I have 38's. Im talkin 3/4 to full throttle with the tunes im running. Even on stock tires OD wont hit till around 90. I could get them to write me a tune with stock power, but adjusted shift points. lol

 

The only thing wrong with your approach is that you should be using the horsepower peak, not the torque peak.

Still, I think a stock V10 has more HP than a stock 7.3, right? If so, the V10 should win, assuming it is geared correctly.

Nonetheless, if I am towing all day long I would rather be doing it at 1750 than at 3750. That's why I prefer the PSD, even with its relatively wimpy HP number.

 

that is only 3000 rpm with 38s and 3.73s.
stock with 3.73s that is 3700 rpm.
my truck will hold second tell 70-71 an third tell about 120.
I had to do the math on the 3 to 4 up shift, 105 is the fastest i have gone in this truck.

 

I respect that.
I do not run 3750 all day, I drove 200 miles in the hills towing 13.5k ( 13' high so it hit a lot of air) and got it over 3000 rpm 3 times.
The first time on a steep hill, took a down shift to second to hold 65.
The second time was passing someone on the free way on a long hill.
The third was the same as the first but the hill was much steeper and I was still picking up speed from a stop.
peak HP would be about the same difference.

 

So, you're trying to say that because your V10 puts out lots of torque higher in the RPM range that it would outpull a PSD which makes torque at less RPMs.

Good thinking, but you don't understand something.

There's a word that's used to describe torque at speed, which is a value based on torque and RPMs. It's called HORSEPOWER.

HP = (Torque x RPM)/5252

An engine may produce more twisting force at it's torque peak, but it pulls the hardest at peak HP. Because peak HP will ALWAYS be higher than peak torque.

Assuming your transmission can hold your truck at peak HP up a grade with a trailer, and mine can as well, my 350 HP will outpull your 265 HP. Every time.

That being said...a 3V, 362 HP V10 would outpull my 350 HP PSD every time as well...

 

how did you come up with 265?
I thought that the 2v V10 put out 310?
what ever the HP of mine is, it puts it out at 4750.
what rpm does the 6.4 put its peak power out at?
I want to get the numbers right so I can do the math again.
I am not trying to prove you wrong, I just want to know.
Your 6.4 may out tow mine, but it was not made when the 2v was.
That was when the 7.3 was made( 6.0 for the last 1.5 years of the 2v) and my 2V gets more to the ground than that does.
the 3V trucks are your truck rivals, mine was never meant to be.
That being said, my truck with the right gears would at least keep you in site on the worst of hills.

 

Sources:
http://www.carsdirect.com/research/s...21A0&year=null

http://www.cars.com/go/crp/research....9616&year=1999

Apparently the F-series trucks had 275 in 1999, then it went to 310 in 2000. I can't find much on the E-series, other than 265 HP for the '99.

As per www.fordvehicles.com, the 6.4L PSD puts out 650 lb-ft @2,000 and 350 HP at 3,000 RPMs.

Using the equation I posted above, that makes for 247 HP @2,000 RPMs and also, solving for torque, 612 lb-ft @3,000 RPMs.

So, that being said, assuming both trucks were geared correctly, your truck would stomp all over a stock 7.3L pulling up a hill. Both the 6.0 and 6.4, however, would outpull you if everything was geared right.

Now that being said, the current gen 3V V10 would, in fact, outpull any stock PSD. That extra 12 HP matters, even if there's a torque deficit, because of the higher RPMs in which the V10 makes it's torque.

Torque is great number for throwing around, but torque is USELESS without RPMs. 1,000,000 lb-ft of torque at 1 RPM is only 190 HP! Torque with respect to RPMs, the true measure of an engine's power, is horsepower.

Bill, don't get me wrong, I think the V10 is a great engine. Come to think about it, I've been agreeing with the V10 guys throughout this entire thread, even though I've never owned one and I DO own a PSD.

I think there's no contest that the V10 is the better value motor. That being said, the PSD does a number of things better, although it HAS to in order to justify the huge price difference.

On edit: If I ever get down your way with my truck, we should meet up and yank some trailers around. I think it'd be a good time, as I've never driven or been in a V10 truck with a trailer.

 

The 310 is PI heads, mine are pre-PI.
with the V10 , 3.73s and 4R100 going 70 in second = 265 hp X 1.54 = 408 X 3.73 = 1522.25 HP at the wheels.
6.4 PSD with torque shift and 3.73s going 70 in 4th = 350 hp X 1.10 = 385 X 3.73 = 1436.05 HP at the wheels.
right?
I think i did that right.

PM me if you do come to texas!

 

Bill ...

I'm STILL in Texus

 

were are you?

 

On the same token, how many semis or construction equipment have you seen that are V8 diesels?

V8s don't make good diesels!

 

Wow, I am late to this party, and no one has mentioned it in a while, so here is some popcorn and beer!!! hehehe

Anyways, there are a couple points not mentioned and not hammered on. My biggest reason for going diesel is gas mileage and fuel range. So a V10 can pull, but when it does you need to stop every 200 miles for fuel. Even though I think my mpg is low at 10 while towing, I can go 260 easy. This is a big deal since my towing is through Montana and Northern, ID with limiting fueling options and 75 mph speed limit. Unloaded I can go 460 miles driving 80, that is so nice.

Second thing, the test from the magazine everyone talked about, was not apples to apples, and the test even mentioned that several times. The diesel was a dually 1-ton and weighed like 1,200 pounds more. Test each engine in the same configuration, other than gearing, and see who outpulls who. And the test was also retarted as living in Montana, I have never seen a 15% grade hill, so there cannot be many around. I think the steepest I drive is 7% and that is a narly pass to go snowmobiling.

Either way, it is about personal preference and usage. I stepped up to a diesel purely for fuel mileage and distance on a tank of fuel. I also like not having to downshift on every tiny hill, makes driving less stressful.

Though if you only tow big twice a year, then a V10 might work for you. The one I have been in I did not like, and neither did the owner, it was in a 2005 F-250. He had it for a year and went to a Hemi 3/4 ton and overall likes that much better. Of course, I don't like the hemi either, but whatever.

Okay, two beers later, and I feel much better!

 

Reps to you for a great example of an often-overlooked point. Additionally, you can have torque with no movement at all.

Horsepower doesn't work like that. The HP at the wheels is the same as that of the engine minus the loss in the drive train. What happens as you progress through the drivetrain is that RPMs go down, but torque goes way up, so the HP remains basically the same (per the formula posted above).

That's what makes it such a useful number. A 350 HP engine will deliver 350 HP at the rear wheels, minus drivetrain losses.

 

You got the idea right, but the wrong terms. Just as KelVarnson posted above, horsepower carries over, torque is what multiplies. Tonight I'll post a better example of this, but I just don't have time before i go to work.

BTW, I am going to be in Dallas tonight, but my pickup is at home, I'm in my work truck at the moment...

 

In the DFW Metroplex ....

but if you have a van, our local drag strip may laugh at us

hmmm, but I have seen snowmobiles and kid's rails there, so maybe not