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Drivetrain - 2020+ Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. Seventh Generation...

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Old 09-24-2019, 04:19 PM   #11 (permalink)
LETHAL WEAPON
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Torque may indicate behavior, but not performance. It's overuse as a metric of comparison is what annoys me. I've seen article after article of puzzled auto journalists wondering why their vehicle is so slow despite being able to "feel the torque!".Ican make 1000 ft-lbs of torque, but I doubt many people would want me in their engine bay. My guess is that when a new HD powertrain is developed, a trade study is commissioned. This study could analyze the actual required performance vs required marketing output. The appropriate levers to tweak become the engine geometry itself. Need more torque? Upsize the stroke, or perhaps downsize the turbine wheel and trade some power out on the topside. If the engine was a black box, and I said I had one that made 1000 ft-lbs of torque, and one that made 2000 ft-lbs of torque, are those engines any different? Or did I just slap a 2:1 gear reducer on the back of one of the two identical engines? Which is the better choice?

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Old 09-24-2019, 05:16 PM   #12 (permalink)
heymccall
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Well, seeing as how torque on a diesel is rated at the flywheel, the above seems moot.

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Old 02-02-2020, 03:11 PM   #13 (permalink)
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Cruising at 75 in 10th gear my RPM is at 1500.
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Old 03-10-2020, 08:38 AM   #14 (permalink)
unit
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I find it interesting that the ten speed trans uses second gear from a stop unless in tow/haul mode. In tow/haul they use first gear. Good to know if you're loaded heavy, not towing, and want a little more boost to get things rolling.
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Old 03-12-2020, 03:37 PM   #15 (permalink)
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Originally Posted by unit View Post
I find it interesting that the ten speed trans uses second gear from a stop unless in tow/haul mode. In tow/haul they use first gear. Good to know if you're loaded heavy, not towing, and want a little more boost to get things rolling.
I did not know this, thanks for the heads up!
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