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[RESOLVED] LEAVE-REGEN-ALONE

Why would regen decrease if the battery is cold? I’ve never had that happen to my Tesla - the only thing that affects the regen is the SOC and if it is 100% or somewhere close then it is obviously reduced, but the cold weather has never altered the regen strength.
 
Leftlane said:
Why would regen decrease if the battery is cold? I’ve never had that happen to my Tesla - the only thing that affects the regen is the SOC and if it is 100% or somewhere close then it is obviously reduced, but the cold weather has never altered the regen strength.
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It absolutely happens with Teslas and every other EV, though the temperature at which it becomes noticeable will vary with the specific battery chemistry and charger. For the same reason you precondition your battery prior to fast charging, a cold battery cannot physically accept as much power as a warm battery. If there's nowhere to put the energy, the motors can't take it away from the wheels.
 
Regen produces nowhere near the same amount of energy as a supercharger though. I don’t precondition to plug in my car at night for L2 charging either. I notice zero difference in regen strength when I start my drive in the mornings no matter how cold it is.
 
Leftlane said:
Regen produces nowhere near the same amount of energy as a supercharger though. I don’t precondition to plug in my car at night for L2 charging either. I notice zero difference in regen strength when I start my drive in the mornings no matter how cold it is.
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It's closer than you'd think. Regen in my AT can easily produce upwards of 80kW. You'll never see 350kW in the real world no, but it's significantly more power than even the 80A Lucid EVSE (80A * 240V = 19.2kW). It just doesn't usually last long. But the peak is exactly what you'd be talking about when suddenly taking your foot off the go pedal.
 
lucidtouringman said:
AFTER THE 2.8.16 UPDATE MY REGEN HAS CHANGED FOR THE WORSE AND I NEARLY REAR ENDED SOMEONE TODAY IN RAIN COS YOU HAVE TOLD MY BRAIN OVER THE LAST 2 YEARS THAT MY CAR WILL STOP IN X FEET....DO NOT ... DO NOT MESS WITH THE REGEN TO NOW NEED X+0.5X DISTANCE COS I NEARLY READ ENDED SOMEONE TODAY. IF I END UP IN A CRASH COS OF THIS, I WILL CALL MY LAWYERS. THIS IS A SAFETY ISSUE - FIX IT AND STOP MUCKING AROUND WITH REGEN!!!!
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I have not noticed much change in the regen over the 58,000 miles on my Air. It's probably a bit softer now. But, dude, you are the driver, be careful. What was your state of charge when the regen seemed weak? Near 100% charge the regen is intentionally reduced to protect the battery pack.
 
As many are reporting here, there has been no change in regen behavior in my car for many, many updates now. I’m fairly confident Lucid is not tweaking regen only for some cars randomly with each update.

Environment, along with driver perception shifting, is a much more logical explanation.
 
Regen is totally broken in my car and it's not a placebo nor is it the weather. It happened with 2.8.7 and has not been fixed by .9 or .16. I live in a warm climate and am getting practically non-existent regen when it's over 70 degrees outside. Car has never been charged above 80% since I bought it in June. Like OP, I've now had multiple panic braking incidents due to a severely decreased regen profile. In some cases I have even gotten the "reduced regen" message on the left side of the dash as if I've charged to 100% even though I might actually be at 77% when that message pops up.

I seriously doubt Lucid changed it on purpose because it would've been in the release notes and it would be experienced universally. It's just another bug.
 
The regen changing is not a perception or feel issue in my case I can confirm...there is a stop sign where I live and I have identified a spot over the last 2 years of driving on where I need to be driving a certain speed and then let off the accelerator pedal to stop the car right at the stop sign. I tried this three times earlier today and all three times I had the consistent low regen forcing me to put the mechanical brakes on. I am also a believer in data and I did this three times with the same result. So definitely not a perception issue and something has definitely changed through the last update
 
Leftlane said:
Regen produces nowhere near the same amount of energy as a supercharger though. I don’t precondition to plug in my car at night for L2 charging either. I notice zero difference in regen strength when I start my drive in the mornings no matter how cold it is.
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How fast does max regen stop the car from 60 mph? 10 seconds would require 100kw.
 
