Proper fuel enrichment during cold starts and warm-up is critical to ensure smooth engine operation, prevent stalling, and optimize combustion when coolant temperatures are below operating levels. This menu allows fine-tuning of AFR enrichments and fuel trims based on temperature, engine cycles, and RPM/load.
Purpose: Adjusts the target Air-Fuel Ratio (AFR) during warm-up based on coolant temperature. This enrichment makes the mixture richer (lower AFR) to compensate for fuel condensation and poor vaporization when the engine is cold.
Actual Value Display:
Temperature: Displays the current coolant temperature (e.g., 61.6 °C).
Compensation: Shows the current AFR offset being applied based on the table above, this will impact on the target AFR table for the specific Coolant temperatures you want to compensate for, if your normal AFR Target is 13 AFR and you add 10% at 25°C and then 0% at 30°C between 25°C and 30°C your AFR target will become 10% richer.
Load / Store / Import Table:
Load: Load a saved AFR enrichment table.
Store: Save the current table configuration.
Import Table: Import enrichment maps from other projects or base tunes.
Purpose: Applies a percentage multiplier to the fuel table values during warm-up, based on RPM and load. This gives more granular control compared to the basic AFR enrichment and allows different enrichment levels at idle versus cruising or revving conditions.
First column (0 cycles) is the cranking enrichment.
Purpose: Temporarily enriches the mixture right after engine start. Cold engines need extra fuel immediately after ignition due to wall wetting and low fuel vaporization. This enrichment fades out over time or engine cycles.
Axes:
Vertical Axis: Coolant temperature (°C)
Horizontal Axis: Engine cycles (0 to 20,000)
Cell Values (% Multiplier):
Higher values (e.g., 300%) mean much richer mixture immediately after starting.
Values decay as the engine warms up and cycles increase, end value should be 100%.
Change Axes: As with WUE strength, you can reconfigure this table’s axes.
ROM Controls:
Load, Store, and Import functions work identically to the other tables.