Ram 1500 diesel review
First one I've seen, looks like Ram boosted the tq output for bragging rights in the ads....it's now 430 lbs-ft Linky Still not epa rated, but they got 24 mpg in mixed (city and highway) driving...
Forum Discussion
jus2shy wrote:
To help illustrate wilber's point, I made a comparison on another forum showing the difference in HP generation between Diesel and Gas motors. As you can see, both 6.7's produce far more horsepower at far lower RPM's while the gas motors take a while before they hit their horsepower band. So say you need 200 HP to pull a trailer, the Diesels have that power available at 1500rpm up to their respective redlines. The ecoboost makes that power at 2500rpm while the 6.2L ford takes all the way until 3100 rpm before it's making that power. This is all assuming a 1:1 engine to drive ratio. Gearing makes up for these deficiencies though but it just shows shy Diesels have so much more oooomph!
Trying to stick a google sheet in here:
If that doesn't work, here's a link to a PDF of it:HP Spreadsheet
Another advantage of the diesel is average power under the curve. With a 6 speed and fairly loose converter, the diesel drops only 500 rpm per shift. The Cummins ISB might fall from 380 to 350 hp from a 2 - 3 gear upshift.
Whereas on a gasser, a gear shift can loose 2000 - 3000 rpm. The worst in a modern transmission is probably the RAM's ancient 545RFE, a 1st to 2nd shift will fall from 5500 to 3500 rpm, cutting the HEMI from 395 down to 250ish hp.
To simply math, you could say the an ISB would be averaging 365hp during a highway merge, and the HEMI averaging 325hp.
With the modern 8spd ZF though, the gap is getting closer and closer...
