Mark,
Just read your report, excellent; and information that I have not seen elsewhere on a subject/project that I have spent much time on. Your results are very much like what I have found with only a few differences. I have only had the Edge w/attitude and the Kennedy tow tune and not at the same time so my comparisons can't be as close as yours, but much the same conclusions. With the Edge I did not have a separate EGT so results where just what the Attitude showed; but I could see very little difference in EGT's whether set at stock, stage 1 or stage 2....all high and I really think that the Edge somehow corrupted the stock ECM; in fact I'm pretty sure of it because every time I reflashed the ECM to fresh the truck would run much better and then gradually digress again.
As you found I think the Kennedy tune is probably in the neighborhood of 100 degrees cooler. I really wish I had had an EGT guage on the truck stock so I could see how that compared to with the Kennedy tune.
Something I found interesting was how closely related the intake air and EGT's were (going up and coming down had such an obvious correlation). I never did find out where the temperature sensor was located, to me it must be after turbo because of the highs I saw, I believe as high as 190 degrees?? I also recall getting some feed back from a chap, killer something, that swore that temps at the filter box could be as high as 250 degrees....drugs I think. Anyway what are you seeing for intake air temps with the different tunes?
I have found that the best way to keep the EGT's down to an acceptable level and keep the speed up is to let the engine rev. I find under high load if you try to keep RPM's near the torque peak the EGT's will try to get out of hand very quickly and don't come down quick when you lessen the load with a downshift. Whereas if you anticipate and keep the RPM's up before too much rise in the EGT's you can keep them pretty much under control even with very severe grades. For me Raton Pass going South or La Veta pass going West are good examples. Do you find this to be true?
Again great report, I really enjoyed.
Thanks,
Randy
2011 Chevy 2500HD LML
Red with Dark Cashmer Light Cashmer
Superglide 5th wheel hitch
Bed Rug
Jack Rabbit Full Metal Jacket bed cover
Aries 4" oval step rails
LBZ now lives in Wisc.