The Big Three's New Diesels put on a Dyno

With 4 tires on the rollers and securely lashed down there was no wheel slippage.

I think it was the plastic door stickers that limit output on a dyno to below oem bullchit numbers.

4x4ord wrote:
One truck can put 10,000 lb ft of torque to the rear axle and a second truck can put 20,000 lb ft of torque to its rear axle...Who is faster up the hill? There is no way of even guessing without knowing the rpm (or power). Now if we know the first truck has a 400 hp engine and the second truck only 200 we can have a high level of confidence that the 400 hp truck wins.

Sounds good - but the Ford had the highest HP and was the slowest - go figure.

One truck can put 10,000 lb ft of torque to the rear axle and a second truck can put 20,000 lb ft of torque to its rear axle...Who is faster up the hill? There is no way of even guessing without knowing the rpm (or power). Now if we know the first truck has a 400 hp engine and the second truck only 200 we can have a high level of confidence that the 400 hp truck wins.

4x4ord wrote:

RCMAN46 wrote:

Wild Card wrote:

RCMAN46 wrote:

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.

Lets take a look at the spes.

Ram 6.7 385 hp @ 2800 rpm
900 ft/lbs @ 1700 rpm

Ford 6.7 440 hp @ 2800 rpm
925 ft/lbs @ 1800 rpm

Duramax 445 hp @2800 rpm
910 ft/lbs @1600 rpm.

Again... Horse Power is a calculation.

Torque in ft# X RPM /5252, thats it...this is the only way to calculate Horsepower

I also dont buy those numbers above. The V8 diesels red line almost 1k RPM above the I6. Do the math yourself.

Buy the numbers or not but they are the numbers published by the respective truck manufacturers.

Take The time to look them up at the respective truck websites.

Despite popular belief the chassis dynamometer measures horsepower directly and then the computer calculates the torque curve.

Look up how a chassis dynamometer works.

Who cares whether horsepower is measured with a scale, a ruler and a watch or a tach and torque transducer. Either way it is a meaningful value. Torque on the other hand has no time associated with it and is therefore almost useless on its own.

You got that backwards...torque is what gets stuff done. Horsepower is what keeps it moving. They are both equally important.

From Dpach
Sorry, correction. Should read, When traction control kicks in, both Ford and GM limit torque to rear wheels at any speed.

I don't know exactly how the traction control works, but is it possible this was a determining factor for the Chevy? Can anyone verify this?
From Dpach


Borrowed off another discussion on this, this is the GM Service Information on what happens if the truck sees traction issues. WORD FOR WORD, This explains the chevy power IMOA.

When drive wheel slip is noted, the electronic brake control module will enter traction control mode.

First, the electronic brake control module requests the engine control module to reduce the amount of torque to the drive wheels via a serial data message. The engine control module reduces torque to the drive wheels and reports the amount of delivered torque.

If the engine torque reduction does not reduce drive wheel slip, the electronic brake control module will actively apply the brakes on the slipping drive wheel. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent the drive wheels from slipping. The electronic brake control module commands the pump motor and appropriate solenoid valves ON and OFF to apply brake pressure to the slipping wheel.

DirtyOil wrote:
Until they remove the Human factor from these "tests", they're all mute results.

Imagine this... Fish driving the Ram in the test and T&P in the Ford and Homer Simpson in the Chev(GM)... none of them would cross the starting line! :B

D.O, do I get to have the bad ass 6.2? I really don't want to be walking! :B

campingken wrote:
WOW!! Our 2003 Dodge 3500 diesel has a mere 235 HP and 460 pounds of torque.

And it probably does everything you want it to do. :)

goducks10 wrote:
I want a red one. I don't care which brand.

Black ones pull better than red ones. ;)