Ford 6.7L 1050 ft lbs TQ at 1,600 rpm, 475 HP at 2,800 rpm

4x4ord wrote:

rjstractor wrote:

ShinerBock wrote:
Yeah. If this is sustained power, then it should easily mop the floor with the other two.

Advertisement laws do not require a manufacturer to advertise sustained power numbers. All they have to so is reach a certain power level in a short burst in accordance to SAE procedures which is at low altitudes. Some manufacturers factor in sustained power, and some don't. I wish sustained power numbers was a requirement for the J2807 tow standard meaning you can only advertise the lowest power an engine makes performing the up hill test. I have a feeling that some of the power ratings would drop considerably if it were.

Agreed. I'm not exactly sure how commercial truck engines are rated, but I have a feeling that the early 2000s Freightliner I occasionally drive will put out its rated 515 hp for hours at a time. I'd love to run it up the Ike pulling 60K combined against the new Ford at 40K. I think I know which one would do better...

I think you're right that a 515 hp engine in a heavy duty truck can put out peak power all day long. These pick up truck engines may also be capable of running at peak power all day long. It is possible that the reason they don't make advertised hp on the Ike run is due to the extreme elevation. I wonder if the turbos on the pick up truck engines are capable of pumping enough air at 10,000 feet elevation to allow full fuel to be delivered? Maybe fuel is restricted under those conditions to prevent excessive exhaust gas temperatures?

This is why I wish these guys would invest in an Edge CTS2 monitor or a Banks monitor. These will tell you for sure if fuel is being cut or not. As far as turbo's go, it depends on many things like blade size, blade composition, blade count, blade profile, bearing type, housing a/r ratio, and a few other things on whether it can pump enough air at higher altitudes. It just depends on how the manufacturer designed the turbo and what they want out of it. Some may have designed it to make the same power for all situations even up to 10k ft, which means you won't have high power numbers. Others may have designed it for better power numbers at low altitude, but loses efficiency as elevation increases.

There is not a doubt in my mind that the new PSD will defuel if towing heavy in Ike with those power numbers. They can barely be sustained towing that much with a deleted truck with no restrictive emissions systems let alone with them on. That 475hp is about 410 hp at the wheels which is right around the light tow tune on a deleted truck with all other stock components like turbo and fuel. Another draw back is the water to air intercooler on the new PSD's which is good for short burst power with time to cool off in between, but they are not good for sustained power once they get heat soaked. You are drawing in hot air at that point which causes hotter EGT's.

As far as the big diesel versus smaller diesel making the same power, of course the bigger diesel will be able to sustain those power numbers better because it is able to move more air for the amount of fuel needed to make 515hp. Although, 515 hp is about 450 at the wheels which is my level 2 tune. When I was tuned, but had my emissions system, I could barely sustain that power level towing 5k under high load. When I was tuned and deleted, but had the stock turbo, I could maybe tow about 8k-10k sustained at that power level. Now that I have a larger turbo with more air flow, I can easily tow my 14k trailer sustained at that power level.