alohart
Posts: 2432
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: i3 s regenerative breaking

Thu Sep 13, 2018 12:45 pm

Bluei3s wrote:You mentioned that Regen isn't strong even in eco-pro+, I will say that I haven't noticed any difference at all across the driving modes.
I haven't noticed that driving mode makes any difference in regen power in our 2014 BEV, so my observation agrees with yours.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

EVMan
Posts: 340
Joined: Sat Feb 25, 2017 4:31 pm
Location: USA, DC

Re: i3 s regenerative breaking

Thu Sep 13, 2018 8:32 pm

i3Houston wrote:I thought it would be weight but looks like there is not a huge difference.

2017 BMW i3/Curb weight - 2,799 to 3,234 lbs

2014 BMW i3/Curb weight - 2,799 to 3,064 lbs

Potentially BMW reduced it for some reason. :roll:
Yes, they likely reduced, and not bothered to provide the stetting in the menu. Hopefully coding should fix this issue
2017 33KWH Rex
Model 3 Long Range
Solar ToU Plan
DC USA

frictioncircle
Posts: 152
Joined: Fri Nov 25, 2016 11:23 pm
Location: USA West Coast

Re: i3 s regenerative breaking

Fri Sep 14, 2018 10:24 pm

I have a 2014 BEV (April 2014 production) and couldn't believe BMW's curb weight claims were real.

In frustration, I took my i3 to a local truck scale. With zero persons in the car – and perhaps 40 lbs. (max) of detritus in the car, I got an empty weight of 2,880 lbs. (1306 kg).

alohart
Posts: 2432
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: i3 s regenerative breaking

Sat Sep 15, 2018 11:05 am

frictioncircle wrote:In frustration, I took my i3 to a local truck scale. With zero persons in the car – and perhaps 40 lbs. (max) of detritus in the car, I got an empty weight of 2,880 lbs. (1306 kg).
I should do the same with our August, 2014, BEV.

The listed curb weight is likely for the lightest version with no options (i.e., the lightest 19" pizza slice wheels, 5" rear wheels with 155 mm tires, no DCFC, only 3.7 kW AC charging, no heat pump, no burglar alarm, base entertainment system, no Comfort Access, base cloth interior, no rear camera, no front ultrasound parking sensors, etc.). All U.S. BEV's were delivered with 7.4 kW AC charging (i.e., with a KLE module that's missing in the 3.7 kW AC charging version), a heat pump, and a burglar alarm, so no U.S. BEV is likely as light as 2,634 lb.
Last edited by alohart on Sat Sep 15, 2018 10:27 pm, edited 2 times in total.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

bwilson4web
Posts: 778
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: i3 s regenerative breaking

Sat Sep 15, 2018 5:13 pm

My regenerative braking is breaking every time I shift into "N".

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

Ash347
Posts: 1
Joined: Wed Jan 01, 2020 8:14 am

Re: i3 s regenerative breaking

Wed Jan 01, 2020 8:59 am

Hi all - I just bought a 2018 i3s. I drove it home from pick up and the regen breaking worked fine and was predictable. I’d say possibly a little harsher in response that felt comfortable but I’d have got used to it for sure.

Then I get in the car for my next journey after registering it online. Regenerative breaking has all but disappeared! Yes it’s smoother - but I have to use the breaks all the time now. It’s clearly some form of firmware update.

Very frustrating. I LOVE this car but I want to control the level of regenerative breaking according to my own needs please BMW!

Any tips on what to do to get my regen breaking back gratefully received!

Cheers all

Ashley

alohart
Posts: 2432
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: i3 s regenerative breaking

Wed Jan 01, 2020 4:14 pm

Ash347 wrote:
Wed Jan 01, 2020 8:59 am
Then I get in the car for my next journey after registering it online. Regenerative breaking has all but disappeared! Yes it’s smoother - but I have to use the breaks all the time now. It’s clearly some form of firmware update.
Almost certain that a software update was not applied because BMW has not been updating an i3's system software wirelessly. However, you could check the current system software version by saving your driver profiles to a USB drive using an iDrive command, inserting this USB drive into a computer, opening a profile file ("mpd" file extension) in a text editor, and noting the value of the "<i-step>" tag. For our i3:

<i-step>I001-18-11-520</i-step>

The version year is indicated by the second field with the month, the third field (November, 2018 for our i3). If the software version on your i3 is late 2019, a wireless update might have occurred.

More likely would be a low battery pack temperature which results in limited regenerative power until the pack temperature rises.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

Borgeje
Posts: 1
Joined: Sun Feb 02, 2020 5:12 am

Re: i3 s regenerative breaking

Sun Feb 02, 2020 5:20 am

Hi

I just bought a 2015 i3 with Rex and received it last Tuesday (28-jan). Regen breaks were working great and predictable. Since Saturday they are varying a lot while decelerating the car, and what tells me it’s not “normal” versus the first days I had it it’s that the regen breaks until a certain point and the car doesn’t fully stop - I understand the normal breaks should be applied at that point. So basically I need now to pay attention to avoid slowly hitting the driver ahead of me even.
I believe there is no “wireless” software update but it almost feels like that. Anybody else with similar situation or with recommendations?

Thanks

Arm
Posts: 103
Joined: Tue Jan 07, 2020 5:53 pm

Re: i3 s regenerative breaking

Mon Feb 03, 2020 11:38 am

2019 i3S owner with ReX.

No issues with regen...it's quite aggressive and very predictable for me. But then again, I've been driving EVs now for over 5 years....2014 Spark EV, 2017 Volt, 2017 i3, and now a 2019 i3s.

Now I can't drive a regular car normally...using brakes is really annoying.

Arm
Posts: 103
Joined: Tue Jan 07, 2020 5:53 pm

Re: i3 s regenerative breaking

Mon Feb 03, 2020 11:39 am

alohart wrote:
Wed Jan 01, 2020 4:14 pm
Ash347 wrote:
Wed Jan 01, 2020 8:59 am
Then I get in the car for my next journey after registering it online. Regenerative breaking has all but disappeared! Yes it’s smoother - but I have to use the breaks all the time now. It’s clearly some form of firmware update.
Almost certain that a software update was not applied because BMW has not been updating an i3's system software wirelessly. However, you could check the current system software version by saving your driver profiles to a USB drive using an iDrive command, inserting this USB drive into a computer, opening a profile file ("mpd" file extension) in a text editor, and noting the value of the "<i-step>" tag. For our i3:

<i-step>I001-18-11-520</i-step>

The version year is indicated by the second field with the month, the third field (November, 2018 for our i3). If the software version on your i3 is late 2019, a wireless update might have occurred.

More likely would be a low battery pack temperature which results in limited regenerative power until the pack temperature rises.
I thought over the air updates are now included? Seems to be with my vehicle.

Also, yes if your car is fully charged and you start downhill initially like I do from my home, regen is very light and it's all brakes when applying the brake pedal.

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