Hi everybody. A brief history of my trucks. After my 6.0 troubles, I decided to go to the dark side and bought a 2014 F250 6.2L gasser. Well a couple of trips towing, i just was not happy. I guess I am just a compression addict at heart, so I just traded up to a 2015 Super Duty 6.7 psd. Now, when I had my 2004, the dealer told me I am on turbo #3 because I am towing up hills to fast and running the turbo at too high of boost pressures for extended periods of time. Huh? Well, the 2015's have an all new turbo design and while i have not towed with it, I have never seen the boost guage go over 10 psi. So, when towing, how much can you push this engine? When climbing hills, whats a good boost pressure to stay under? Nothing in the owners manual addressing this. Appreciate any imput from everybody!!

 

The computer will keep your boost at safe levels as long as you are stock. Drive it and enjoy it!

 

I've been able to get mine up to maybe 32psi when accelerating to hwy speed with a good load behind me. When going up long grades I usually don't push too hard, a couple weeks ago I cruised up a grade at 65mph with boost around 25-30, the cooling fan was humming, oil temp remained flat at 230-235, water temp gauge was going up and down pretty quickly.

It's the hardest I've ever worked my 2015 and it was un eventful. Like sea bee says, the computer won't let you destroy the engine, just drive it. Another way to look at it, you've got 100,000 miles to try to blow it up, so just beat on it as you wish.

 

The dealer you took your 2004 to was full of it. If everything was working properly it would never go over 18 psi. The only way that would hurt anything would be if you didn't let it cool down before shutting it off.

 

Thanks for all the info. I really am not going to worry about it with the extended warranty. I was just curious because this boost Guage goes all the way up to 40 psi. My heaviest trailer is just shy of 11000lbs so shouldn't be an issue.

 

Last good grade I pulled at WOT for a several minutes, I notice water temp gauge bouncing around too, wonder what that's about. I think oil temp got to 265. Could only make 50mph with only 6k trailer, 2k camper.
I laugh every time I read people say they can't tell a 12k+ load is behind them. On the hills I climb the truck would only do 25-30mph.
Ford tests these trucks at worst case, WOT at max CGVW and they are designed to survive. Still I can only hold the pedal to the floor for so long.

 

on the 6.0 ford say no more than 24 PSI , I had mine at 30 before
on my 6.7 I have not had it try to go above 20 yet..

 

Wow! What kind of grades are you pulling? I usually have about the same weight as you when loaded for camping with my 7.3 and most of the time I can keep it right around 50 MPH up some of the steeper grades I climb with the pedal matted in 3rd. If I had the power of a 6.7, I doubt it would even need to downshift out of 5th for most of what I would ask it to do.

It gets a little frustrating seeing all you 6.7 guys fly past up the grades. Nowadays, it seems like the semi trucks even have enough power to outpull me unless they are really loaded down.

 

something doesn't seem right here. Are you trying to pull a 12% grade?

I took my 4,000lb trailer up a 6-7% grade and had no trouble maintaining 75mph on a very mild tow tune with my mostly stock 6.0 (no major performance upgrades, just a tune and durability upgrades). I still had a little throttle pedal in reserve. The 6.7 should still have a clear advantage both in power and transmission over my nearly decade-old truck. I've even seen a review on youtube where they towed 14,000lbs up a 7% grade without much trouble maintaining the speed limit.

link to the review:
Btw, to the guy that says a 6.0 only makes 18lbs of boost, a healthy 6.0 makes up to 27-28lbs of boost, even stock. This is only with the torque converter locked at highway speeds though.

I do not own a 6.7, so take what I say with a grain of salt, but something still doesn't seem right here.

 

Yes, I don't get what's wrong with smokies truck, a 2011 would pull at 20psi in 4th gear at 2500 rpm all day, no matter what the grade is. A 2015 truck makes more boost and it would be pumping 30-32 in the same conditions. When I made my heavy run I referenced above I was able to see the difference between the 2011-14 trucks and the new ones. My oil temp never climbed above 240 and my water temp would rise and trigger the cooling fan keeping the oil in the 230° range. This was with 96° ambient temps and running I-40 west from Asheville to Nashville, then things flattened out from there. The quick movement of the water temp gauge was just the reaction from the cooling fan coming up to speed.

 

Same here.......Pulling the steeper grades on the Interstate highways in the Mountain west, I may lose 4-5 MPH with 17000- 18000lbs of trailer behind me. The highest engine oil temp I have seen is 242* for a brief time. That is with ambient temps in the 90's. 30-32PSI boost. I set the cruise at 68, and just sit there and drive! But then I have 3.73 gears
Whenever one lifts and goes with oversize tires, though, all performance goes out the window unless a re-gear is done.
Sometimes, I think people have totally un-realistic expectations of what they can do with these trucks. Even on the big rigs with 600+HP and 2000lb+ TQ, 2 inches larger tire diameter will absolutely kill performance.

 

that's the Eisenhower tunnel/I-70 stretch in Colorado. I had a 6.0l, traded up for a 6.7l and now also have a 6.0l Excursion. 6.7 is just a smarter truck. Both can haul up and down relatively easy, but by virtute of more gears, the 6.7l does it easier. The sequential turbo in the 6.7l definitely shows it's vulnerabilities when you're trying to maintain speed going downhill loaded at 11k feet without touching your brakes.

Both trucks can get you into Silverthorne with cold brakes, but it's what speed do you settle with to ensure it....based on your load.

Back to the OP questions, I heard that after you breach 28psi on the 6.7l, you can blow intercooler boots. I have not done that, but I have my H&S set to defuel above 28psi. At this altitude, it's not often it hits that, however.

 

Something is wrong.


I pull the Eisenhower tunnel last year at 55 WOT with about 25K GCVWR.


close to 30 psi.

 

Just got back from the Eastern Sierras. Seven percent grade for 12 miles pulling a 31' 5er weighing app 15k. Cruise set at 60 mph and she never dropped a mile per hour. Boost was app. 30 psi. I couldn't believe how many vehicles I was passing doing 60!

 

Was the transmission in 4th gear? I can't get 30psi boost unless my rpms are around 2500-2800. Pulls real good don't it? It's fun to work these engines.