The injection times needed by the engine at different conditions are stored by the ECU in a table of numbers called a look-up table. The ECU determines the engine's load and speed, and uses these two parameters as an index to the table. This table is called the Base Fuel table.
Example: At an engine speed of 4000 rpm and at –20kPa, the relevant number in the table may be 4.35. If the engine approximates -20kPa at 4000 rpm, then the computer will extract the value of 4.35ms from the table as the base injection time. This value is then adjusted to compensate for numerous conditions, such as temperature. The ECU then holds the injectors open for that time on the next injection.
The Ignition Tables work in a similar way, except that it is the ignition advance that is stored in the look-up table instead of the injection time.
Tuning Base Tables
Tuning Method Injection Time The fuel table contain the base injection time for the given load and RPM at which the engine is operating. The base fuel map has the greatest influence on the air/fuel (A/F) mixtures. With injection time tuning, you ...
The Transient Throttle tables should be set up after the fuel and maps are correctly tuned for steady load running. Attempting to smooth out engine transients before the fuel maps have been optimised for steady state running may become confusing. ...
ESP – the key to unlocking Elite’s features
More functions, more flexible maps, upgraded data logging, self learning, and a host of additional features are all contained in the new Elite 2500 ECU, but to access them you will need to use the all new ESP software. Let’s take a quick look at some ...
Modifying Tuning Tables
WARNING: When tuning an engine, especially under load, it is advisable to have an indication of the Air-fuel ratio at which the engine is running. It is recommended that a wide-band oxygen sensor be used for this since it displays the Air-Fuel ratio ...
Selecting Tuning Tables
The ECU navigator allows quick access to all tuning tables. The currently view tuning table can be changed at any time by the following methods: Click on the desired table using the left mouse button. or Use 'Alt' with the 'up' and 'down' keys to ...