neuneleven said:
With all due respect and appreciation for all you do on the forum, Borski, It's not just physics in this case. I am one of those whose robust software change led to a post software change in the preprogrammed regenerative deceleration, a few updates back when it was not cold. I just chalked it up to the update and adjusted my driving after a couple of longer than usual stops and did not give it a second thought. I expect things change with updates, heck I was used to my dashboard and display changing from one hour to another with some of the Rivian updates. At least, they did inform one of the upcoming changes and what to expect. I'm not knocking your point down or trying to be contrarian. It did indeed change post update from one drive to another and has remained that way since - and the weather had not changed before to after the update!
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I believe that you had that experience. I would be surprised if Lucid suddenly decided to change the regen behavior for only some vehicles, without mentioning it in the release notes. Is it possible? Certainly. I don’t think it’s likely, but it’s definitely possible.

It’s also possible that there was something that changed with your vehicle, or that there is a bug, or it looks like it’s set to high regen but is actually set to low… who knows. Lots of things can be the culprit.

It is just my opinion, to be clear, that Lucid releasing an OTA to intentionally change the regen behavior on only a few vehicles in the fleet seems very unlikely.

But that’s all it is - an opinion.
 
Solomente said:
Regen is totally broken in my car and it's not a placebo nor is it the weather. It happened with 2.8.7 and has not been fixed by .9 or .16. I live in a warm climate and am getting practically non-existent regen when it's over 70 degrees outside. Car has never been charged above 80% since I bought it in June. Like OP, I've now had multiple panic braking incidents due to a severely decreased regen profile. In some cases I have even gotten the "reduced regen" message on the left side of the dash as if I've charged to 100% even though I might actually be at 77% when that message pops up.

I seriously doubt Lucid changed it on purpose because it would've been in the release notes and it would be experienced universally. It's just another bug.
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You should have your car checked out by service, in my opinion. That doesn’t sound like a software bug.
 
lucidtouringman said:
The regen changing is not a perception or feel issue in my case I can confirm...there is a stop sign where I live and I have identified a spot over the last 2 years of driving on where I need to be driving a certain speed and then let off the accelerator pedal to stop the car right at the stop sign. I tried this three times earlier today and all three times I had the consistent low regen forcing me to put the mechanical brakes on. I am also a believer in data and I did this three times with the same result. So definitely not a perception issue and something has definitely changed through the last update
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Hold on, I’m not trying to suggest anyone is making it up or it’s a perception issue. I’m only suggesting that it may have more to do with environment, tire wear, etc., not that anyone is lying or delusional.
 
borski said:
Hold on, I’m not trying to suggest anyone is making it up or it’s a perception issue. I’m only suggesting that it may have more to do with environment, tire wear, etc., not that anyone is lying or delusional.
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There may some impact from weather but the most likely culprit IMO, given the history of the software in this car, is an unintentional bug. It's definitely not an intentional change by Lucid.
 
borski said:
Hold on, I’m not trying to suggest anyone is making it up or it’s a perception issue. I’m only suggesting that it may have more to do with environment, tire wear, etc., not that anyone is lying or delusional.
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My post wasn't directed at you..it was in general an experiment result I wanted to share with the larger group..if I wanted to direct it at anyone I'd quote their post as well...I understand the point you're making...
 
I just wanted to add another data point to this thread. Since the last update, I've also noticed a change in region behavior in my AT. In my daily commute and regular driving,. I almost never use the friction brakes. That changed since the last update and I was surprised that I had to make sudden stops using the friction brakes multiple times since I expected the region to stop the car as I normally do.

I'm very used to my AT's region stopping distance in High Regen mode and have trained my driving style to match. Thus, I've had no need for the friction brakes for a long while now. After the update, when I expect the car to come to a stop (e.g., behind another car), I now notice the car continue to roll forward rather than halting forcing me to use the friction brakes. I have never needed to do that before in normal driving.

I've now begun to "recalibrate" my driving style to release the accelerator early to initiate regeneration perhaps 10 feet earlier than I normally would. It's annoying.
 
I've never had to use the brake pedal before the last update. I've been happily one pedal- driving for over 3 years. Now I have to hover over the brake pedal when nearing a stop. As I said before, I only use Smooth mode and high regen.

Yes I do use the brake pedal when the battery is full or nearly so, which is rare as I only fully charge when starting on a long trip. Otherwise I set to 80%.

But I admit I could be wrong. I only posted about this when others posted the same observation. Polar Vortex is here so I'm going out in the sub-freezing weather now to test the physics.
 
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