Fast 30400-KIT-EZ-EF Instructions Manual - page 58
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Idle Adv
Degrees of ignition timing added or subtracted by the ECU (if enabled) to influence
idle speed. This makes up one part of the final timing value the engine sees.
Base Timing + Idle Adv + Vacuum Adv = Total Timing
Timing‐related data is only valid when EZ‐EFI® is controlling timing.
Inj DC %
Injector duty cycle. This is a comparison of how long the injectors are open compared
to how much total time is available for them to be open. At higher RPM, there is less
time between injector openings. If this reaches 100%, it means the injectors
physically cannot flow any more fuel. They are already being held wide open.
Lb/Hr
Current total fuel flow rate into the engine. Given in pounds per hour. This can be
used to get a rough approximation of current engine power.
Horsepower = Fuel Flow (lbs/hr) x 2
Load
Calculated Load. A comparison of the current manifold pressure vs. the ambient
atmospheric pressure. Unlike the reading from the MAP sensor – which is affected by
altitude – Load should always be consistent. That is, wide open throttle should always
be around 100% regardless of altitude and ambient atmospheric pressure.
MAP
Manifold Absolute Pressure. This is a measure of the load on the engine. It is
displayed in kPa (kilopascals). Its range is from 0 kPa (a perfect vacuum) to 105 kPa.
With the engine off, this will read around 100 kPa. It will drop down when the engine
is started.
O2 Cor %
Current closed‐loop correction based on the reading from the wideband oxygen (O2)
sensor. This is the percent of fuel being added (displays as a positive number) or
removed (displays as a negative number) to achieve the target air/fuel ratio. As the
ECU learns more and more, this will tend to get smaller and smaller in steady state
driving.
RPM
Engine speed
Target AFR
Target Air/Fuel Ratio. The ratio the ECU is working to maintain. This is determined by
engine load and the settings on the AFR Targets screen found on the Advanced menu.
Total Timing
The final timing value the engine sees. A timing light should agree with this value. It
is made up of several different values.
Base Timing + Idle Adv + Vacuum Adv = Total Timing
Timing‐related data is only valid when EZ‐EFI® is controlling timing.
TPS %
Throttle Position Sensor. This tells you how far the throttle blades are open. The
Setup Wizard takes care of calibrating this sensor. It can easily be verified using this
display. If you ever notice the TPS reading is not 0 at idle, it should be re‐calibrated.
This can be done by selecting TPS Calibration from the Advanced menu.
TPS Volts
The current signal voltage being returned from the throttle position sensor to the
ECU. It should sweep smoothly from a lower value to a higher value as the throttle is
opened. The ECU uses this value to determine TPS %.
Vacuum Adv
Degrees of ignition timing added based on manifold vacuum (if enabled). This makes
up one part of the final timing value the engine sees.
Base Timing + Idle Adv + Vacuum Adv = Total Timing
Timing‐related data is only valid when EZ‐EFI® is controlling timing.