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
4x4ord wrote:
Such a torque curve would generate a power curve like this:
I bet you're not far off. Here's the power curve from the 419hp marine QSB 6.7:
If that's true, no calculations needed - even with the Aisin, you'd just have a constant 420 hp at any reasonable towing speed.
I once wrote a HP-acceleration model in excel when bored working at Daimler. It takes a dyno curve, fitted with an equation, and then uses a finite element model concept to chop up time into 0.1s segments.
I've checked it against magazine 1/4 mile times and it's accurate within 5%. But for trailers, the tough part is finding coefficient of drag and cross section area. At 37k lbs GVW it may not matter much, but with light trailers and 70 mph speeds it would.
Maybe I'll dust it off for fun. I can try parameters like initial speed = 65 mph, grade 7%, GVW 30k lbs, and see how long / how much distance it takes for the rig to slow down to a constant speed.
