Syndicate

hey guys what is the highest HP truck running a stock VGT turbo right now? Im just curious how much fuel that thing can keep cool. My lease is up in May and I may just get a new truck.

BroncoHound

600hp is nowhere near unreasonable. A bunch of guys are getting 550hp out of just a couple of stacked programmers and a stage 1 CP3 (along with a DPF and EGR delete, of course). There's a guy on cumminsforum that is right at 700hp, but he is running compounds, using the OEM VGT as the lower.

Syndicate

ok those numbers sound pretty high. I wonder how much fuel it can actually keep cool on the street. In other words how many real USABLE horespower can it keep under say 1500*F. I would guess 450 Hp maybe 500 Hp based on the post above. Does that sound about right?

BroncoHound

If you are going to mod a 6.7L, you have to leave your 5.9L misgivings at the door. 1500 degrees EGT isn't really anything to worry about with the 6.7L. Stock trucks can see 1500 degrees during a regen. One member on cumminsforum dyno'd at ~560hp with a Bully Dog PMT set to Xtreme, an MP-8 at 100%, and a Bag O' Parts. You could drive around with 500hp to the wheels and still have a very driveable truck, IMO.

Syndicate

Im not even goin to respond to that! not much point.

BroncoHound

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.

Syndicate

Just an FYI my 05 bone stock would easily hit 1400*