AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 408)

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© 2014 AEM Performance Electronics
Infinity User Manual
Tile
Software feature allowing multiple windows to be displayed at once
Torque
Torque is a measure of an engine's ability to do work. Engine torque is normally measured with
an engine dynamometer.
Trims
Alternate term used to describe correction tables in an engine calibration file
TXD
Abbreviation for Transmit Data
uS
Abbreviation for microsecond or one ten thousandth of a second or 0.0001 seconds
USB
Universal Serial Bus (USB) is a serial bus standard to connect devices to a computer. Other
convenient features include providing power to low-consumption devices, eliminating the need
for an external power supply, and allowing many devices to be used without requiring
manufacturer-specific device drivers to be installed.
Vacuum
Vacuum is measured in units of pressure. In automotive technology, vacuum is often measured
using inches of mercury on the barometric scale or as a percentage of atmospheric pressure in
bars or atmospheres. Low vacuum is often measured in inches of mercury (inHg) below
atmospheric pressure. "Below atmospheric" means that the absolute pressure is equal to the
current atmospheric pressure (e.g., 29.92 inHg) minus the vacuum pressure in the same units.
Thus a vacuum of 26 inHg is equivalent to an absolute pressure of 4 inHg (29.92 inHg - 26 inHg).
The reciprocating motion of the pistons in an internal combustion engine create a vacuum in the
manifold.
Volumetric Efficiency
The intake system on a spark ignited engine, restricts the amount of air that an engine of a given
displacement can flow. The parameter used to measure the effectiveness of an engine's
induction process is the volumetric efficiency. It is defined as the volume flow rate of air into the
intake system divided by the rate at which volume is displaced by the piston.
Wasted Spark
A wasted spark is when in an ignition system in a four-stroke cycle internal combustion engine
spark plugs fire in pairs, on both the exhaust and compression strokes. The extra spark on the
exhaust stroke has no effect and is thus "wasted." This design is simpler than a conventional
ignition system, but the extra sparks reduce the lifespan of components (contact breaker, spark
plugs).
XY Plot
In data analysis, a plot of one variable versus another rather than time