this post was submitted on 12 Jun 2024
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Also all of them have locking torque converters so there is no energy loss at constant speed. Also also, unless going upward at an incline. Most of the power requirements come from aerodynamic drag, not rolling friction of the trailer.
You can't lock the converter when accelerating because ~~that's not a constant speed~~ you'll stall the motor under the torque load, and to accelerate you need to overcome momentum. Neither drag nor rolling friction are anywhere close to high torque.
And I have no idea what the previous poster meant with a transmission cooler, I guess it's a different thing because a torque converter very much is not a transmission, if you want to compare it to anything then to a clutch. In any case I've got that explanation from an actual American actual car mechanic and random lemmings aren't going to change my mind especially while making no mechanical sense.
No, you can accelerate and deccelerate. Only needs to unlock for gear changes.
Only in city would the torque converter spend an appreciable amount of time unlocked but then again, in the city you won't be moving fast either
Neutral to one is a gear change and connecting gear one firmly to the motor is going to stall it when you're accelerating from standstill. With a petrol engine just the torque needed to get going is going to stall it that's why you slip the clutch with a manual, a trailer will also stall diesels.
With a torque converter in between you'll also have to let it slip as it's serving the function of a clutch. Trying to slip the lock of the converter will kill it pretty much instantly, it's not build for that so you have to have it unlocked.
I was interpreting "constant speed" as "zero speed difference between motor and drive train" which was probably a bit of a brain fart. You need that slippage to not stall the motor.