Short Term Fuel Trim
Enables immediate correction of fuel delivery based on AFR readings. The ECU compares the actual AFR (from the wideband sensor) to the target AFR and applies quick corrections to injector pulse width.
Long Term Fuel Trim
Allows the ECU to “learn” over time and apply persistent corrections for consistent AFR deviations.
Barometric Compensation
When enabled, the ECU adjusts fueling based on changes in atmospheric pressure (altitude). This keeps the AFR consistent in different elevations or weather conditions.
Injection Angle
Displays the current end of injection angle,if you click on Table, you will find a Table that can be adjusted to Tune the current injector ''end of injection'' angle (in degrees of crankshaft rotation). This can be optimized for better fuel atomization and combustion efficiency.The angle is before compression stroke starts.
AFR Sensor Distance from Cylinder Head
Adjusts for the physical delay between combustion and the AFR sensor’s reading due to exhaust pipe length. A longer distance means slower feedback, which can affect correction stability.
Learn Button
Enables the automatic learning function that will run a proprietary algorithm to calculate the distance between the exhaust ports and the wideband sensor, you might have to run this more than once with the engine runing at a stable RPM to get an accurate value.
Correction Range
Defines the operational AFR window within which closed-loop corrections are active. Outside of this range, corrections are disabled for safety or performance.
Adaptation
Enables the ''Autotune'' (please see adaptation table here on the wiki).
Flood Clear
Sets the throttle position (as a percentage) above which fuel is cut entirely during engine cranking. Used to clear flooded engines by holding the throttle wide open.
Engine Displacement
The total swept volume of all engine cylinders, in cubic centimeters (cc). This is critical for calculating base fuel requirements.
Injector Flow Rate
Specifies how much fuel a single injector flows per minute at standard pressure (cc/min). Must match your hardware for accurate fueling.
Number of Injectors
Total number of fuel injectors the ECU is controlling. Used in the base fuel calculation.
Max Duty Cycle
Defines the maximum allowed injector open time as a percentage of engine cycle. Prevents overdriving injectors and ensures safe operation.
Fuel Type
Select the fuel type used (e.g., Gasoline). Some calculations may differ based on stoichiometric AFR for the fuel.
Staged Injection
Enables or disables control of a secondary set of injectors. Used in high-power setups where primary injectors can't supply enough fuel at higher loads.
Settings (Disabled)
This button becomes active when staged injection is enabled, allowing configuration of staging conditions.
Calculate Button
Automatically calculates the base injector pulse width required for fueling based on all the values provided.
Required Fuel (Output)
Displays the resulting fuel pulse width (in milliseconds) calculated for the given engine and injector setup, this would in theory be the injector opening time in miliseconds for 100% VE.
Running Sequential (Read Only)
Indicates if the ECU is operating in sequential injection mode. This cannot be changed from this screen.
These options allow the tuner to selectively disable certain fuel compensation strategies for testing or tuning:
Coolant
Disables coolant temperature-based fuel enrichment. Normally used to add extra fuel when the engine is cold.
Air Temperature
Disables compensation based on intake air temperature, which normally adjusts for air density changes.
After Start Enrichment
Disables the extra fuel added immediately after starting the engine to improve cold starts.
Acceleration
Disables acceleration enrichment, which is temporary fuel added when the throttle is rapidly opened to prevent hesitation.