BroncoHound |
03-03-2009 10:43 AM |
I apologize if that statement came off as rude, it wasn't intended that way. What I mean is, while the 5.9L and 6.7L share many similar characteristics (i read somewhere there is ~40% part interchange), the 6.7L responds as differently with regards to various modifications and running criteria to a 5.9L as a Duramax or Powerstroke does. The engine was built for Chrysler with the intention of sustaining much more heat and for much longer than the 5.9L was in order to remain a reliable system with the (supposedly as equally reliable) emissions equipment in place. Once the emissions equipment has been removed on an otherwise stock truck, the 6.7L drives similar to a moderately modified 5.9L. Thus a moderately modified 6.7L is capable of handling more extreme conditions than a 5.9L modified to a similar level of output.
Example: While I have a PMT, it is used for nothing more than a set of gauges, code clearing at startup, and to calibrate my speedometer for my larger tire size. It stays on the "stock" programming. I also have a Power Puck and keep it to 100% now but it was only installed about 5000 miles ago. I am by no means a power chaser. Bone stock this truck has more than enough power for my needs in a pickup. So, even before the Puck install, going up a steep grade bobtail at 65mph, my EGT could easily climb into the upper 900 degree and lower 1000 degree range. On a stock 5.9L going up the same grade, you would likely only see an upper 700 to lower 800 degree EGT. I've actually performed this experiment using my father's '05 DRW and my '08. These 6.7L trucks just run hotter, but they seem to like it that way and it doesn't seem to affect driveability at all. I normally cruise at 65mph in the 650-750 degree EGT range but, by applying moderate pedal pressure to pass another vehicle, for example, I can hit 1100-1200 degrees in the blink of an eye. Again, this is with the PMT set to "stock" and the Puck at 100%, though it was the same results before the Puck.
Hope this helps to clear up my meaning behind the previous statement. I am by no means a "6.7L is better than 5.9L" guy. I've got my '01 24v with 356000 miles sitting right next to my '08 and she is just the perfect little workhorse. I wouldn't give her up for anything. The 6.7L IS a whole other animal, though.
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