Understanding injector Duty cycle

[danielhilgersom]

I don't completely understand the duty cycle table and injection time used in SManager.

Attached a log file and a fuel map.

So in the log file I run with 0.32 bar boost at 5000 rpm, the AFR is 14.23 so I like to increase the amount of fuel.
The injector timing is 16.65ms and Duty is 70%, so I expect that I'm able to increase the injection time.
I understand that with the same injection duration of ~16ms at higher rpm's the duty cycle will go to around 100% at 7000rpm.
But I don't completely understand why I'm not able to have longer injection duration at lower rpms (for example 5000rpm).
As you can see at the 7200 rpms my AFR is going to 11.88, which is great, therefore I like to increase the injection duration at 5000rpm because this seems to solve my problem.

In the Fuel map I see that in that operating point my injector duty is above 100% so it makes sense that this is the limiting factor.
But I don't see where this limitation comes from, which calculation/parameters are behind the duty cycles in the fuel map?
Is this a setting that cannot be changed by the user?

Obviously I understand that I can buy larger injectors but for my own understanding I like to understand where the duty cycles in the fuel table come from.

[Spunkster]

What sized injectors are you using and what fuel pressure are you running at?

[danielhilgersom]

It's a stock Honda Accord 1999 with F20B6 engine.
The only thing I've added is something to create boost and a wide band lambda (and the Hondata s300).
So the injectors are stock and what I found they should be 310cc injectors.

[danielhilgersom]

So I don't measure the fuel pressure but it's a stock fuel pump.

[Spunkster]

You are maxing out the injectors. You need larger injectors to run boost safely. There is more to consider than just RPM, You must also consider the load and how much boost you are running. You need to determine your horse power goals and then get the appropriate injectors to achieve that goal.

[danielhilgersom]

Thanks, I found larger injectors so I will install these.