I posted some info on a thread. But figured I'd just post it all up here.
07.5-09 3rd Gen
Here is how your duration and timing tables are arranged within MCC.
You'll notice that you have 4 settings for duration maps and 9 for timing maps. Duration Maps are no power, mild, wild, hot. 6 EOM timing maps and mild, wild, and hot.
EOM timing maps are engine operating maps. So at different elevations (Mainly) your ecm will use these to adjust the timing. Can be a very useful tool or can all be set to the same.
Biggest thing to notice is that you have a seperate timing map for each different duration map. This is the only way to have different duration maps and actually use them correctly.
Now here is the stock tuning both with respect to duration and timing.
Here's the same truck in efi-
So you can see your stock values. If your curious as to what values are in there now, export a tune via mcc (you don't need the unlock to export and play, only to load it in there). Just make sure you select the same settings you did when you loaded H&S on the last time. So if you select default everything, do the same thing. If you want to see what the next level get's you, go in and export another tune. Just make sure you've saved the first one off the sd card before exporting another one. It uses the same name for the file every time and thus will write over your previous export.
Now on to you 4th gen guys..
Here's the same pictures but with a 2012:
This is your grouping and shows where you only have the EOM timing maps, not the the mild,wild, & hot maps like with the cm2100 controller (07.5-09 6.7)
Here's your stock values for duration and timing
1st. your going to notice that duration isn't measured in micro seconds anymore. Its measured in mili seconds. No big deal. Just a different unit of measurement.
You can also export out the same way and look at your tuning using the mcc export. Once again this doesn't require the unlock. Just update it and export it out and look at what your actually running..
Here's the no power setting with the default timing selected for a 2012 truck..
Notice how on the factory tuning it is asking for 1.9ms with 17* of timing, now your asking for 1.5ms with 23* of timing..
To give you an example:
At 2800 rpms, 18* of timing & 2.0ms of duration, your commanding roughly 51% btdc & 49% atdc. At 2800 rpms, 23* of timing and 1.5ms of duration your commanding 70% btdc & 30% atdc.
My general rule of thumb is 48% btdc for mileage, 52% btdc For performance. Keep going above 52% and your getting more and more aggressive. There's no way I would build a tune with more than 55-56% btdc on anything but a highly modified purpose built rig and the customers expressed approval and request.
I hope this helps a little bit. I realize that I opened Pandora's box with this stuff. But I just didn't want you guys running around on level 3 or higher timing and thinking you were good to go on the no power setting. I'm not saying this is going to kill your hg. I'm telling you that your playing with fire and sooner or later its probably going to happen.
Do with it what you want. I just wanted to post somethings up about it.