Gas vs PSD
Fleet Mechanic
Joined: Feb 2007
Posts: 1,852
Likes: 39
Lets assume a heavy trailer on the truck and after exhaustive math, we determine that it will take 7,000 lb ft of axle torque to get it moving up the hill. Speed is irrelevant because the hill is short and once we get to the top, the amount of force required will significantly decrease. So we have a truck with a 6.4, 3.11 1st gear ratio and a 3.73 diff. At 650 lb ft of torque at the flywheel, this truck will produce 7,540 lb ft of axle torque and the truck and trailer start climbing the hill.
Now lets put a V10 in the truck. With the same drivetrain and 457 lb ft of torque, this truck produces 5,301 lb ft at the axle and the truck starts moving backward. So lets fix this problem by giving the V10 4.30 gears. Now it produces 6,111 lb ft, still moving it backward. If we keep giving it steeper gears, we have to go over 4.88 to get our 7,000 lb ft. Just in case you're interested, the 6.4 with 4.30 gears will produce 8,692 lb ft. in this scenario.
The V10, however, will pull harder at 70 mph than the 6.4 will due to hp differences. Sometimes torque is better and sometimes hp is better.
Now lets put a V10 in the truck. With the same drivetrain and 457 lb ft of torque, this truck produces 5,301 lb ft at the axle and the truck starts moving backward. So lets fix this problem by giving the V10 4.30 gears. Now it produces 6,111 lb ft, still moving it backward. If we keep giving it steeper gears, we have to go over 4.88 to get our 7,000 lb ft. Just in case you're interested, the 6.4 with 4.30 gears will produce 8,692 lb ft. in this scenario.
The V10, however, will pull harder at 70 mph than the 6.4 will due to hp differences. Sometimes torque is better and sometimes hp is better.
My only nitpicking would be that you should be using the horsepower peaks for each engine to determine what the ultimate rear-wheel torque would be. Although it doesn't really matter in this example, because you'd have to spin the V10 way up to get there, and with a static non-moving load, that's going to mean a ton of torque converter loss.
Did they make V10's with manuals that had a granny gear, and if so, what was the ratio? 'Cause someone's going to jump in with that scenario, probably.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I have always wanted to do that with my V10, but I have never gotten the chance.
Posting Guru
Joined: Aug 2009
Posts: 2,165
Likes: 0
From: Union Lake MI
My apology to Bill11012 I guess 17 is OK
Sorry if I got your dander up. Lets all protect Bill...He can't drive 55...
It was a long night out pickin up the 79 F350 I over celebrated it was a
in the shop..
Sorry Bill if I offended you last night...I got my warning.
Carry On as usual. My Cummins will out pull your V10
My V10 too..
Post Fiend
Joined: Mar 2006
Posts: 7,841
Likes: 0
From: Vacaville, Ca
That sure looks like a LOT of tongue weight. I don't know that I would have even tried that with my truck.
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
That's not a heavy load; this is:
Posting Guru
Joined: Dec 2006
Posts: 2,498
Likes: 3
From: Windsor, Colorado
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Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
So that has kind of already happened, just not with the power stroke vs V10 thing.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
You do not tow 12K @ 95 on a bumper do you? Just spewing when you are 17 is a little overrated. Like the neg reps & all for others. Now I bet I get one
Sorry if I got your dander up. Lets all protect Bill...He can't drive 55...
It was a long night out pickin up the 79 F350 I over celebrated it was ain the shop..
If I keep it up I will get banned
Sorry Bill if I offended you last night...I got my warning.
Carry On as usual. My Cummins will out pull your V10 My V10 too..
Sorry if I got your dander up. Lets all protect Bill...He can't drive 55...
It was a long night out pickin up the 79 F350 I over celebrated it was a
in the shop..If I keep it up I will get banned
Sorry Bill if I offended you last night...I got my warning.
Carry On as usual. My Cummins will out pull your V10
My V10 too..I will not give you bad rep, I did that one time to that troll.
I am not going around doing that to everyone that says something i dislike.
Do you have a thread for the cummins swap?
I would love to see what you are doing with it.
And no, stock to stock a V10 will out pull it.
You saying that will makes me wander what you are doing to it.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I would only do it with a DRW truck.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,852
Likes: 39
Check out this load. It was on its way to our local nuke plant, but they had some kind of mechanical failure and had to leave it parked in our town for a night or two.
One truck pulling, two trucks pushing. You will notice that there are a couple of operator cabs on the rear of the rig. Each had a steering wheel, so I guess they can really manipulate this thing.
One truck pulling, two trucks pushing. You will notice that there are a couple of operator cabs on the rear of the rig. Each had a steering wheel, so I guess they can really manipulate this thing.
Senior User
Joined: May 2004
Posts: 407
Likes: 0
From: Humble, Texas
I think the important thing that this thread has shown is that you have to go to extreme examples to show one is better than the other. There may be a few of us, myself not included, that go to those extremes. Either engine is fantastic in an SD.
Now with the 6.7 coming out, I may have to move up my 6.0 trade in schedule!
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
That's the biggest heavy haul setup I've ever seen, KelVarnson!
Figure max 20,000 lbs for each axle, 14 axles...could weigh as much as 280,000 lbs for the whole rig, excluding power units.
Amazing.
Figure max 20,000 lbs for each axle, 14 axles...could weigh as much as 280,000 lbs for the whole rig, excluding power units.
Amazing.