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 > 2021 Cummins 1075 lbft peak torque at 1356 rpm

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4x4ord

Alberta

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Posted: 01/09/21 09:24am Link  |  Quote  |  Print  |  Notify Moderator

Roy, now that you’ve made your spread sheets is it a fairly simple matter to change the polynomial to get the values to reflect a peak HP of 420 instead of 430? ... I might have initially posted a wrong torque curve before I recognized my mistake and changed it. Because the peak HP is 420 instead of 430 the 10 speed advantage will be considerably less.


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Grit dog

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Posted: 01/09/21 12:21pm Link  |  Quote  |  Print  |  Notify Moderator

Good grief...


"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.

blofgren

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Posted: 01/10/21 10:17am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Good grief...


[emoticon]


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4x4ord

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Posted: 01/10/21 11:34am Link  |  Quote  |  Print  |  Notify Moderator

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.

* This post was edited 01/10/21 11:52am by 4x4ord *

spoon059

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Posted: 01/10/21 12:42pm Link  |  Quote  |  Print  |  Notify Moderator

But, who's ***** is larger at the top of the hill? I mean, that's essentially what we are arguing at this point, isn't it? All 3 pickup trucks can haul to the top of Ike (which I've never once driven and may only do it once or twice in my life, after I've retired and am doing cross country trips) within a very small window of each other.

So, once all three are at the top of the hill, we're only measuring size, right?

Goodness gracious, is it camping season yet? Only 4.5 weeks until my Florida trip...


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4x4ord

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Posted: 01/11/21 06:20am Link  |  Quote  |  Print  |  Notify Moderator

The fuel economy advantage the 10 speed has over the 6 speed is negligible .... many of the scenarios we considered there was no advantage and when there was it was at the very most 4-5% in a very specific case.

If I was getting a Ram I certainly wouldn't be waiting for a 10 speed.
Here is a chart that shows the advantage a 10 speed behind the Cummins would give over leaving it as a 6 speed:
[image]

* This post was last edited 01/11/21 07:01am by 4x4ord *   View edit history

Me Again

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Posted: 01/11/21 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

Isn't time to put this thread out to pasture?


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RoyJ

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Posted: 01/12/21 02:12pm Link  |  Quote  |  Print  |  Notify Moderator

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/20........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)

RoyJ

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Posted: 01/12/21 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

Me Again wrote:

Isn't time to put this thread out to pasture?


Welcome to the internet, folks!

We all have our kicks. For some it's finding the most scenic route, and discussing counter-top options of the latest 5th wheel.

For some it's playing Cummins / Ram engineer wannabe when it's cold and rainy [emoticon]

Me Again

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Posted: 01/12/21 04:51pm Link  |  Quote  |  Print  |  Notify Moderator

RoyJ wrote:

Me Again wrote:

Isn't time to put this thread out to pasture?


Welcome to the internet, folks!

We all have our kicks. For some it's finding the most scenic route, and discussing counter-top options of the latest 5th wheel.

For some it's playing Cummins / Ram engineer wannabe when it's cold and rainy [emoticon]


Where is the like button? Chris

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