tuning question

[DAVe3283]

i have never found a need to change pilot timing because i am not changing pilot pulse . not to mention pilot is shut down @ WOT and anything above 2500 rpm

Everyone says that pilot injection shuts off at WOT and above 2500 RPM, but whenever I log my truck, it stays on right up to redline. Is my truck a fluke, or did I mess something up in my tune? (See screenshot...) Mine only turns off after a few seconds of WOT, and doesn't seem to have anything to do with RPM.

I think the jury is still out on any long term issues zero pilot may cause. Naturally you'd tend to think if the engine can endure 2500+ rpm with zero pilot it would also endure 600+ rpm without it. I think the reason there's little data on this is at low RPM pilot injection is actually beneficial as it helps to cause a more complete burn, which means double reasons to leave it alone down low.

Granted that's data I've read, as I've personally never run on a dyno to test if pilot injection helped or hurt my HP @ 800(ish) RPM

I figure why make it loud at idle. But there should be no harm in it, besides the extra noise.

 

[sweetdiesel]

your mm3 value is below .8 for you pilot mm3, that is OFF IIRC
this value can be changed also

I zero my values in my tuner from 2200 + just to make sure

IMO if you are going to completly remove the pilot shot then you should adjust timing accordingly in the lower areas,As IMO the table are set up for this from GM and help efficiancy at idle.....(create work projects )

 

[DAVe3283]

your mm3 value is below .8 for you pilot mm3, that is OFF IIRC
this value can be changed also

If that is true (and it would make sense), then my pilot turns off at ~2800 RPM and WOT, as everyone says.

Where does the 0.8 mm3 come from? Or would logging PILOTBPW make things obvious?

IMO if you are going to completly remove the pilot shot then you should adjust timing accordingly in the lower areas,As IMO the table are set up for this from GM and help efficiancy at idle.....(create work projects )

This makes sense, as my engine can idle for hours and barely burn any fuel. I'd be willing to bet that disabling the pilot at idle, even after adjusting the timing, would use more fuel than with the pilot on. It's almost uncanny how little fuel the Duramax uses when I am running my air compressor, etc.