The injector balance map controls the split between the lower and upper injectors. Generally, the lower injector is used more at lower RPM and throttle settings (TPS), the upper secondary injectors are used more as the throttle opens and the RPM increases.

Figure A: Hayabusa Injector Balance Map

The Injector Balance map allows you to control the split between the lower and upper injectors. This is an advanced setting for high power applications where the maximum amount of injector capacity is required. By setting the injector balance to 50/50 both injectors handle the same amount of fuel delivery. The injector balance always adds up between the two injectors to meet a value of 100%. 

The lower injector is used exclusively at lower RPMs and throttle position, so you will need to check the map to see if the numbers show the percentage usage of the upper or lower injector. 

More detailed information on the use of Injector Balance maps is available in our Woolich Professional Training Course.