No, I did not know when the thread started. It was a few weeks after that I started hearing rumors of them dropping it.

Yea, the whole 2011 superduty looks great with either engine.

The only thing that would make me move to bigger truck would be if I got into hotshot, and the work is just not there to do that. I like my SRW truck, its better off road and not a pain to drive in the city. Unless I have to have the payload to take the pin weight of a GN, I plan on staying with SRW F350s.

The V10 can run a gear lower and not over rev. If you try and run your PSD in the same gear as me up a grade, you will dump parts out of the block.

 

Why is that?

 

I was looking for a SRW F-350 myself couldnt find one at the time so we went 250.

 

Who says I have to run in the same gear as you? You're the one that has to crank 4500 rpm, not the PSD.

 

Really? This thread is still alive?

 

I don't understand whatcha mean.


I must be misunderstanding you. Are you saying you can pull the same speed in 3rd as I can in 4th?

 

Yes it is, If you have not yet, Give Bill some Reps for starting one of the longest documented arguments on the Internet.

 

For any given road speed, the diesel will have to be in a higher gear then the V10. The diesel can't drop many gears because if its low rev limit.

Say you hit a hill at 75MPH with a PSD (and 5spd torqshift). Assume 3100 RPM redline, 31" tires and 3:73 rear gears. That diesel will only be able to drop down to 4th. If you're going above 77, it won't be able to downshift at all. A V10 with a 5300 RPM redline and 3.73s will be able to downshift all the way to 3rd (4700 RPM). You could be going as fast as 83 and the V10 will still be able to downshift to 3rd.

For curiosity's sake, lets run some math: 75 MPH road speed with 31" tires:

362 HP V10 @ 4700 RPM = 404 lb-ft. 3rd gear ratio of 1.545:1, 3:73 rear gears = 2328 lb-ft to the wheels.

362 HP V10 @ 4700 RPM = 404 lb-ft. 3rd gear ratio of 1.545:1, 4.10 rear gears = 2559 lb-ft to the wheels (V10 can still pull 3rd gear @ 75MPH with 4.10 gears)

350 HP 6.4 @ 3100 RPM = 600 lb-ft. 4th gear ratio of 1:1, 3.73 rear gears = 2238 lb-ft to the rear wheels.

Look at that, the V10 is able to put more torque to the ground traveling at the same highway speed as a 6.4. Both engines in a gear which puts them right at the peak of their power output. Hmm..

That's exactly what he is saying.

 

No problem with reps, but I have seen long threads "gasser v/s diesels" on RV forum about 10 years ago.
We are only 900 replies from 10,000. I am going for it. Shall I be ready ... tomorrow??

 

I didn't check it, but I believe you compared the torque at the rpm giving it a max.
But who drives with one speed and one speed only? In real World gasoline engine with steep curve will drop the torque like crazy going down or up from listed rpm. This is where diesel will beat it senseless with pretty flat torque curve.

 

Nope, I already factored that in. I derived my torque numbers from the peak HP RPM.

The V10 has a peak torque of 457 lb-ft, but at its peak 362 HP RPM (4700 RPM), it is only making 404 lb-ft. So I used 404 in my calculations.

I did the same with the 6.4: The 6.4 is rated at 650 lb-ft @ 2000 RPM, but at its peak 350 HP RPM (3000) it is only making 600 lb-ft

Also, the modular series gas engines (and just about every other modern big-displacement gas engine actually) have very broad, very flat torque curves. A V10 generates 90% of its peak 457 lb-ft at just 1200 RPM, and maintains at least 400 lb-ft all the way to 4700 RPM (and probably a bit beyond). These aren't like that 1970-1990s truck V8 gassers that run out of breath and call it quits once they hit 3500 RPM...

 

Same arguments for 600 pages

 

I will stay with the SRW trucks unless I start towing gooseneck trailers that have a pin weight higher than what my truck can take.


Yes. I have to run higher RPMs to make the same power, and I need the extra gearing to make as much torque at the ground as you.

 

How bout this, you keep throwing out the "hp is the only thing that matters, my v10 will outpull your psd as long as it has more horsepower." So I think the onus is on you to prove it, especially since every test we have seen shows the opposite.

 

It can, will, and has. Come down to the 6.2L forum and look at THIS THREAD.

In short...

Mike(FordMDB)'s 2011 6.2L truck 0-60 towing 11,000 lbs:



Picasa Web Albums - Mike - 2011 6.2L F350

My '08 6.4L towing 11,000 lbs 0-60:



YouTube - video-2010-05-09-15-23-15

Mike's 6.2L beat me by 5 seconds!!!