Enrichment:
A software parameter that adds injector pulse width (typically as a percentage) to the values
defined by the raw fuel curve.
Fuel Pressure Regulator:
A device that regulates the fuel rail (and thus the fuel injector) pressure. Generally
equipped with a vacuum port referenced to manifold vacuum/boost to adjust fuel pressure on a 1-to-1 basis with
manifold pressure. For examples, a regulator will increase fuel pressure by 1psi for every psi increase in
manifold pressure.
Gamma:
See TFPW. This number is no longer used with
TECgt
systems.
General Purpose Inputs (GPI):
Input channels that the
TECgt
can use to process data from sensors that are
not related to the core engine management sensors. Switches and vehicle speed sensors can be run to the GPIs.
General Purpose Outputs (GPO):
Output channels from the
TECgt
that can be used to trigger external
devices such as thermo fans, torque converters, etc.
Horsepower (HP):
A measurement of the rate at which an engine can perform work. One HP = 550 lb-ft per
second.
Idle Air Control (IAC) Motor:
A device that is used to meter air into an engine at idle. Air from the outside
of the intake manifold is regulated into the intake plenum by the IAC motor.
Ignition Timing:
The amount of degrees before Top Dead Center that a spark plug fires.
IOT/POT:
Injector Offset Time. (a.k.a. Pulse-width offset time) This number adds or subtracts a fixed pulse
width from the raw fuel curve. The value of IOT/POT is the amount of time (in milliseconds) that will be added
or subtracted.
Knock Sensor:
A device used to measure detonation.
Knocking:
see ‘Detonation’
Lean Mixture:
An air-fuel mixture that carries less fuel than the stoichiometric air-fuel ratio.
Load:
The amount of work that an engine must provide at a given instant. Load is measured by using the MAP
sensor to estimate the cylinder pressure on
TECgt
systems. Higher loads result in higher MAP readings.
Manifold Air Pressure (MAP) Sensor:
A device that measures the absolute pressure of the intake charge for
an engine.
Manifold Air Temperature Enrichment:
An inlet air temperature-based enrichment that is used to add fuel
when the incoming air is cold, and therefore denser than usual.
Manifold Air Temperature (MAT) Sensor:
A device that measures the temperature of the incoming air
charge for an engine.
Millisecond (ms):
A length of time equal to one one-thousandth of a second.
1 millisecond = 0.001 second
Mixture:
A term used to describe the air and fuel entering the engine as a single entity.
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TECgt Manual Version 2.0
- Page 130 -
©2008 Electromotive, Inc.
