Dual Motor All Purpose not smooth now

[Jonger1150]

I'm running mine in snow mode, I'm worried that it's going to damage the motor.

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[-0—poody—0-]

I have a 2024 DM R1T and I noticed this behavior after the most recent software update. There is a noticeable clunk or jolt when the rear motor kicks in while in AP mode. Glad to know that this is a known issue and not just my vehicle. I was considering a service request to have it looked at. The engagement was previously barely noticeable. Hopefully, they are able to correct it with a future update.

 

[teartags]

It's not you. 2023 Dual Large here and after a road trip this weekend I definitely notice a clunk when the rear motor engages. Seems like the rear is engaging a lot more frequently, but that might be because I was paying more attention to it after feeling the clunk.

 

[2kwik4u]

Since 2024.51.01 was released on Gen 1 Dual Motor performance, I have noticed that all purpose engages the rear Motor much more abruptly.

I'm trying to decipher whether I'm having an issue or not.

About 2 weeks ago just before the 2024.51.01 update, I had a turtle mode error and the rear Motor was disabled. I did a reset and it cleared the error and everything seemed to be OK. The update came out the next day, making it tough to pin this on software or timing.

I notice when on the highway at 60+ mph, when in all-purpose.... there is a bit of a thump when the rear Motor engages under higher throttle. I don't remember this before.

If I'm driving in all purpose and engage Snow Mode, the thump hits when the Motor engages. So it's clearly the engagement of the Motor. This all happened right around the update and that turtle mode/rear Motor disengagement.

Sound familiar to anyone else? Has anyone noticed a difference after the update? I posted a similar thread on this before but I didn't word it right or mention the Dual Motor.

Mine has been this way since delivery in September. I've got a '24 Dual Motor (non-performance) Large pack. I have "felt" the engagement of the rear drive unit since new. In particular, large pedal position changes on the interstate will trigger the feeling the most. Slow/low speed stuff around town (under 55mph, and with small pedal position changes) it's really well disguised. Really the only time it's annoying is when there is a lot of "speed up-slow down" style traffic on the interstate, OR, when I "punch it" to pass someone. I can feel the engagement very clearly then.

Still better than the "wait for power to come on" in my ICE drivelines with multi-speed transmissions.

The Gen 1 Quad R1S loaner I drove for a week had none of that issue, even in conserve mode (not sure if there is a mechanical clutch on the quads to even feel to be honest).

 

[Jonger1150]

Mine has been this way since delivery in September. I've got a '24 Dual Motor (non-performance) Large pack. I have "felt" the engagement of the rear drive unit since new. In particular, large pedal position changes on the interstate will trigger the feeling the most. Slow/low speed stuff around town (under 55mph, and with small pedal position changes) it's really well disguised. Really the only time it's annoying is when there is a lot of "speed up-slow down" style traffic on the interstate, OR, when I "punch it" to pass someone. I can feel the engagement very clearly then.

Still better than the "wait for power to come on" in my ICE drivelines with multi-speed transmissions.

The Gen 1 Quad R1S loaner I drove for a week had none of that issue, even in conserve mode (not sure if there is a mechanical clutch on the quads to even feel to be honest).

Does it feel even worse now after the recent update?

I just got to work and I used snow mode..... I can't tolerate all purpose now. It was perfect 3 weeks ago -- for me.

 

[Der]

Since 2024.51.01 was released on Gen 1 Dual Motor performance, I have noticed that all purpose engages the rear Motor much more abruptly.

I'm trying to decipher whether I'm having an issue or not.

About 2 weeks ago just before the 2024.51.01 update, I had a turtle mode error and the rear Motor was disabled. I did a reset and it cleared the error and everything seemed to be OK. The update came out the next day, making it tough to pin this on software or timing.

I notice when on the highway at 60+ mph, when in all-purpose.... there is a bit of a thump when the rear Motor engages under higher throttle. I don't remember this before.

If I'm driving in all purpose and engage Snow Mode, the thump hits when the Motor engages. So it's clearly the engagement of the Motor. This all happened right around the update and that turtle mode/rear Motor disengagement.

