Ford vs. Ram vs. GM Diesel HP/TQ Ratings

4x4ord wrote:

Cummins12V98 wrote:

blt2ski wrote:
Ron,

8 so has a 4.3 first gear, 10 in the 4.5 relm, compared to your 3.5ish first gear. Better starting gearing. Less pedal easier starts especially on steep grades.
I have not compared as closely on mid to top gears, possibly spaced closer, so assuming your like me, if I can't pull in OF, but in direct I could go redline, but back off to 2800 or so with past diesels, a taller ratio in trans will allow to go faster up a hill.
No one is saying per say your combo is BAD. But from past experience going from 3 to 4 to 5 to 6 and a 7 sp, when the gears are closer together, yet over all splits are wider, even with the sam motor up front, performance, mpg etc is better.
Think about how much better your current rig is vs last one with the 4 sp auto.

Marty

Marty you should set behind my wheel and tell me my truck does not launch flawlessly WITHOUT shudder. I towed my Son's 15 AISIN 3.42 at 28k combined starting on some steep grades without issue and took off flawlessly. I tow in 6th most of the time until getting into the hills. It's just not going to make a hill if beans difference.

Throw the HO 22 Cummins in my truck I am sure it would get to the top faster but by how much. Don't think I would be wishing for more gears.

You’re right that more gears are not going to make much difference in the time it takes for the Ram to get to the top of the hill. With 4.10 gears the Cummins can be kept in the 2100 to 2800 rpm range using just 3rd and 4th gear from 36 mph in 3rd all the way to 65 mph in 4th. The new Cummins is capable of making about 395 hp at 2100 rpm. So using just 3rd and 4th gears the Cummins can deliver 395 to 420 hp at all times. Another way of saying this is that from 36 to 65 mph the Cummins can be kept within 94% of its peak HP output.

Compare that to the Duramax:
The Duramax has very little torque rise meaning the power drops off much more significantly with the loss of engine rpm. To keep the Duramax running within 94% of its peak Hp rating you would need to run it above 2600 rpm …. hence the need for more gears.

So you’re right Ron more gears aren’t required to get the Cummins to perform but if you ever get the opportunity to pull your unit with a new F350 Platinum do it.

PRAISE THE LORD!!!!!!!!!! Nice you get it and back it up with FACTS instead of just saying the other guys have more gears so Cummins/RAM should also.

Thank you!!!