Edelbrock Pro-Tuner, User Manual

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Pressure Ratio (PR): Ratio of Engine manifold pressure to barometric
(ambient) pressure.
An example would be 50kPa of manifold absolute pressure
(MAP) and a barometric pressure of 100 kPa would result in a
PR of 0.50
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Rev Limit (Hard) RPM at which both ignition and fuel are totally cut off
Rev Limit (Med) RPM at which ignition cut off pattern is more aggressive than
in the "soft" pattern to try to limit RPM
Rev Limit (Soft) RPM at which ignition and fuel are cut off in a "soft" pattern to
limit RPM
RPM Revolutions Per Minute: number of crankshaft revolutions per
minute
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Semi-Sequential
Injection Two (or more) cylinder's injectors are triggered at the same
time during the engine's cycle. (batch fire). Typically this
provides more control over the injection event for cylinders and
results in better midrange torque than bank firing injectors.
Sequential Injection With a cam sensor or other method of determining and
synchronizing with cylinder #1 intake cycle, each injector can
be fired sequentially at the precise time needed for each
cylinder (independent of other cylinders). This allows for
customizing the injection event for each cylinder.
Sequential Spark With a cam sensor or other method of determining and
synchronizing with cylinder #1, each spark plug can be fired
sequentially at the precise time needed for each cylinder
(independent of other cylinders). This allows for customizing
the ignition event for each cylinder, or pair of cylinders in a
waste spark Coil Near Plug system.
Serial Serial Data: Method of connection to a laptop or PC that
involves transmitting and receiving data in a serial method.
SOI Start of Injection : The point that the injection event begins in
relation to crankshaft position of that cylinder.
Spark Advance In degrees, how far before Top Dead Center the spark plug
fires.
Speed Density A method of calculating the inducted mass airflow of an
internal-combustion engine-based MAP RPM, and mapped
volumetric efficiency at a constant temperature. Self
compensates for variation in environment.
Stoichiometric The theoretical air/fuel ratio for perfect combustion; it enables
exactly all of the fuel to burn using exactly all of the oxygen in
the air. This will be 14.7:1 Air Fuel Ratio for gasoline.
Supercharger A mechanically driven air pump (usually from the crankshaft
with belts or gears) used to force more air into the cylinders.
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