2021 Cummins 1075 lbft peak torque at 1356 rpm
Apparently the 2021 Cummins makes its peak torque of 1075 lbft at 1356 rpm. Are you still impressed?
Forum Discussion
I want to show why we don't want 4.10 with a 10 spd, unless you're towing heavy every single day, like a semi tractor.
Cross reference with the BSFC map:
If you're empty, you'd have to drive <70 mph to be in the rpm of peak fuel efficiency. BUT, and that's a big but, at those speeds, even in 10th, you'd never load the engine high enough to be in the peak efficiency zone.
At 70mph we turn 1986 rpm. We need to develop 700 lb-ft with the new engine at that rpm to be at peak fuel efficiency. That's 265 hp. On flat ground, we'll need a 53' semi trailer to need that much hp!
Cross reference with the BSFC map:
If you're empty, you'd have to drive <70 mph to be in the rpm of peak fuel efficiency. BUT, and that's a big but, at those speeds, even in 10th, you'd never load the engine high enough to be in the peak efficiency zone.
At 70mph we turn 1986 rpm. We need to develop 700 lb-ft with the new engine at that rpm to be at peak fuel efficiency. That's 265 hp. On flat ground, we'll need a 53' semi trailer to need that much hp!
