______________________________________________________________________________________
Page 64/83
UltraGauge
Blue
™
User Manual www.ultra-gauge.com
E
E
f
f
f
f
i
i
c
c
i
i
e
e
n
n
c
c
y
y
G
G
a
a
u
u
g
g
e
e
s
s
Closed/Open Loop
Detection
Gauge name
Range
Units
Abbreviation
Open Loop
0 (open) to 1 (closed
Loop
The Open/Closed gauge provides an indication of the state of the vehicle’s fuel mixture control
system. Closed loop (value=1) is the desired and nominal condition, and indicates that the
vehicle’s Engine Control Unit (ECU) is using the vehicle’s Oxygen and other sensors to set the
real time fuel mixture.
An open loop (value=0) will normally occur when the vehicle is cold, or when the throttle is
wide open, or when the engine is being used to decelerate the vehicle. If the loop remains open,
this indicates that there is a problem with the overall fuel mixture system and the ECU is no
longer able to determine the correct fuel mixture. In this situation the ECU uses a static table to
approximate the fuel mixture. In this state the fuel mixture will likely be too rich or too lean.
Continued open loop operation will likely result in a Trouble code. This gauge is not present on
most Diesels.
Instantaneous
Fuel/Hour
Gauge name
Range
Units
Abbreviation
Inst Fuel Hour
0 to 99.99
G/H
Inst
0 to 99.99
L/H
Provides the real time measure of the rate of fuel consumption per hour.
Volumetric
Efficiency (MAP
vehicles only)
Gauge name
Range
Units
Abbreviation
VE
(MAP vehicles only)
0 to 100
%
Volumetric Eff
Volumetric efficiency is a measure of how fully your vehicle can fill its cylinders with the
fuel/air mixture on the intake stroke. For example, a vehicle with a VE of 50% is able to fill its
cylinder with 50% of it potential. UltraGauge uses several engine sensors to determine the VE
dynamically. This Gauge is only shown if the MAP sensor is present.
If Adaptive Volumetric Efficiency has been enabled, this gauge will provide the Volumetric
Efficiency percentage in real time.
Adaptive Volumetric Efficiency can be controlled via the menu system by selecting:
To determine if your vehicle uses a MAP sensor, access the Vehicle Information screen;
from the Gauge screen
This will display
MPG sensor:
MAP
,
MAF
or
None
Instantaneous Fuel
Efficiency
MPG-KPL-L/100k
Gauge name
Range
Units
Abbreviation
Instantaneous Fuel Efficiency
0 to 235
MPG
Inst
0 to 100
KPL
Inst L/100km
0 to 999.9
LPK
Inst LPK
Instantaneous Fuel Economy
