to 22.50
-101 to 155
PSI
kPa
Bst2 PSI
Bst2 kPa
Boost pressure is the pressure inside the intake manifold relative to atmospheric pressure. It is also commonly known as
Manifold Gauge Pressure. For vehicles which also support the Barometric gauge, Boost pressure is relative to the barometric
pressure. For vehicles not supporting a barometric gauge, the ambient barometric pressure is considered to be constant @ 14.64
PSI or 101 kPa.
Maximum Boost is limited by the OBDII standard and not by UltraGauge. The limit for most vehicles is 22.5 PSI or 155 kPa.
Boost Pressure is only supported if the vehicle has an Intake Manifold Absolute Pressure sensor also known as a MAP sensor,
and the value of this sensor is made available via the OBDII.. If the “Intake Pres abs” gauge is not present in the list of
discovered gauges, then the Boost Pressure gauges will also be absent.
Exhaust
Pressure
Gauge name Range Units Abbreviation
Barometric PSI 0 to 95 PSI EXH PSI
Barometric kPa 0 to 655 kPa EXH kPa
Exhaust Pressure. Supported by few vehicles (<1.35%), this gauge is typically only found on
Diesel vehicles.
Charge Air
Cooler
Temperature
Gauge name Range Units Abbreviation
Charge Air Temp ºF
-40 to 419.9
ºF
CRG ºF
Charge Air Temp ºC
-40 to 215
ºC
CRG ºC
The Charge Air Cooler is used to cool air after it has passed through a turbocharger. This
gauge measures the temperature of the air after being cooled by the Charge Air Cooler. Most
commonly found on Diesel vehicles.
Boost Pressure
Gauge name Range Units Abbreviation
Boost Pressure2 PSI
Boost Pressure2 kPa
0 to 297
0 to 2048
PSI
kPa
Bst PSI
Bst kPa
Mass Air Flow 2
Gauge name Range Units Abbreviation
Mass Air Flow 2 g/s 0-999.9 grams/second MA2 g/s
Mass Air Flow (MAF) is the Mass of Air entering into the engine. Vehicles with physical MAF sensors will have
two gauges; this gauge and Mass Air Flow 1. Mass Air Flow 1 is the raw output from the MAF sensor, whereas
Mass Air Flow 2 is the calibrated or true MAF used by UltraGauge to calculate MPG. MAF 2 is derived from
either the MAF sensor or calculated by UltraGauge. MAF 2 is calculated for vehicles that do not have a MAF
sensor but rather use a MAP (manifold absolute pressure) sensor or Fuel Rate from the ECU. The Source of MAF
2 is affected by the “Force MPG sensor” setting.
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