Gas vs PSD
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I might be able to. how much power and tq does it make? lol
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
450 HP, 1750 lb-ft torque.
Today I weigh 71,000 lbs. Do you have a trailer big enough to make it an even match?
Today I weigh 71,000 lbs. Do you have a trailer big enough to make it an even match?
Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
oh - that's right 
EVEN though torque is the measure of work and HP is how fast that same amount of work can be done...
NOT that there is any relationship between Torque and HP....
OH, wait, that's there is no relationship between this thread and logic !!!!!
EVEN though torque is the measure of work and HP is how fast that same amount of work can be done...
NOT that there is any relationship between Torque and HP....
OH, wait, that's there is no relationship between this thread and logic !!!!!
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Fleet Mechanic
Joined: Feb 2007
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Likes: 39
I don't recall anyone saying "torque doesn't matter".
And to be perfectly correct, torque is a measure of force, not work. You can have 1750 ft. lbs. of torque, with zero RPM.. (Which, by the way, is zero horsepower)
I'm pretty sure horsepower, which is torque times speed, is a measure of work. So, if you want to know how much work you can do (e.g., how big of a trailer you can pull, and how fast you can pull it up a hill), you need to know how much horsepower you have available.
I knew this thread would get fun again.
And to be perfectly correct, torque is a measure of force, not work. You can have 1750 ft. lbs. of torque, with zero RPM.. (Which, by the way, is zero horsepower)
I'm pretty sure horsepower, which is torque times speed, is a measure of work. So, if you want to know how much work you can do (e.g., how big of a trailer you can pull, and how fast you can pull it up a hill), you need to know how much horsepower you have available.
I knew this thread would get fun again.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Of course it's fun! 
1750 lb-ft torque @ 1200 RPMs
Since, as we discussed 15 pages ago, HP = (HPxTQ)/5252...
400 HP @ 1200 RPMs. I cruise between 12-1400 RPMs, and the engine does not leave this range. Ever. That's why the 13 gears...
So cruising down the highway, I can belt out over 400 HP without downshifting. When I pull a hill, I am ALWAYS putting out more than 400...
Yes, you could take a spartan-ized PSD and gear it to make the same power at 65 MPH, and it theoretically would have the power to lug that same 52,000 lb trailer up the same hill. If the tranny could keep it at the right RPMs, that is, and the engine didn't explode.
Anyone know where Fancy Gap is? It's a 5-mile long 5% grade on I-77 northbound, right at the VA-NC line. Takes me 10 minutes to climb when I'm heavy, at a speed of about 30 MPH, with the engine at full throttle. Any bets on how long a 450 HP PSD would last under that load?
1750 lb-ft torque @ 1200 RPMs
Since, as we discussed 15 pages ago, HP = (HPxTQ)/5252...
400 HP @ 1200 RPMs. I cruise between 12-1400 RPMs, and the engine does not leave this range. Ever. That's why the 13 gears...
So cruising down the highway, I can belt out over 400 HP without downshifting. When I pull a hill, I am ALWAYS putting out more than 400...
Yes, you could take a spartan-ized PSD and gear it to make the same power at 65 MPH, and it theoretically would have the power to lug that same 52,000 lb trailer up the same hill. If the tranny could keep it at the right RPMs, that is, and the engine didn't explode.
Anyone know where Fancy Gap is? It's a 5-mile long 5% grade on I-77 northbound, right at the VA-NC line. Takes me 10 minutes to climb when I'm heavy, at a speed of about 30 MPH, with the engine at full throttle. Any bets on how long a 450 HP PSD would last under that load?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,852
Likes: 39
In a twisted way...
Excellent. What kind of engine is that?
Yeah, but could you do that with a V-10? 
Edit: DANG! Steve Bricks beat me to it!!!
Edit: DANG! Steve Bricks beat me to it!!!
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Mine's got a 2005 Caterpillar C15. Dual-turbo 15.2L straight six.
541,442 miles and counting.....
Heavy duty engines are pretty under-stressed compared to a car or pickup truck engine. As some are no doubt going to point out, my work truck's 450 HP isn't far off from a Dodge Hemi, Toyota 5.7, Chevy 6.2, PSD, or V10.
I believe the biggest difference is durability. I believe a modular V8 or V10 weighs somewhere around 5-600 lbs. A PSD weighs somewhere between 8-1200 lbs. My work truck engine weighs 3,000 lbs, and doesn't put out a great deal more power.
For those who spend a small fortune on expensive synthetics and those who believe a 5-10,000 mile manufacturer specified oil change interval is blasphemy, think about this for a minute. My truck only sees fresh oil every 40,000 miles. And it drinks the regular, non-synthetic Rotella 15W40.
541,442 miles and counting.....
Heavy duty engines are pretty under-stressed compared to a car or pickup truck engine. As some are no doubt going to point out, my work truck's 450 HP isn't far off from a Dodge Hemi, Toyota 5.7, Chevy 6.2, PSD, or V10.
I believe the biggest difference is durability. I believe a modular V8 or V10 weighs somewhere around 5-600 lbs. A PSD weighs somewhere between 8-1200 lbs. My work truck engine weighs 3,000 lbs, and doesn't put out a great deal more power.
For those who spend a small fortune on expensive synthetics and those who believe a 5-10,000 mile manufacturer specified oil change interval is blasphemy, think about this for a minute. My truck only sees fresh oil every 40,000 miles. And it drinks the regular, non-synthetic Rotella 15W40.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
EDIT: I just remembered I can! let me go get my 6 speed V10 ranger and meet you for a pulling contest....
