Originally Posted by sailorbob

There are two elements that affect the ability of an ecu to control large injectors at small pulsewidths;

i) The resolution in the software to command the small pulsewidths required at idle. i.e. not all ecu's have the ability to do this.

ii) The ability of the hardware to drive the injectors open fast enough and for them to close quickly enough to produce repeatable small pulsewidths. Again, this depends on the ecu and injectors.

So, it it is not as simple as saying whether 8 smaller or 4 larger injectors is better and you need to know about the system controlling them.