The reference marker
While the engine runs, the ECU is constantly reading values out of each tuning table based on the current operating point, such as RPM and load. ESP shows where that is with a reference marker on the table. Watch it move as you blip the throttle or change load and you'll see exactly which part of the map is in play at any moment.
Because the operating point usually sits between axis values, the ECU blends the surrounding cells, so the marker often falls between several cells rather than squarely in one.
Jumping to it with the spacebar
Press the spacebar and ESP moves your selection to the cell or cells the ECU is currently using. From there you can adjust them straight away with the usual cell editing keys.
How we use it on the dyno
- Hold the engine at a steady RPM and load.
- Press the spacebar to select the cells in use.
- Make a small change and watch the result in your logs or on the dyno.
- Move to the next operating point and repeat.
It removes the guesswork of hunting for the right cell and makes sure your change lands where the engine is actually running. Combine it with All Ranges mode to extend the selection through a whole column, and see selecting cells and modifying tuning tables for the rest of the table tools.
