2021 Ram 3500 H.O.

ShinerBock wrote:
If you knew that, then why did you say... "I’m just saying that Cummins doesn’t appear to be anymore honest than Ford in how they rate their engine"? Anyone who knows that you loose power at altitude would know that the small loses you stated would be due to altitude, not defueling or overrating numbers.

Like I said, do the same test at 80F and see what happens. My bet is that one engine will have to defuel considerably more than the other. You will likely have the same scenario in 2017 where the 440 HP PSD was a few seconds behind the 385 CTD. However, due to to the 10-speed, the PSD would likely fair better rather than being a little behind.

I have calculated the power required to climb the Eisenhower pass in 620 seconds and so I know these engines had to be putting out very close to their rated numbers... I don't want to complicate our discussion with how much power they make at sea level vs on top a mountain.

I realize that you believe the Powerstroke will defuel more than the Cummins, maybe your right ... but there is certainly reason to think the Powerstroke will always be making more power than the Cummins. According to TFL the Powerstroke made it to the top of the hill on less fuel than the Ram. The extra fuel that the Ram used was lost as heat through its cooling system and/or out the tailpipe. Because the Powerstroke is more efficient it would require less cooling to make an equal amount of power. Unless Ram has very recently increased the capacity of its cooling system I believe the Ford has a significantly greater potential for cooling between its radiators and charge air cooling system. So although it is possible that the Ford will defuel more than the Cummins does on an 80 degree day, I'm not aware of any reason to expect there to be an outside temperature where the Ram would make equal power to the Ford. It really would be interesting to see how warm the outside air temperature could get before the trucks start defueling.