Bump for response on this...

 

I have just been scaling injectors. heres the calculation I used for setting the injector scalar value.

Set the injector scalar to a uint16
560cc x 57(uint16) = 31920
31920 / [your injector CCs] = New injector scalar uint16 value

I think an oscilliscope would be the only way to check the injectors real deadtime under differing voltage conditions.

 

In my case, PTE supplied latency information. But the problem is that the system voltage is always around 13.85V. This means I cannot use the latency to correct my rich idle issue without changing the rest of my fuel curve.

I am hoping to figure out what can be done at idle with the MAF values...

 

Changing latency will have more of an effect on idle than it will the rest of your fuel curve. Adding .1ms to your IPW when your IPW is 1ms (such as at idle) has a lot more of an effect than adding .1ms to your IPW when it is 15ms (such as under boost). You shouldn't really rely on the difference between settings at different voltages to adjust IPW at idle vs. cruise vs. heavy load.

-Paul

 

I should be doing some testing this weekend to give more exact numbers and the correct scaling for the MAF table in ECUFlash, but if you really need to change the MAF table, the first one or two values should correlate with idle.

So, for example, you should be able to raise the first one or two values by 10% to calibrate the MAF for 10% more airflow at idle, and thus 10% more fuel.


Eric

 

Understood. And of course the latency should really be set close to the injector specs if possible.

 

Makes sense...thanks. That is what I've been wanting to try when I have time.

 

OK, I'm new to all this, and just started playing with EcuFlash a couple days ago. I think I understand injector scaling and latency no problem, but where are these MAF tables? I do not see them in EcuFlash.

I'm trying to correct a couple idle/part throttle issues, and one is stalling/near stalling when chopping the throttle at light load. My MAF reading goes high, rpms drop to 500, but the MAF is reading what would be normal at about 1800 rpms. It would be nice to be able to lock in a Hz value for a specific rpm like 500. How do I get to the MAF tables?