Third party testing has indicated a fairly small difference between the 2020 6.7 and the 2023 6.7 HO. A post I made on an RV forum;

I watched this last night and have some mixed feelings about it; the biggest issue is their last shootout was in 2020 and they towed a gooseneck + excavator weighing 30,000 lbs....IF they had stuck with the same weight we would be able to directly compare the 2020 results to the 2023 results....as it is we have to infer what we will from the data:

2020 - 30,000 lbs:

- GM Duramax 445/910 - 11 min 47 sec.
- Ram 400/1,000 - 11 min 32 sec.
- Ford 475/1050 - 10 min 20 sec.

2023 - 27,000 lbs:

- GM Duramax 470/975 - 10 min 19 sec.
- Ford PSD 500/1200 - 10 min. 6 sec.
- Ram 400/1075 - TBD

I'm impressed with the GMC; it seems to be punching above it's advertised output though it is obviously not as powerful as the STANDARD output 6.7 PSD, nevermind the HO since it posted an almost identical time to the 2020 test but towing 10% less. I honestly expected a bit more out of the PSD HO since it only shaved off 14 seconds from the SO (again pulling 10% less)....obviously there is less than 10 seconds difference between the standard and HO versions...if that. In 2020, the Ford was far ahead of the others, now the GM is pretty close.

It will be interesting to see where Ram comes in but since it is stuck with a 6spd, I suspect it will be well behind the Ford and GM - hope I'm wrong.

Please note that while TFL calls 10 seconds flat a "perfect run"; that is NOT at the posted speed limit - the best trucks were holding around 45mph......it would be 8 minutes or less at the speed limit so these tests give you real world comparisons between these trucks at high elevation on a long steep grade, loaded to max (or near max) GCVWR.

As the others have said, for a 6,000 - 8,000 lb trailer, you won't notice any difference. I can pull my 10,000 lb trailer up any grade I've encountered at the speed limit...easily.



2 cents,
Dave

 

yup for me the really only place i notice is after your moving, say 4th gear and up to 7th the tq is strong, pulling the heavy hauler trailer.

i just smile every-time i drive it, its by far my best superduty in boatr comfort so far on this old body

 

Yeah in the ½ ton diesel world Ram did this same thing a few years back. They released the Gen 3 EcoDiesel with a “class leading 480 lb/ft of torque”. But then a company called Green Diesel Engineering, comprised of a couple of guys who are former OE engineers, bought one to start diagnosing so they could write aftermarket tuning for it and what they discovered is that the ECU only allowed 480 lb/ft of torque in 5th gear (8 speed transmission) and only at specific times. This allowed Ram to claim 480 lb/ft and therefore claim the title, but in practice the engine was rarely ever making that much torque. Torque management in the tuning was heavy handed to protect the drivetrain.

I suspect the same thing is going on here. Ford allows the “H.O.” engine to make 1,200 lb/ft at very specific times, but in general it’s not putting out that much power. How else do you explain the GM trucks, which have always been rated for significantly lower power, keeping up with the Ford unloaded or loaded?

 

At low speeds/lower gears the SO seems to perform much better to me. They are limiting the power on the HO in those situations. At higher speeds the HO definitley performs better than the SO.
It can be a bit frustrating in the low speed situations.

 

I agree though I'd clarify that while the GM trucks are getting close (much closer than the numbers suggest they should) they aren't quite "keeping up" ; all 2020+ versions of the 6.7 PSD outperform the 6.6 DM in loaded towing.....and the heavier the load the bigger the gap. Ford's still on top, just not as much as the numbers suggest they should be.

Dave

 

Not much better according to the numbers I posted......though a 2023+ SO isn't exactly identical to a 2020-2022 6.7. Even with my 2022, I've found that if I turn off the traction control system, I have much better throttle response off the line.

Dave

 

It's all marketing Hocus Pocus

500HP.....
1200TQ.....

Now come pay me an extra $3,000!!!

 

That isn't what a lot of the TFL videos recently (or from years gone by for that matter) would indicate. The Ford can't even put a full truck length on the GM with a trailer in tow.

 

I know the video that you are referring to; it was a VERY light trailer over a very short distance and the fact is that the GM does comparatively better the less it is loaded down vs. the Ford. Loaded up to max or near max, the Ford has a solid lead albeit a shrinking one in the past year or so. Refer to the results of the videos I posted earlier, a can post links if you like. Loaded to GCVWR, my 2022 Superduty will still outpull a 2025 GMC.

Dave

 

So what you're saying is you believe in GM's marketing on their HP and Torque.

 

Short spurt power doesn't do much good in the real world when high EGT's command reduced power output when pulling a heavy load over a long grade. I suspect Fords HO PSD water cooled turbo jacket and steel pistons allow for higher power levels for longer duration than the Chevy.

 

All I'm saying is that for YEARS I have watched the GM trucks run fender to fender with the Ford trucks, loaded or unloaded, despite having far less *rated* horsepower and torque. And, dyno runs we've seen would indicate that GM isn't really lying about their horsepower and torque. So, the only explanation I can come to is that Ford must be playing tricks with their tuning to get the big numbers on paper, but in reality the engine isn't delivering that much power.

 

When I ordered my truck it was supposed to have the HO but it got ordered without it and I was disapointed that I did not get the HO my boat weights about 10000LB and we have a pretty good climb out of Lake Mead into Boulder city. My son in law has the same truck with the HO in it and I used it a couple times and I did notice a slight difference pulling the hill but it was so slight that I am no longer disapointed that I do not have the HO as both have enough power to pull hills with no issues. at 10000LB
Knowing this I think it is fine with either motor and just up to you if you want to pay the extra for the HO or not

 

While I tend to agree with you on the accuracy of the HP/TQ numbers used and the effects of the torque management software, I don't see where your "fender to fender" analogy is accurate....certainly not loaded. Again;

2020 - 30,000 lbs:

- GM Duramax 445/910 - 11 min 47 sec.
- Ram 400/1,000 - 11 min 32 sec.
- Ford 475/1050 - 10 min 20 sec.

That's almost a minute and a half......which is huge.

Dave

 

Are those your numbers?

I'm talking about not only MULTIPLE videos and magazine reviews I've seen over the years, but also first hand experience.