The Big Three's New Diesels put on a Dyno

If the Ford has the most HP, but slower times...could be internal gear ratios of transmission, weight, final drive ratio, engine computer management programming, etc. I haven't looked at the video or read many of the posts, just looking at possibilities .

Or maybe the power figure ratings got mixed up (switched) with the Chevy. :B

travelnutz wrote:
Total and complete bull as it was staged on purpose as the Duramax clearly out pulled the other 2 up the Ike Gauntlet with ALL 3 pulling the same/equal matched load of total weight and did it with a 3.73 rear ratio while the other 2 had a torque force enhancing 4.10 rear ratio giving 10% more delivered rotational force and they still lost! Get real! The Dyno test done right measures the very same rotational force that had to be delivered as the up hill towing test and defies logic and known physics rules and proven laws.

To be honest, I think the fact that it had a taller 3.73 gear ratio helped the GM get up the hill quicker by allowing it to stay in the rpms it makes the most horsepower longer.

For example, if Ram and the GM were at 42 mph. The Ram would have had to be in 3rd(1.34:1) at around 2,400 rpm because 2nd(2.00:1) gear would have put way it over it's max engine speed. The GM would be in 2nd(1.81:1) gear at around 2,900 rpm making more horsepower since both trucks peak at 2,800 and is putting down more torque due to being in a lower gear.

If the GM had a 4.10 ratio, then it would have been forced to up-shift to 3rd(1.41:1) to 2,500 rpm at that speed because it would have been over the max engine speed in 2nd.

Ram in 3rd gear at 42 mph: 1.34x4.10= 5.49 torque multiplication

GM in 2nd gear at 42 mph: 1.81x3.73= 6.75 torque multiplication

Wild Card wrote:
No brainer that the inline engine produces more torque. Hp is derived by the RPM the engines can spin to...again no brainer that the V engines spin faster thus produce more HP.

Nice to see the dyno on all 3, but until I am passed by a Dyno going up the hill I prefer the real world load tests for reference.

The big problem with your idea is that you are never comparing apples to apples. This is why REAL WORLD data is the dyno. And it is a level playing field no driver is affecting the outcome as is the case in tests where different drivers drive different trucks (even with the same payload) over the same course.

I would not say these results are close in percentage terms but in actual towing you may not "feel" much difference. That does not mean the differences are not there or that they don't matter.

Wild Card wrote:

Flashman wrote:
If I remember from the 1st video - the Ford had a hard time getting up to speed and even had to take 2 runs. With the most HP - it must be some kind of torque management issue.

The dyno run or the gauntlet drag race test?

The dyno they all took 3 runs

On the Ike. They said they were so surprised by how slow the Ford was they ran it twice, and published the best time.

Flashman wrote:
If I remember from the 1st video - the Ford had a hard time getting up to speed and even had to take 2 runs. With the most HP - it must be some kind of torque management issue.

The dyno run or the gauntlet drag race test?

The dyno they all took 3 runs

If I remember from the 1st video - the Ford had a hard time getting up to speed and even had to take 2 runs. With the most HP - it must be some kind of torque management issue.

73guna wrote:
travelnutz,
The Chevrolet dont need the big numbers to shine.
Ill take lower hp/trq numbers and the checkered flag all day. ;)
Numbers really dont mean a thing, it's all in the combo.
In drag racing, for example, its not uncommon to see a lower hp car that is set up right, with a well thought out combination of parts to out shine higher hp cars.

In drag racing it's a matter of being able to control wheel spin so you can transfer that power to the ground. I doubt any of these trucks were having trouble keeping their tires hooked up.

No brainer that the inline engine produces more torque. Hp is derived by the RPM the engines can spin to...again no brainer that the V engines spin faster thus produce more HP.

Nice to see the dyno on all 3, but until I am passed by a Dyno going up the hill I prefer the real world load tests for reference.

None of this would sway me to buy one truck over the other as they are so close. I bought the truck I liked and got the best deal on.

travelnutz,
The Chevrolet dont need the big numbers to shine.
Ill take lower hp/trq numbers and the checkered flag all day. ;)
Numbers really dont mean a thing, it's all in the combo.
In drag racing, for example, its not uncommon to see a lower hp car that is set up right, with a well thought out combination of parts to out shine higher hp cars.

This Duramax continues to impress me more and more!!!