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EDELBROCK E-TUNER DISPLAY DEFINITIONS:
Vacuum: When a piston moves down the cylinder bore, it creates a vacuum. The average amount
of vacuum from all cylinders is measured in the intake manifold. Using atmospheric pressure as a
zero baseline, manifold pressure is expressed as a negative value -XX Vacuum. The E-Tuner app
displays engine load in terms of inches of Mercury Vacuum. A displayed value of -10.0 means the
engine is creating 10.0 inches of vacuum. A value of 0.0 should be expected for most applications
under full throttle conditions or when sitting stationary with no RPM. Expected vacuum values for
idle can vary depending on camshaft configurations.
Race Camshaft at idle: -8.0 to -11.0
Mild Camshaft at idle: -10 to -16.0
Stock Camshaft at idle -15.0 to -20.0
RPM (Revolutions Per Minute): Refers to how "fast" an engine's Crankshaft is rotating. The Pro-
Flo 3 EFI System calculates the RPM (Tach) Signal from the distributor sensor.
Coolant Temperature: This sensor is typically mounted in the coolant passage of the intake
manifold on the hot side of the coolant thermostat. Many functions of the ECU rely on the Coolant
Temperature as an indicator of how warm or cold the engine is. Fuel trims and Idle Control
functions rely on Coolant Temperature sensor feedback to calculate fuel trims to improve cold start
functions. Typical values should be between 170°F - 210°F.
Battery Voltage: This measures the power input being supplied to the ECU from the Battery. It is
important to make sure the vehicle's battery is well charged and maintains a steady voltage above
12V at all times. Fluctuating battery voltage can result in poor engine performance and is usually
caused by bad grounds, bad battery or alternator. Typical values should be between 12.5 - 14.0 V.
Throttle (TPS): The Throttle indicates a percentage of how much the Throttle Blades are open
inside the Throttle Body. The TPS (Throttle Position Sensor) is what measures the actual throttle
rotation, and is reported from 0 – 100%. For all Pro-Flo 3 applications, the Throttle at Idle must
be calibrated to 10%.
Idle Air Control Percent (IAC %): The IAC% will indicate how much the Idle Air Control valve is
being used to maintain your Idle Speed. The IAC% should be used as a tool for properly adjusting
the Idle Screw to set the base Idle Speed for installations using a Pro-Flo 4150 intake manifold with
a PWM IAC motor. The Idle Screws should be adjusted so the IAC%.
Intake Air Temperature (IAT): This is the temperature of the air as it passes through the throttle
body. IAT's can also give a good estimate of the under the hood temperature.
Fuel Pressure Sensor: Fuel Pressure is an important part of any EFI system, as any unsteadiness
or "bouncy" fuel pressures can affect performance. A drop in fuel pressure during hard acceleration
may indicate a fuel supply issue. Typical values should be between 58 - 62 psi.
ECU Temperature: This monitors the temperature of the ECU box with a sensor placed on the
ECU board. While not as critical as the other temperature readings, please be mindful of how hot
the ECU gets. The Bluetooth module may start having connectivity issues at temperatures above
130°F.
AFR (Air Fuel Ratios): AFR defines the ratio of the amount of air consumed by the engine
compared to the amount of fuel. Larger values are considered "Lean" because there is more air
than fuel in the mixture. Lower values are considered "Richer" because the mixture has more fuel
than air. Depending on the performance level of the engine Air Fuel Ratios from 12.5 to 14.5 could
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