Sound familiar to anyone else? Has anyone noticed a difference after the update? I posted a similar thread on this before but I didn't word it right or mention the Dual Motor.

I have Gen 1 DM and have not noticed this. I’m going to pay more attention and see if I notice anything.

 

[Jonger1150]

I have Gen 1 DM and have not noticed this. I’m going to pay more attention and see if I notice anything.

You can easily replicate it.

While on the highway, toggle between All Purpose and Snow mode under throttle.

 

[Mathme]

Sounds like this is a new development with the DMs and some people have made appointments to have this looked at.

My recommendation is: if you have a DM and you have noticed this new behavior change, open a ticket with service. The more people who do this shows Rivian that this is a broader issue and will thus get them to look at it sooner/ take it more seriously.

On a side note, this driveline clunk is one of the reasons why I rarely use Conserve in my Gen 1 Quad....it just sounds like at some point something is going to give back there (and not in a good way).

 

[2kwik4u]

Does it feel even worse now after the recent update?

I just got to work and I used snow mode..... I can't tolerate all purpose now. It was perfect 3 weeks ago -- for me.

Nope, feels the same as before. It's always been a noticeable engagement. Like above though, it's only ever really noticeable with significant pedal changes. Large changes in requested power will give a "bump" on lockup. I can watch the rear "unlock" around 38-42mph pretty consistently. Anything over that speed, AND over ~25% change in pedal position will generate the feeling.

Similar, but less aggressive, feeling to the clutch locking in the transfer case of an "auto 4wd" GM fullsize pickup/SUV. It's essentially the same mechanism, an electronically controlled physical clutch to engage/disengage a driveline. Without "slipping" that clutch at some level, you'll always have "some" engagement feel to it. The ability to perfectly sync wheel speed to driveline speed before engagement would take longer than just locking "on the way up" in speed. This delay is likely less favorable to just feeling the lockup.

I suspect either the clutch engagement was changed as part of the "Improved drivability" in the last update (although I thought was only for reverse), OR, it's placebo effect and those of you with problems are just now noticing because you're hyper aware of it. Gut tells me it's more placebo than changed software.

It's interesting that many are now living in snow mode. I made a post on reddit about using that as an option to keep AWD engaged, and was met with pretty strong backlash about the pedal response tuning being "too numb" in that mode. I honestly can't tell much difference in pedal calibration between the two modes.

 

[naninanipoopoo]

Since 2024.51.01 was released on Gen 1 Dual Motor performance, I have noticed that all purpose engages the rear Motor much more abruptly.

I'm trying to decipher whether I'm having an issue or not.

About 2 weeks ago just before the 2024.51.01 update, I had a turtle mode error and the rear Motor was disabled. I did a reset and it cleared the error and everything seemed to be OK. The update came out the next day, making it tough to pin this on software or timing.

I notice when on the highway at 60+ mph, when in all-purpose.... there is a bit of a thump when the rear Motor engages under higher throttle. I don't remember this before.

If I'm driving in all purpose and engage Snow Mode, the thump hits when the Motor engages. So it's clearly the engagement of the Motor. This all happened right around the update and that turtle mode/rear Motor disengagement.

Sound familiar to anyone else? Has anyone noticed a difference after the update? I posted a similar thread on this before but I didn't word it right or mention the Dual Motor.

It is not just you, I'm certain. When I contacted Mobile Customer Service with the drive train issue and the appearance of several telltales, they suggested soft and hard reserts, with the same results as you experienced. But CS set me up for an appointment and then just yesterday I noticed all telltales were gone, as was the drive train issue. Whether the R1T dual motor corrected itself or CS was responsible, I was impressed. I will monitor for the time that remains before my service appointment, but expect the service appointment will be unnecessary.

 

[Jonger1150]

Nope, feels the same as before. It's always been a noticeable engagement. Like above though, it's only ever really noticeable with significant pedal changes. Large changes in requested power will give a "bump" on lockup. I can watch the rear "unlock" around 38-42mph pretty consistently. Anything over that speed, AND over ~25% change in pedal position will generate the feeling.

