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:
7 th gear is 1:1 in the 10r140 and 6th is 1.277:1. So a downshift at 2114 rpm in 7th brings the engine speed to 2700 in 6th. 5th is 1.519 :1 so dropping from 6th at 2270 rpm would bring the engine up 2700 in 5th.
I hadn't looked at the ratios in a while. But looking at it, I'd drop 9th or 10th gear like a bad habit and stick with only 2 OD ratios and insert another gear somewhere between 4th and 7th, where the trans will spend most of it's time when loaded heavy.
400-500 rpm splits are great. About 100% better than my old 6 speed manual Dodge that was a challenge to get the next gear rolling before you lost 1000rpms.
But personal opinion, I'm not the guy who likes to see how low I can go on the tach and still get a load up a hill, because I've owned a couple EGT gauges and me and the EGT's are both much happier putting a few hundred more rpms through the input shaft. Thus, I don't need 3 OD ratios in a pickup truck, especially if it's not a 4.10 final ratio.
All good discussion! And pertinent to your torque rise examples. What if you could split that torq rise in half or even knock 30% off of it? Bingo, you're sitting at peak power availability more of the time. Whether you need all of it or not.
Which also helps with bsfc.
