Injector Scale
The injector scale is used to set the resolution of each increment in the main fuel map.
Note: As a guide, the injector time scale should be set between 10 and 25 when in multi point 1 mode and between 40 and 80 when in multi point 2 mode. If you find that you need to go above or bellow this range you may need to change injector size or there is a problem in the fuel delivery system.
See Injector Arrangement for multi point modes
Each load point has 255 increments representing milliseconds of injector on-time. The Injector scale is used to calculate the number of milliseconds per increment and is used to set the maximum allowable milliseconds for the size of injectors being used.
IE: Larger injectors would require less milliseconds of on-time to supply the same volume of fuel that smaller injectors would require. This means that the injector scale value determines maximum injector on-time attainable.
You can determine the maximum on-time by dividing the injector scale by 2.
This example applies to TPS and Vacuum load points.
EG: By setting the injector scale to 20 the maximum allowable injector on-time will be 10 milliseconds (20 divided by 2). This means that each increment for each load point will be 0.039 milliseconds (10ms divided by 255 increments).
The same principle applies to vacume mapped load points when on the 0 Kpa point. At different load points the ECU varies the actual resolution to compensate for differing air densities.