New driving mode needed, hint not conserve, but it conserves___________?

[Dark-Fx]

That part is correct for dual motor performance per RJ. On the quad motor I can only go by what service has told me more than once. That is that it's biased to the front motors in AP but will still use the others as needed. It also seems to make sense to me.

My intent on bringing this up was simply to say that trying to avoid tire wear is likely futile with these trucks.

It's irrelevant to this thread because there isn't a conserve mode in the dual motor trucks.

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[Electrified Outdoors]

Most EV manufactures have two different types of motors when they have dual motors. PMAC motors that the Quad motor Rivian has on every corner take energy to even rotate them without producing output torque. Tesla actually uses AC Induction motors up front so they don't have this disadvantage, and then only send power to the PMAC rear motors when the output demands are low.

PMAC are more efficient when being used but they can't freewheel like AC Induction motors do.

If the drive axle is decoupled from the motor? My understanding is that there is no "freewheeling" in that scenario.

I'm familiar with the differences between permanent magnet and induction.

 

[Electrified Outdoors]

It's irrelevant to this thread because there isn't a conserve mode in the dual motor trucks.

Fair enough. I was trying to say I mis spoke on that part ?

 

[Dark-Fx]

If the drive axle is decoupled from the motor? My understanding is that there is no "freewheeling" in that scenario.

That's conserve mode. All-Purpose in the Quad motor will not decouple the rear motors. The coupling design between quad and dual is very different. Quad has to rev and position match the coupler or it clunks. Dual motor just has to rev match (or at the very least has a much smaller angle of misalignment compared to what is in the quad) if I'm understanding the equipment Sandy is showing in the video.

 

[Electrified Outdoors]

That's conserve mode. All-Purpose in the Quad motor will not decouple the rear motors. The coupling design between quad and dual is very different. Quad has to rev and position match the coupler or it clunks. Dual motor just has to rev match (or at the very least has a much smaller angle of misalignment compared to what is in the quad) if I'm understanding the equipment Sandy is showing in the video.

Makes sense. I wish we had something like scanmytesla for the Rivian that would tell us exactly what the motors are doing.

Maybe they are gaining the efficiency over sport simply by changing how power/torque are delivered?

 

[brancky3]

I think the difference here is implementation. I have air suspension on my 45e, and on the highway, it automatically lowers the suspension. But I did not see any tire wear impact. I never rotated tires - they just did 36K and then I changed it. btw, 45e is a heavy car as well due to an additional 24 kW battery (5.5k lb).

Somehow BMW knew how to make geometry right, so it will be fine with any height.
In R1T they seem to cut the corners, and conserve mode just creates more problems than it solves.

Perhaps, but that's not what this thread was about from what I read. This is about conserve mode wearing front tires unevenly compared to the rear, which isn't an alignment issue. Conserve mode is only supposed to be used at highway speeds where you're not constantly slowing down (which is the culprit of premature front tire wear) or accelerating.

 

[NY_Rob]

Makes sense. I wish we had something like scanmytesla for the Rivian that would tell us exactly what the motors are doing.

Now that would be awesome. .take a look under the UI!
Even better, something equivalent to BimmerCode so we could make our own custom tweaks like I did on my i3

 

[shap]

Perhaps, but that's not what this thread was about from what I read. This is about conserve mode wearing front tires unevenly compared to the rear, which isn't an alignment issue. Conserve mode is only supposed to be used at highway speeds where you're not constantly slowing down (which is the culprit of premature front tire wear) or accelerating.

Actually, it is an alignment issue. In conserve mode, you will be automatically put in a low-height mode that will create an alignment issue and wear your tires. You can manually change the height to standard, but you need to do this manually.

The Rivian implementation of suspension is not optimal as while it has great options it does not compensate well for geometry changes.

 

[Greg Chick]

It's irrelevant to this thread because there isn't a conserve mode in the dual motor trucks.

I had no idea this was a 2 motor thread, excuse my quad motor assumptions.

 

[Electrified Outdoors]

I had no idea this was a 2 motor thread, excuse my quad motor assumptions.

I think that was directed at me. I clearly didn't have my coffee before I posted this morning ??‍

 

[Greg Chick]

“A significant issue” is a significant stretch. Would you also complain about a corvette burning through tires?

Brancky3. My choice of wording "Significant" is I didn't /don't think I drive like a Corvette, and I never thought any car could experience .166 cents per mile cost in tire wear. Either the rubber is soft for results in testing, or something, but the something is significant at this cost.

 

[Greg Chick]

I think that was directed at me. I clearly didn't have my coffee before I posted this morning ??‍
[/QUOTE

Or did I drink too much? in any case my R1T eats tires. I'm ok with say 17,000 miles, but 7,000 miles?

 

[MountainBikeDude]

All purpose is primarily front drive as well. Rear motor is completely locked out in conserve mode but in AP the rear motor turns off above 20 mph. The rear motor will engage again if requested power or low traction dictate...but mostly it's front wheel.

This isn't necessarily correct.

Quad motor:

All Purpose is 100% 4 motors all the time, regardless of speed. You only get 80% of the vehicles total power output. Sport unlocks the additional 20%.

Conserve is 2 motor, front wheel drive at all speeds. It's perfect for cruising at highway speeds, with gradual curves. Beyond that, accelerating from a stop with any haste, or sharp cornering at speed will increase front tire wear.

Dual Motor:

All Purpose has conserve mode blended in. Both front and rear motors propel the vehicle from a stop to 20mph, then the vehicle automatically disengages the rear motor, and becomes front motor dependent.

There is no way for a user to select Conserve mode in a Dual Motor vehicle.

 

[supernu8]

Getting back to the original point of the thread, I don't think a "tire conserve" mode would be any more useful than the existing all-purpose mode. I agree that there there should be a disclaimer on the drive mode page for Conserve mode that it could result in accelerated front tire wear if used exclusively. People using conserve to get around town are not likely conserving anything.

 

[eRacer]

Curious if any thought was made by Rivian to make a RWD/Conserve mode? Could double as a "street drift" mode or would it become the "widow maker" mode?

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