Question regarding fuel injector close angle. I have gleaned from this forum that this parameter setting applies to all fuel injectors equally. If additional fuel injector tuning is required, can be done with ICFT.
Question is with the degree setting. I have seen injector close angle diagrams that, going from left to right, start at "0" degrees to "720" degrees, other diagrams start at "720" degrees to "0" degrees. Both diagrams have "360" degrees in the middle.
I realize that fuel injectors do not close immediately, but wind down so to speak, and that a time of approximately 8 ms is needed to fully atomize fuel at idle - give or take. This atomization time will change as the RPM increases meaning that the amount of time to atomize fuel will probably decrease meaning that the fuel injector close time will need to be changed. Realize that there are other factors that can affect this parameter.
@PSIG mentioned in a post that fuel injector close times can been in the range of 100 to 160 degrees leading me to think that the diagram with, from left to right, the degrees are shown as "0" to "720". Having mentioned the above and for example, using 180 degrees as the idle start point that as the RPM increases minimizing atomization time, a fuel injector close time at 1000 idle RPM can be 180, 2400 RPM - 170, 3200 RPM - 160, and 150 for 4500 RPM and greater. This is with an understanding that up to 1000 idle RPM the fuel injectors will close at the 180 degrees, the ECU interpolates between 1000 and 2400, 2400 and 3200, 3200 and 4500. After 4500 the fuel injector close angle will be fixed at 150. Picture attached:
Valve Openings.jpg (68.69 KiB) Viewed 239 times
As with parameters such as this, experimenting will be required to optimize this parameter. I ask this question to further my understanding of engine tuning.
As an aside, the road trials and engine tuning is progressing well.
Cheers