Mlgjellybean123 - So the truck doesn't run rough, no shaking, no smoke, boost seems ok. Here is the issue or symptom as best i can describe it. To maintain speed you have to be driving witht he RPM's around 2800-3k. Highway speeds thats about 70mph. I know a lot of folks with campers say going over 65mph is not recommended, dangerous, reckless, etc. When I have this truck at 65mph, the RPM's are around 2,200-2,500 and I can't maintain that speed if I hit a hill, and accelerating from that speed/RPM is challenging, takes forever. So as I'm driving its a game of trying to keep the truck at 70mph, that means picking up speed going down hills so that I don't drop below 70MPH as I go back up the next hill. On large and or long hills its brutal. I gauge how much to accelerate by the EGT temps, trying not to get into the 1,200 mark, mostly keeping it around 1,100, but as speed/RPM's drop I have to downshift, and it becomes a game of trying not to get the EGT's too high, while not losing too much speed, but over time the engine temp gets up there (not sure if its coolant or oil temp) and when it hits 220 I then back off the accelerator regardless of the EGT's let the speed drop, downshitt getting the RPM's high and then I'll see the engine temp cool off or at least maintain and not continue to rise. I live in Las Vegas, but own some rural property in Northern New Mexico, so I pull my 5th wheel through some steep grades in AZ and probably the steepest is around Lake Mead. On the steepest/longest grades I'll drop down to 20-25MPH. Embarrassing but also dangerous.
I've owned this truck for the last two years. I really only get to pull my camper 1-2 times a year, so I haven't pulled with it that much. At first I thought it was just the gearing, like it needed an extra gear to keep the RMP's higher. But after a couple of years of owning it, and taking it to my mechanic describing the above, he thinks there is something wrong leading to a lack of power or torque. That's what led me to have it Dyno'd. I'll post a pic of the Dyno. I also thought, it would be nice to know my HP and Torque now, and then if i replace the injectors I can Dyno it again to see what replacing the injectors did for HP and or Torque.
Bismic - Thanks, its in great shape, interior is in fantastic shape and exterior pretty good as well. It was a single owner truck for quite some time. A guy in MN owned it. He was a snowbird and each winter drove his camper to Tucson, then back to MN in the spring. He sold it to his neighbor in AZ just before Covid hit, his neighbor was going to use it to hotshot, but with Covid the hotshot business dried up (right at the onset of Covid) and that's when he listed it for sale. I dont think he owned it more than a couple months. All of the bullet proofing was done by the original owner. I have the receipts so i'll dig through them and post likely Sat what all was done. Mileage it has around 213k, it had the engine replaced by the dealer under warrantee. I'll look at the receipts to see when what was done including the bulletproofing. I believe 2 injectors were replaced during it's life, but I think all the others are original. Unfortunately i'm not the most mechanical and a lot of everything else you are saying is like a foreign language.
Semjrx2 - Because my mechanic was thinking there could be an injector issue, I read up on them a bit and I see you can go with larger injectors, but there were some who also suggested upgrading the HPOP i think it was. But then i see others say the larger injectors get you more HP but that doesn't help with towing, which seems odd. Glad to hear you were able to fix your issue and your happy with how it pulls now, gives me some hope! As I said earlier, if I can do some maintenance and or some upgrades and get this truck to tow better, I'll likely keep her for quite some time.
Thanks for everyone's input thus far!
