Quad Motor Better Than Lockers...?

[JeremyP]

A low range would help overcome the problem of the motors stalling on an obstacle. A traditional 4x4 can also experience the same thing if you leave it in high range and are up against a large enough obstacle. A coupler that could connect the left/right motors could act as a locker. Both these options would add complexity and cost though, the opposite of what Rivian has been working on.

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[Kelvn]

Anything is possible with money. I believe the QM motors on the same axle share a common point in the bearing or bearing housing somewhere. Basically where they sit next to each other. A redesign could add a coupler there, but not without lots of design $.

 

[R1TCntrlMaIzzy]

It would be pretty cool if they "fixed it".

But even the verbiage of their claim leaves me with significant doubt... ?

So, when will you buy a Gen2 T QM to test with?

 

[R.I.P.]

So, when will you buy a Gen2 T QM to test with?

My Sierra Denali EV is scheduled for production the 15th of July.

The R1's have been a fun test, but a week with a Silverado RST EV really puts GM's experience in truck building into sharp relief with the companies that are just getting started.

With GM building a full sized truck that is a better fit for the hords of "truck people" in the market, it takes a huge bite out of the potential market for Rivian. It relegates it to a niche vehicle, mostly competing against smaller sport trucks such as the Raptor: except it is not competitive off road. And no, the lack of a differential in the QM/TM variants is not the only thing that puts the vehicle at a disadvantage once the pavement ends. The vehicle's weight and relatively fragile suspension means it will never measure up to the Jeeps and Broncos in the rough stuff.

There is a place for the vehicle, no doubt, but at least for this old redskin, I will trading it for a good 'ol GMC the minute the new rig hits the dealer's lot.

 

[R1Tom]

My Sierra Denali EV is scheduled for production the 15th of July.

The R1's have been a fun test, but a week with a Silverado RST EV really puts GM's experience in truck building into sharp relief with the companies that are just getting started.

With GM building a full sized truck that is a better fit for the hords of "truck people" in the market, it takes a huge bite out of the potential market for Rivian. It relegates it to a niche vehicle, mostly competing against smaller sport trucks such as the Raptor: except it is not competitive off road. And no, the lack of a differential in the QM/TM variants is not the only thing that puts the vehicle at a disadvantage once the pavement ends. The vehicle's weight and relatively fragile suspension means it will never measure up to the Jeeps and Broncos in the rough stuff.

There is a place for the vehicle, no doubt, but at least for this old redskin, I will trading it for a good 'ol GMC the minute the new rig hits the dealer's lot.

Stop back in after a while and let us know how the GMC is doing. Probably not a vehicle that would interest me for a variety of reasons, but still curious what your take is on it after 10k miles, etc...

 

[R.I.P.]

Stop back in after a while and let us know how the GMC is doing. Probably nit a vehicle that would interest me for a variety of reasons, but still curious what your take is on it after 10k miles, etc...

Ok, will do.

Obviously the Denali will _not_ be used/tested as an off-roader. It will be used as the tow/support rig. I'm looking forward to getting back to a full size pickup bed, as well as the ability to run a 240 volt welder off the substantial pack the GMC comes with.

But first order of business, get rid of those ridiculous 24-in wheels the truck comes on... Ugg...

 

[R1Tom]

Ok, will do.

Obviously the Denali will _not_ be used/tested as an off-roader. It will be used as the tow/support rig. I'm looking forward to getting back to a full size pickup bed, as well as the ability to run a 240 volt welder off the substantial pack the GMC comes with.

But first order of business, get rid of those ridiculous 24-in wheels the truck comes on... Ugg...

I don't use mine off road anyway....that is what the Jeeps are for. It's a fun daily driver.

I saw a GMC at a local car show a week or so ago. Looks very nice and I am sure you will enjoy it!

 

[usulio]

I read this debate in the other thread a while back and it does seem like there are very real situations where the QM falters. My question for people here: which of the various solutions proposed would be best? Physical lockers would be great, but is it even possible, let alone practical, with a QM set up? Or would a digital locker set up from a crawl control keeping all wheels spinning the same be good enough? What about a low range gear like someone said Stellantis is doing? Do any of these even solve the issues of low stall torque and motor overheating?

Essentially, if you were designing the top of the range Rivian, what would be your order of changes to make it better in the most practical way?

I'm no expert, but it seems to me that a dual motor with physical lockers would be a great solution. Not as good at the track or in rally mode, of course. I assume that Rivian's software is already trying to mimick a digital locker or crawl control, and probably doing well at it.

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