F450 vs Ram 3500 DRW tow vehicle
So the wife and I are moving to the full time RV lifestyle. We just purchased a 42' toy hauler this weekend, with a GVWR of 20K#. Now I'm looking at a tow vehicles. I'm considering either purchasing a...
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Well I'll be darned, that is indeed a very steep, in fact, negative slope on the ideal BSFC land!
With these curves, you could have a situation where a downshift @ light load gives better economy. Especially with the 2019 spec and a hypothetical 10 spd. If you were WOT @ 1500, a downshift to 9th / 8th could land in the sweet spot, at say 60% loading and 1900 rpm.
These graphs reveal another interesting point, modern diesel pickups are tuned so aggressive it's difficult to achieve good economy at 65 mph empty cruise. You'll be at roughly 200 Nm output, 1500 rpm. No matter what gear we choose, it'll end up in a poor region.
Unless it's geared so tall that it cruises at 1000 pm, bringing torque up to the 350 Nm region.
With these curves, you could have a situation where a downshift @ light load gives better economy. Especially with the 2019 spec and a hypothetical 10 spd. If you were WOT @ 1500, a downshift to 9th / 8th could land in the sweet spot, at say 60% loading and 1900 rpm.
These graphs reveal another interesting point, modern diesel pickups are tuned so aggressive it's difficult to achieve good economy at 65 mph empty cruise. You'll be at roughly 200 Nm output, 1500 rpm. No matter what gear we choose, it'll end up in a poor region.
Unless it's geared so tall that it cruises at 1000 pm, bringing torque up to the 350 Nm region.