Similar, but less aggressive, feeling to the clutch locking in the transfer case of an "auto 4wd" GM fullsize pickup/SUV. It's essentially the same mechanism, an electronically controlled physical clutch to engage/disengage a driveline. Without "slipping" that clutch at some level, you'll always have "some" engagement feel to it. The ability to perfectly sync wheel speed to driveline speed before engagement would take longer than just locking "on the way up" in speed. This delay is likely less favorable to just feeling the lockup.

I suspect either the clutch engagement was changed as part of the "Improved drivability" in the last update (although I thought was only for reverse), OR, it's placebo effect and those of you with problems are just now noticing because you're hyper aware of it. Gut tells me it's more placebo than changed software.

It's interesting that many are now living in snow mode. I made a post on reddit about using that as an option to keep AWD engaged, and was met with pretty strong backlash about the pedal response tuning being "too numb" in that mode. I honestly can't tell much difference in pedal calibration between the two modes.

It's not a placebo, it happened the first day after the update came out.

 

[cevans]

Same here for this behavior after the latest update. Highway trips through the mountains are pretty jarring now. I do the same trip all the time and the difference is big.

 

[HaveBlue]

Since 2024.51.01 was released on Gen 1 Dual Motor performance, I have noticed that all purpose engages the rear Motor much more abruptly.

I'm trying to decipher whether I'm having an issue or not.

About 2 weeks ago just before the 2024.51.01 update, I had a turtle mode error and the rear Motor was disabled. I did a reset and it cleared the error and everything seemed to be OK. The update came out the next day, making it tough to pin this on software or timing.

I notice when on the highway at 60+ mph, when in all-purpose.... there is a bit of a thump when the rear Motor engages under higher throttle. I don't remember this before.

If I'm driving in all purpose and engage Snow Mode, the thump hits when the Motor engages. So it's clearly the engagement of the Motor. This all happened right around the update and that turtle mode/rear Motor disengagement.

Sound familiar to anyone else? Has anyone noticed a difference after the update? I posted a similar thread on this before but I didn't word it right or mention the Dual Motor.

I had the same event coming away from a stoplight that turned green while I was still moving. Service said they recalibrated the rear motor disconnect position sensor. Even though Turtle Mode went away after a sleep cycle, I think the timing tolerance was a bit close and the clutches shifting too slow. 51 must have been an overall fix by having the clutch switch quicker.

The dual has a different disconnect than the quad.

If you are in a scenario where it is cycling a lot, change to low stability mode.

 

[2kwik4u]

It's not a placebo, it happened the first day after the update came out.

I went and drove around at lunch, trying to see how it felt.

I'll conceded that it's "different", in that it feels like a timing issue moreso now than a mechanical issue. Previously it was a very distinct "engage" feeling. Now it's like it engages, then feeds power. So there is almost a "2-Step" feeling to it.

I still didn't notice it without trying to make it happen. In just normal smooth driving it's near imperceptible to me.

 

[Jonger1150]

I had the same event coming away from a stoplight that turned green while I was still moving. Service said they recalibrated the rear motor disconnect position sensor. Even though Turtle Mode went away after a sleep cycle, I think the timing tolerance was a bit close and the clutches shifting too slow. 51 must have been an overall fix by having the clutch switch quicker.

The dual has a different disconnect than the quad.

If you are in a scenario where it is cycling a lot, change to low stability mode.

I went and drove around at lunch, trying to see how it felt.

I'll conceded that it's "different", in that it feels like a timing issue moreso now than a mechanical issue. Previously it was a very distinct "engage" feeling. Now it's like it engages, then feeds power. So there is almost a "2-Step" feeling to it.

I still didn't notice it without trying to make it happen. In just normal smooth driving it's near imperceptible to me.

The rear motor needs less power at engagement, it's too much and it's causing a slam. There's no way this is good for the motor.

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