2021 Cummins 1075 lbft peak torque at 1356 rpm

RoyJ wrote:

4x4ord wrote:

Grit dog wrote:
Good grief...

Yup, lot's of confusion. I'm not sure what happened. Immediately after posting my torque curve reflecting 430 peak HP I checked Ram's website and saw they are advertising 420 HP, so, I changed my torque graph within about an hour. I don't know if Roy got a copy of my graph before I changed it or if he was thinking 430 HP from other sources. You can find claims anywhere from 400 to 430 HP for the 2021 Cummins.

Edit: I'm almost certain that even Ram's website was initially showing 430 HP for the HO engine but they currently are advertising 420 HP.

Let's me try re-shaping the equation for 420 hp. I too was confused, some sites quoted 430 hp, some 420.


I don't believe the official specs are on Ram's site yet, but I do see 420 stated on Cummins' site:

https://www.cummins.com/news/releases/2020/12/04/2021-ram-heavy-duty-legendary-pickup-engine-better-ever

What we really need is the official tq / hp curve. If the curve has flat hp plateau like we see on the marine QSB, then a 6 spd vs 10 spd would make very little difference in flat out performance.
In fact, tonight I'll try it for fun with the QSB curve. Let's call it a lightly modded / chipped truck - i.e. programmer in "tow" setting. I bet it'll make absolutely 0 difference (engine hovers @ constant hp during an upshift)

The Ram site is showing 420 peak HP but doesn't say rpm and the peak torque of 1075 and again doesn't mention the rpm.

I would be willing to bet the torque curve I drew is very close to what the actual torque curve will be. If you want a torque curve that would produce a perfectly flat power curve, it would look like this:


Such a torque curve would generate a power curve like this: