Load/RPM: The table is structured with Load on the vertical axis and RPM on the horizontal axis. Each cell represents a specific operating condition.
Values: Each cell contains a numerical value which represents the Ignition Timing (in degrees) for that specific Load/RPM combination. Here, values range from 24.0 at lower load/RPM to 34.0 at higher load/RPM.
Definition: An Ignition Timing table defines the optimal ignition advance for the engine across different operating conditions. The values indicate how many degrees before Top Dead Center (TDC) the spark should occur to achieve the best combustion for performance, efficiency, and emissions.
Purpose: This table is crucial for optimizing engine performance by ensuring the spark occurs at the right time for maximum power output, fuel efficiency, and to prevent knock or pre-ignition.
The values on this table are subject to corrections factors from other tables so the final ignition advance value (ignition advance out) is the value from this table plus all the correction factors applied to it.
Load/Store: Buttons to load settings from memory or store current settings, facilitating the saving and retrieval of tuning configurations.
Import Table: Allows importing pre-configured Ignition Timing tables, useful for starting with a baseline or transferring settings between similar engines.
Selection: Used for selecting specific cells or areas within the table for adjustments or viewing.
% Correction: Provides quick adjustment options for the selected value in the table:
-5%
-1%
1%
5%
Custom: Allows for a custom percentage adjustment, with a current setting of 0%.
Fixed Advance: Option to set a fixed ignition advance, currently set to 10.0 deg. This can be useful for initial setup or troubleshooting by locking the ignition timing at a constant value and calibrate the trigger angle offset.
Primary Table: Allows selection between different ignition timing tables if available (e.g., Primary and Secondary).
Import Table: Import settings from other sources or previous configurations to start with a known good baseline for ignition timing.
Auto Cursor: Useful for real-time tuning where the ECU might highlight or focus on the current operating point, showing where the engine is in relation to the ignition timing settings.
% Correction: Use these buttons for quick adjustments to ignition timing. For example, if you need a slight advance or retard, use +1% or -1%. For more precise control, use Custom.
Remember, this table sets the target ignition timing; actual timing might be influenced by knock control, CLT and IAT temperature corrections, or other real-time adjustments made by the ECU.
Start with a broad map and refine by focusing on areas where the engine spends most of its time or where performance issues like knock or poor power delivery are noted.
Use % Correction for small, incremental changes to ignition timing, especially when fine-tuning. Always log data before and after adjustments to track changes in engine performance, knock presence, and efficiency.
When importing tables, ensure they match your engine's characteristics or adjust the ignition timing values accordingly.
If using 'Auto Cursor', monitor how the ECU interacts with the table during operation to understand real-world tuning needs for ignition timing.
Tuning ignition timing involves balancing power, fuel efficiency, emissions, and engine protection (knock prevention). Always test changes in a controlled environment, preferably on a dynamometer or during safe road testing.