Hi! I am trying to get staged injection / secondary injection to work, but have not been successful yet. The issue I am having is that the engine starts running too rich as soon as i am entering into the secondary injection split.
The setup is as illustrated in this diagram below. Four primary injectors are connected individually to the EMU Black. The secondary injectors are wired in pairs each to an injection driver pin. All injectors are the same cc/min size.
I am suspecting that I have misunderstood the staged injection parameters? I have interpreted the Secondary Injectors → Injectors size per output as the individual injector size, 245 cc/min.
Should Secondary Injectors → Injectors size per output instead be the total size of the injectors connected to each bank, i.e 2 * 245 = 490 cc/min?
What should I set Secondary Injectors → Num secondary injectors to?
Appreciate your feedback.
You should enter 490cc/min. It is not enough clarified in the Help.
If still you will be too rich please publish the base map and the log and I will analyze it what could be the problem.
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Thanks for confirmation and your help! Then I will test with 490 cc/min for the secondary injectors. Next track testing is next week hopefully. I will update with how it goes.
Update: The bike now runs good with the updated settings of 490 cc/min for the staged injectors 
I can however not understand fully from the logs if it really is working correctly?
Looking at the log it seems like the injection events for the secondary injectors is a bit intermittent? It looks like it is sometimes injecting for a bit and then stops? I also expected the primary injectors 1-4 to have a much shorter inj time in the Inj outputs signal since the split is set to be 80 %.
I dont fully understand what the Injectors PW and Secondary Inj PW show during split injection.
I think that Secondary Inj PW show only the pulsewidth for each injection event for the secondary injectors, and there are two events per engine cycle for the sec injectors.
What does the Injectors PW show during split injection? Does it show the total injection time for both primary and sec injectors? Does it show only the primary injectors PW?
I am thinking about this setting Minimum inj. time and what it controls? If it as now is 2 ms, is it allowing sec fuel injection if the total sec inj fuel dose per engine cycle is >= 2 ms, or is it only allowing sec fuel injection if each one of the two injections events per engine cycle are >=2 ms?
I tried lowering it to 1 ms, but then the engine would run full lean when entering the sec inj split.
Assuming Minimum Inj time of 2 ms means that the sec injectors can activate if each sec inj pulse is >= 2 ms / 2 = 1 ms, it seems like the sec injection is at the limit for activation since the Secondary Inj PW in the logs are around 1 ms?
20250603_1851_Tisdagsträning_Linköping_Analyzed.emublog3 (391.2 KB)
First of all the injection and axu outputs channel is logged at 25Hz.
So it is ok to check if some outpus are continously on, but it is not a good tool for such events like injection or other PWM stuff (too less frequency).
Split defines injectros flow splint not injection PW split. Both PW shows current PW of primary and seconday injectors.
Min PW means that secondary injectos PW must be higher to inject the fuel.
