So Beast Mode is Basically Pointless for $20k more

[SSonnentag]

No it's not, because it can't have a true locking diff on the rear, it is software controlled. It's not the same and has been proven that the awd is better offload than the tri motor.

I'd like to see the proof. I tend to agree with you, but haven't seen any testing that proves it yet.

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[HaulingAss]

No it's not, because it can't have a true locking diff on the rear, it is software controlled. It's not the same and has been proven that the awd is better offload than the tri motor.

I must have missed that proof. I think it's still an open question until the two go head-to-head in appropriate conditions. Even if the Beast loses the battle, it could prbably be fixed with a software update.

 

[Haoooc]

I like to understand from technically point of view, how does a diff locker better than 2 spectate motors? Assume Tesla software works well, or it even let users to manually control each motor.

 

[Stuck4ger]

I must have missed that proof. I think it's still an open question until the two go head-to-head in appropriate conditions. Even if the Beast loses the battle, it could prbably be fixed with a software update.

My thought, too. Just because a reviewer said the AWD functioned better 2 months ago doesn’t mean it will function better after the next OTA as I am pretty sure the beast’s capabilities are still being tweaked.

 

[SSonnentag]

Tesla should investigate applying torque to each rear wheel based upon how much suspension compression there is on each wheel. Equal compression, equal torque. More compression on one wheel vs. the other, the compressed side gets more torque. Seems like a simple solution.

It might even work fairly well in open differential situations where a brake is applied to the wheel with the less suspension compression.

This idea seems like it would avoid all of the delays present in current traction control systems where they have to wait for one wheel to spin faster than the other before clamping down (or reducing torque) on the spinning wheel.

 

[CyberRoo!]

It's a bit more exclusive and some people love the increased performance. If it fits your budget and you enjoy the performance - get the Beast! I love the performance of my Beast and Plaid and think these halo vehicles are second to none!

 

[HaulingAss]

Tesla should investigate applying torque to each rear wheel based upon how much suspension compression there is on each wheel. Equal compression, equal torque. More compression on one wheel vs. the other, the compressed side gets more torque. Seems like a simple solution.

It might even work fairly well in open differential situations where a brake is applied to the wheel with the less suspension compression.

This idea seems like it would avoid all of the delays present in current traction control systems where they have to wait for one wheel to spin faster than the other before clamping down (or reducing torque) on the spinning wheel.

That sounds like a workable good idea. And, indeed, Tesla may already be doing it for all we know.

I don't think it makes sense to use it to apply the brake as a matter of course in a vehicle with an open differential except in special off-road modes due to the hit in efficiency. In normal on-road modes it would still have to wait for the wheel to slip before applying the brake. But, keep in mind, traction control systems have a reaction speed measured in microseconds, and they continually get faster and resolutions (degrees of wheel rotation) keep getting smaller. No human can outperform them, even if they had access to a dedicated throttle and brake for each wheel.

In the rear axle of the Beast, it could be applied as a left/right torque bias based upon relative compression of each suspension unit. There would still be the underlying traction control based on wheel slippage that would kick in instantly, as soon as wheel slip was detected, to take care of situations where one tire is on a lower traction surface than the other.

If they wanted to get fancy, they could make it a dynamic system, meaning it would understand that a more rapid compression of a suspension unit meant there would shortly be a lot of weight on the associated wheel and torque could be increased. Conversely for the opposite motion. Of course, it might be better to use a combination of the suspension position sensor combined with the instantaneous pnumatic pressure reading of each suspension unit (rather than the rate of change of the suspension position sensor).

 

[mongo]

AWD with rear locked: The motor must be controlled to limit torque to below what a single tire (grippiest) can transfer to the ground

Beast: For each side, the motor must be controlled to limit torque to what a single tire can transfer to the ground

The only case in which AWD would be better is if it has more torque than a single Beast motor AND a single tire could actually transfer all of it to the ground.
Outside that unlikely situation, the ability to have each tire rotate at a different speed means less stress and understeer when moving in anything other than a straight line.

The use of different motor types between AWD and Beast can have an impact on traction control dynamics, but that is highly software implementation dependent.

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