Tractive force graph (contains photos)

IB Adrian · #1 (**permalink**) 08-23-2005, 10:16 AM

Well, as far as I know one of these hasn't been created yet for the PSD, so I thought I might be the silly idiot that would...

So here goes.
For a start, it is HIGHLY likely I have made mistakes, if anyone would like a copy of the calculations, please PM me, or e-mail me, and I will quite happily forward them to you.

2nd, here are the assumptions I made:
Ford Super Duty 6.0l Power Stroke Diesel

I had to use the 04 engine, because I couldn't find an engine dyno graph for the 05, however the addition of 10lbft shouldn't make a huge difference
For simplicity I used the manual trans.
Assumed 82% of torque makes it to the rear wheels
Crew Cab Long Box 4x4
3.73 rear end - judged this was the most common
Weight of 7600lbs
Tires 265/70 R17's - Most widely available tire on 05's
.0013 Rolling Resistance coefficient - for a truck on pavement - rolling resistance was also calc. to be proportional to 3x10^-6 of the square of the velocity
200m above sea level - air density: 1.202kg/m^3
Coefficient of drag, estimated as 0.52
Frontal Area, estimated as 2.64m^2
10000lb trailer.
Upchange @ 3750rpms
Rolling and aerodynamic resistance of trailer not taken into account (do you think I am MAD!!!)

Above all, this is not going to be 100% correct, power and torque figures were read of a dyno graph with very low resolution. It should be pretty darn close though.

Ok, have converted it to imperial units - mph vs. pound force.
Now, if you are wondering what this all means to you. You probably aren't alone.
You can see the effective force the PSD puts down to the road. in each gear.
So according to this graph:

The PSD's top speed is approx 126mph in top gear.
Or the top speed towing a 10000lb trailer up an 8% grade is: 61mph in 4th (effectively 3rd if the crawler gear is negated).
In 1st (or thr crawler gear) the PSD puts over 7500lb force onto the pavement in High range.
Going up a 2% grade with a 10000lb trailer provides almost the same force against the engine that going up a 5% grade unloaded does.

Daryl Hunter · #2 (**permalink**) 08-23-2005, 10:22 AM

Big, do you have mathcad? I have a worksheet that I did for the V10 vs 6.0 thread last year.

Let me know if you want a copy. It would be interesting to get a copy of your formulas to compare our methods/results.

Daryl

IB Adrian · #3 (**permalink**) 08-23-2005, 10:26 AM

No I don't, I just used Excel...

You have mail.

jackofalltrades · #4 (**permalink**) 08-23-2005, 03:46 PM

Hey Daryl, can you post a link to the V10 vs 6.0 graphs?

-Steve

bilter · #5 (**permalink**) 08-23-2005, 03:54 PM

Man, you guys have waaaay too much time on your hands. Insteresting stuff and I am glad you do though :-). I haven't even had tome to think of that stuff since I graduated college................and that was in '91!

kw5413 · #6 (**permalink**) 08-23-2005, 04:02 PM

Tractive force?

Is that anything like Tractor Beams....Beam me up Scotty!

Everyone that is saying.....

Raise your right hand.

You guys are too much.

IB Tim · #7 (**permalink**) 08-23-2005, 04:14 PM

This is worth pulling up a chair and enjoying....I like this

jackofalltrades · #8 (**permalink**) 08-23-2005, 04:30 PM

Unfortunately, Scottie got beamed up a couple weeks ago.

Hey Tim, I've got to imagine that you've got dyno numbers for a go-cart. Drag coeficients? I need to see a comparison of a cart to a SuperDuty!

-Steve

Daryl Hunter · #9 (**permalink**) 08-23-2005, 04:54 PM

I don't think it would be even close, not even with a SCMT or Predator in HP mode.

0-60, 1/4 mi, top end, all that - the cart would motor away.

IB Tim · #10 (**permalink**) 08-23-2005, 05:04 PM

My little 125 puts out 47.6 and 23.4 of Tq...not bad for something that wieghs in with me at 375...0-60-0 in 3.9...some can get quicker and some a bit slower...top end at 132

Pull 3.9g's in a corner

kw5413 · #11 (**permalink**) 08-23-2005, 05:07 PM

Cart's probably got more miles that the BIG truck.

Daryl Hunter · #12 (**permalink**) 08-23-2005, 05:12 PM

Quote:

Originally Posted by Tim Lamkin

My little 125 puts out 47.6 and 23.4 of Tq...not bad for something that wieghs in with me at 375...0-60-0 in 3.9...some can get quicker and some a bit slower...top end at 132

Pull 3.9g's in a corner

Well, I hear tell that the truck with some mods will do better than 132, but then again, so would a 250 cc cart

Daryl Hunter · #13 (**permalink**) 08-23-2005, 05:17 PM

Quote:

Originally Posted by jackofalltrades

Hey Daryl, can you post a link to the V10 vs 6.0 graphs?

-Steve

See my club FTE web site at http://darylhunter.clubfte.com/

It was really just a comparison of the work output that the V10 could produce compared to the 6.0 - at sea level. A narrowly focused comparison of one aspect of the two trucks and doesn't really say anything about the true difference in driveability between two trucks, one with an '05 V10 and one with a 6.0.

Also note, that my motorcycle web site is no longer up so don't bother clicking on that link on my FTE site. I'll get around to fixing that one of these days.

haroldservice · #14 (**permalink**) 08-24-2005, 12:24 AM

yeah, but what can the cart tow?

Daryl Hunter · #15 (**permalink**) 08-24-2005, 02:26 AM

I don't know about towing, but they sure can haul!!