Duramax Torque will be 620 lb/ft.

[JACummins2500]

I just got my 2006 GM fleet guide. The torque for the Duramax will be 620 lb/ft for the 2006 model year when equipped with an automatic. Wonder what Dodge/Cummins will do about that. The ISB is good for 660 lb/ft. How about the 48RE?

 

[rbattelle]

What I find most interesting about the 2006 Duramax is the compression ratio has been lowered to 16. 8 (from 17. 4). I'm curious what effect this will have.



-Ryan

 

[ox1]

What I find most interesting about the 2006 Duramax is the compression ratio has been lowered to 16. 8 (from 17. 4). I'm curious what effect this will have.



-Ryan

As long as you can git it to start - it just leaves that much more room in there for "charge air".

 

[BRayls]

with a limiter ??

 

[fox]

I just got my 2006 GM fleet guide. The torque for the Duramax will be 620 lb/ft for the 2006 model year when equipped with an automatic. Wonder what Dodge/Cummins will do about that. The ISB is good for 660 lb/ft. How about the 48RE?

At what RPM ?



4000 ??????

I don't want to run like that all day. I'm happy at 2000rpm and say 850ft/lbs.

No, it hasn't been to a dyno ---YET.

 

[klenger]

A lot of good all that Duramax power does when then derate it in 1st and 5th with the Allison, and don't even offer that level of power with a six speed.

 

[nickleinonen]

A lot of good all that Duramax power does when then derate it in 1st and 5th with the Allison,

i think it is pretty smart on gm's part to do so... you do not need 600+lbs in 1st gear... even OTR truck engines derate the engine torque down in the lower gears... the new 16L volvo makes 2250lbs torque, but in the lower gears, it is derated to 1650lbs [they derate the engine more than my engine makes] and in OD you are pretty much cruising, so you are only using like 100-200hp off the engine... if you get into it on a hill, it will downshift like most people with manual trans do... empty there will be no need for it to downshift [same goes for manuals]. . under full load, yeah, it is needed, but it is also a good idea with a manual to do that too

 

[ttreibel]

Let me guess the new Dodge will be 625 torque.

 

[JRD]

Nope, its been said that Dodge will carry over the same engine from '05 to '06. So it'll remain at 325/610.

 

[JACummins2500]

At what RPM ?



4000 ??????

I don't want to run like that all day. I'm happy at 2000rpm and say 850ft/lbs.

No, it hasn't been to a dyno ---YET.

The guides give very little real info. As such, I cannot say at what RPM. The Cummins was already better in that it developed it's torque at 1600. If I get more, I will post more. BTW, the 2006 Ford guide still list 570lb?ft at 2000 rpm.

 

[JACummins2500]

Nope, its been said that Dodge will carry over the same engine from '05 to '06. So it'll remain at 325/610.

You may be right. However, DCX told me two weeks ago in Colorado that they did not intend to be beat by anyone in this respect. Since the ISB can already be rated at 660 lb/ft. , it is a factor of what the transmission can take.



Besides, the 610 only appeared after GM started the 2005 model year at 605. The first 2005 Dodge's were shipped with 600's.



Time will tell.

 

[JACummins2500]

i think it is pretty smart on gm's part to do so... you do not need 600+lbs in 1st gear... even OTR truck engines derate the engine torque down in the lower gears... the new 16L volvo makes 2250lbs torque, but in the lower gears, it is derated to 1650lbs [they derate the engine more than my engine makes] and in OD you are pretty much cruising, so you are only using like 100-200hp off the engine... if you get into it on a hill, it will downshift like most people with manual trans do... empty there will be no need for it to downshift [same goes for manuals]. . under full load, yeah, it is needed, but it is also a good idea with a manual to do that too

This is true is some cases but it is not universal. Cummins markets this as SmartTorque. Not all engines are so equipped. They will vary between 100 and 200 lb/ft. depending on the rating. However, this is generally done so that the customer can spec in a lighter duty transmission.



The torque does not downshift. It is a factor of which gear the transmission is in. Also, not all of the 16L Volvo's will be sold with automatics or automated transmissions. In all cases, you get the full torque rating in the top two or three gears (which in most cases means overdrive (or both of them if so equipped i. e. RTLO 16913, ect)) and direct. Volvo's 16L must have two torque ratings (in it's highest hp version) as no manufacture (as yet) has a transmission that is rated for 2250lb/ft. . They can get away with this by only allowing that much torque in direct and overdirve(s).

 

[CPG]

Still very happy with our 04. 5 Cummins. Very satisfied with the 48RE too.

Get the same mileage towing as we did with the old first gener "93".

No comparison with the two as far as power goes. Pulls like a "Cat" D9 in the mountains.

 

[jlasich]

The guides give very little real info. As such, I cannot say at what RPM. The Cummins was already better in that it developed it's torque at 1600. If I get more, I will post more. BTW, the 2006 Ford guide still list 570lb?ft at 2000 rpm.

I believe the current LLY peak torque is at 1600, just like the Cummins 600/610. The previous LBA peak torque was at 1800 rpm. Poor Ford. :-laf

 

[KCJackson]

The Cummins ECM allows the engine to keep its torque longer.



Cummins:

610 lb-ft @ 1600 rpm

589 lb-ft @ hp peak rpm (2900)

torque loss: 3. 5%



05 Duramax:

605 lb-ft @ 1600 rpm

525 lb-ft @ hp peak rpm (3100)

torque loss: 13. 3%



The 06 Duramax may up the ante in peak torque, but I prefer the flatter curve of the Cummins, giving me top torque throughout the rev range.



I'm sure DC and Cummins have something up their sleeves for Jan 1 2007

 

[Tim]

Torque is just a number, how about horsepower?

 

[fox]

We have been thru this before!!!



Torque is measured.

Horsepower is just a number from a formula.

Remember, HP needs rpm to look good.

A good tuner can put the torque several places.



Repeat, no one has ever measured horsepower without a formula.

 

[thejeepdude]

Repeat, no one has ever measured horsepower without a formula.

Actually, no one has ever measured torque without a formula, either... that's why it's pound*feet... so it's just a simpler formula. HP just adds time to the equation... 1HP = 33000pound*feet/MIN

 

[K5IP]

Or said another way, torque without movement accomplishes nothing.

Rog

 

[gsbrockman]

"Duramax Torque will be 620 lb/ft. "... ... maybe so, but they still have the sissy IFS. :-laf

Greg