Dual Motor range estimate

[sg3707]

That quad motor still has untapped potential. Its power numbers could increase even more as per the teardown.

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[RYU]

I'm a pre-march res holder and I'm super interested in a dual R1S. I drive my R1T in Conserve all the time anyway. Some questions come to mind.

1. Are the quoted range figures (e.g. 328 miles on quad) in Conserve or All-purpose? I assume AP.

2. Safe to assume Conserve Mode in the dual means single motor/axle operation? Have we considered how much more range this could mean?

3. If the dual comes with hardware diff lockers I'd be all over it. Anyone hear anything about this or will Rivian use e-diffs, TQ vectoring or what not? I assume hardware diff locks are not ideal because all that torque could cause some real damage really quick.

I drive a lot. I also have other fun cars to scratch the go-fast bug. ~500HP/500lb-ft is more than enough for me and the quoted dual motor power figures are higher. It means more to me having a more efficient EV as this means less current but more importantly less charge times - a conversation for high mile commuters.

With the pre-march discount on the quad I fear it won't be worth the trade off in discounted pricing vs the added efficiency and less power.

 

[Goose]

Anyone have any guesses when the Youtubers will start to get the dual motor variants for "testing"?

 

[theyoungone]

Anyone have any guesses when the Youtubers will start to get the dual motor variants for "testing"?

Your guess is as good as mine ?

 

[mkg3]

....travel a lot so range is more of a concern for me than anything. The current 321 on the R1S is great but 355 or 360 mi at 8K cheaper would seal the freaking deal for me.

Since the power required to maintain cruise speed is a function of weight, drag and the rolling resistance, the only variable between the quad and dual is the drivetrain weight, if you assume the same battery capacity. In other words, the drag and the rolling resistance forces are the same regardless of motor count.

Also, power required at any given cruise speed is NOT maximum power. So the efficiencies of two motor vs four motors (actually single motor vs two motors, in conserve mode) will have some impact on range.

All that said, it is highly unlikely that you'd see 10%+ increase in range, given how small the variables are. The only way to get additional significant range increase is by either more batteries, different battery technology or both - given the same form factor of the vehicles.

The biggest difference between the two will show up during change of speed or any transient condition where quad's excess power will most likely have an advantage but in a steady state cruise conditions, probably never notice any differences.

 

[dleepnw]

I'm a pre-march res holder and I'm super interested in a dual R1S. I drive my R1T in Conserve all the time anyway. Some questions come to mind.

1. Are the quoted range figures (e.g. 328 miles on quad) in Conserve or All-purpose? I assume AP.

2. Safe to assume Conserve Mode in the dual means single motor/axle operation? Have we considered how much more range this could mean?

3. If the dual comes with hardware diff lockers I'd be all over it. Anyone hear anything about this or will Rivian use e-diffs, TQ vectoring or what not? I assume hardware diff locks are not ideal because all that torque could cause some real damage really quick.

I drive a lot. I also have other fun cars to scratch the go-fast bug. ~500HP/500lb-ft is more than enough for me and the quoted dual motor power figures are higher. It means more to me having a more efficient EV as this means less current but more importantly less charge times - a conversation for high mile commuters.

With the pre-march discount on the quad I fear it won't be worth the trade off in discounted pricing vs the added efficiency and less power.

sadly the dual motor will not have lockers (confirmed by Rivian Engineer) but it'll use braking across all 4 wheels to differentiate torque at each wheel to improve offroad capability. i imagine thats something similar to toyota's atrac system. so that'll be different obviously than the torque vectoring you can do with quad motors. i suspect there will be some cases where dual performs better offroad than the quad and vice versa. it'll be interesting to see the onroad differences between the dual and quad.
he also said they will be able to disconnect the rear motor to drive in conserve mode with only one motor so even more efficiency. send different amount of torque front/rear to improve driving capability.

 

[RYU]

sadly the dual motor will not have lockers (confirmed by Rivian Engineer) but it'll use braking across all 4 wheels to differentiate torque at each wheel to improve offroad capability. i imagine thats something similar to toyota's atrac system. so that'll be different obviously than the torque vectoring you can do with quad motors. i suspect there will be some cases where dual performs better offroad than the quad and vice versa. it'll be interesting to see the onroad differences between the dual and quad.
he also said they will be able to disconnect the rear motor to drive in conserve mode with only one motor so even more efficiency. send different amount of torque front/rear to improve driving capability.

Thanks for that info! I'm still an old school locker guy but i'm willing to change. I haven't had the opportunity to hit any major sketchy trails on my R1T yet but seeing videos of all that excess wheel spin and having a lack of throttle modulation (basically let the computer take control) will take a lot of getting use to. I had ATRAC on my Series 100 Lexus 570 and it works but I wasn't a huge fan.

Will keep an open mind. Thanks for confirming!

 

[Franksmartin]

In the end it electric motors moving a very heavy vehicle. There is only marginal improvement using conserve which in effect is cutting down to 2 motors that are smaller than the dual motors. So dual will likely have similar range to conserve on the 4 motor.

 

[theyoungone]

In the end it electric motors moving a very heavy vehicle. There is only marginal improvement using conserve which in effect is cutting down to 2 motors that are smaller than the dual motors. So dual will likely have similar range to conserve on the 4 motor.

Something similar. But even conserve is powered by two motors instead of 4. I’m really hoping 340-350 All-Purpose & 375-380 conserve.

 

[Franksmartin]

Unless

Something similar. But even conserve is powered by two motors instead of 4. I’m really hoping 340-350 All-Purpose & 375-380 conserve.

Unless it’s significantly lighter I’m not sure how it could be much better than where conserve is now.

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