electruck
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- 2023 Rivian R1S
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Perfect! I think that is the answer!
The Rivian gear stalk should be functionally identical to that in the Model 3/Y.Perfect! I think that is the answer!
But isn’t that what a differential does? It sends almost all power to only one wheel, which is why you don’t tear up your tires when you take sharp corners on a solid surface. It’s true if you lift both wheels off the ground, they should both turn. But that’s just because of the friction inside the drivetrain causing that isn’t it? Your ice scenario was a perfect example of what I was picturing for a conventional drivetrain. Only one wheel should spin…AFAIK, that isn't how physics work -- even with 2WD. In normal conditions, where both driven wheels have equal traction, power does go through BOTH wheels. If one wheel has significantly less traction (which makes it much easier to spin) then power causes that wheel to spin and not the wheel with all the traction. Torque is a bit like electricity, in that regard -- it takes any and all paths available to it.
Now before someone says "but wait, doesn't electricity take the path of LEAST resistance?" NO! That is a myth. Electricity takes ALL paths. However, the path with higher RESISTANCE will take less current. Now consider the 2WD vehicle. The traction between the tire and road is resistance. Drivetrain "power" is current. The wheel with higher traction (resistance) will transfer (flow) less power (current). The larger the difference in traction (resistance) between the driven wheels, the larger the difference in how much power transmits through each wheel. Make the difference large enough (like one wheel on a patch of ice) and there may not be enough power to spin the wheel with traction and effectively you get the wheel without traction just spinning.
Limited-Slip Differentials (Posi-track is one such trademark) are useful in those situations because they force at least some power (varies depending on implementation) to the wheel with traction. In normal driving, however, an "open" differential is fine and does "turn" both wheels.
Thanks! I googled it last night and saw the same explanation. That also makes sense! 60mph behind an RV or towtruck would definitely cause some damage.There is no physical disconnect for the motors. If the vehicle is off the cooling systems are also off, which will lead to a heat buildup in the motors and eventual failure. Jeeps can be flat towed because they have physical disconnects. If you forget to do those you're going to ruin something.
My best guess is that they send just enough power to the rear wheels to overcome the drag, but not enough to produce propulsion.How do they put the car into 2WD and not burn up the back motors though? Shouldn’t it have the same effect driving down the highway in 2WD?
Not exactly. The differential allows power to flow to both wheels on the axle. You don't tear up tires when taking corners with an open differential because the two sides of the differential are allowed to rotate as different speeds. Even though the outside wheel travels a little bit faster than the inside wheel, power will still go to both wheels if they both have traction.But isn’t that what a differential does? It sends almost all power to only one wheel, which is why you don’t tear up your tires when you take sharp corners on a solid surface. It’s true if you lift both wheels off the ground, they should both turn. But that’s just because of the friction inside the drivetrain causing that isn’t it? Your ice scenario was a perfect example of what I was picturing for a conventional drivetrain. Only one wheel should spin…
Lol! I love those old demonstration movies! Very good video to teach how it all works. I remember my auto shop teacher telling us open diff cars were actually 1WD. Now I know I’ve been spreading wrong information so thank you for the clarification!Not exactly. The differential allows power to flow to both wheels on the axle. You don't tear up tires when taking corners with an open differential because the two sides of the differential are allowed to rotate as different speeds. Even though the outside wheel travels a little bit faster than the inside wheel, power will still go to both wheels if they both have traction.
This video has an excellent visual demonstration.
My Tesla has the car wash mode....but I'd never take it into auto wash. After seeing the first Tesla in the 'hood and looking at my neighbor's Tesla paint fade and swirl after ONE car wash, I decided to continue hand washing every car as I've done since parting ways with my college junker.I have a model Y and it will absolutely not go through a car wash in drive, unless I apply some perssure on the pedal which would scare the "P" out of me to do. Tesla announced recently that they enabled a car wash mode. I have not received the update that has this feature, but the Tesla you saw may have received the beta update.
I'm convinced that old informational videos from the 30's to 50's are better than almost every modern textbook and video. They really did put a lot of effort into them and they're fantastic. There was another video that explained transmissions with "spinning levers" and I strongly suggest that to anyone who likes those types of videos or wants to know the basics of a transmission.Lol! I love those old demonstration movies! Very good video to teach how it all works. I remember my auto shop teacher telling us open diff cars were actually 1WD. Now I know I’ve been spreading wrong information so thank you for the clarification!
Tim Hunkin’s “The Secret Life of Machines” is an excellent seriesI'm convinced that old informational videos from the 30's to 50's are better than almost every modern textbook and video. They really did put a lot of effort into them and they're fantastic. There was another video that explained transmissions with "spinning levers" and I strongly suggest that to anyone who likes those types of videos or wants to know the basics of a transmission.