BMW i
Forum for the BMW i3, i4 and i8
BMW i3 BMW i8
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

  BMW i Forums > BMW i8 Forums > BMW i8 General Discussion

Post Reply
 
Thread Tools Search this Thread
      07-09-2015, 07:01 PM   #23
YWGT3
iDriver
United_States
350
Rep
580
Posts

Drives: BMW i8 & 650GC, Taycan Turbo
Join Date: Mar 2015
Location: California

iTrader: (0)

Beginning to question the validity of my correlation theory: higher charge is achieved by higher ambient temperature. Did a quick early morning run with the i8 and proceeded to recharge car thereafter. As noted in the snapshot, e-charge allowed for 20 mile charge. Ambient temperaturein garage at 10:32 AM was 68F or 20C.
Attached Images
 
Appreciate 0
      07-09-2015, 09:24 PM   #24
Epirali
Lieutenant
United_States
197
Rep
580
Posts

Drives: BMW e Copper i8 Roadster
Join Date: Mar 2015
Location: Maryland, USA

iTrader: (0)

Sorry not sure what you mean. You should have more capacity and range the warmer it gets.
Appreciate 0
      07-10-2015, 12:20 AM   #25
YWGT3
iDriver
United_States
350
Rep
580
Posts

Drives: BMW i8 & 650GC, Taycan Turbo
Join Date: Mar 2015
Location: California

iTrader: (0)

Quote:
Originally Posted by Epirali View Post
Sorry not sure what you mean. You should have more capacity and range the warmer it gets.

I am wondering whether the extended capacity and range has less to do with the ambient temperature of the garage, where the charge occurs. Specifically, when the garage temp. is between 65-70F, the charging yields a battery capacity range of 17-18 miles. However, this morning's charge produced an electric range of 20 miles despite a garage temp of 68F. So I'm guessing that the extended range has less to do with the ambient temp. and more to do with the temp. near or around the immediate periphery of the battery cells.

Last edited by YWGT3; 07-10-2015 at 12:42 AM..
Appreciate 0
      07-10-2015, 10:01 AM   #26
MalibuBimmer
Founder, Knights of the Roundel website
MalibuBimmer's Avatar
United_States
959
Rep
1,726
Posts

Drives: 2015 M4 and 2018 AMG GT
Join Date: Mar 2008
Location: The Santa Monica Mountains, CA

iTrader: (0)

Garage List
2018 Mercedes AMG GT  [0.00]
2018 Audi Q3  [0.00]
2015 BMW M4  [5.00]
The range shown by the car is based on how it was previously driven and is not necessarily accurate. I've been able to coast down the mountain next to my house and then show 29 miles range. Once I started driving it snapped back to reality.
__________________
Previously: 2014 i8; 2013 650i convertible; 2013 650i Gran Coupe; 2013 X1; 2010 550i GT; 2010 535 GT; 2010 Z4 3.5; 2008 535ixt; 2007 M6 convertible; 2006 650i convertible; 1996 Z3; 1980 633CSi; 1978 630CS; 1972 3.0CS; 1971 Bavaria. (1971; 1979-2005 & 2017 - ? -- the Mercedes years.)
Appreciate 0
      08-15-2015, 04:06 PM   #27
Aye-eight
Major
Aye-eight's Avatar
Switzerland
504
Rep
1,179
Posts

Drives: 2015 BMW i8
Join Date: Mar 2015
Location: My garage

iTrader: (0)

Garage List
Quote:
Originally Posted by yw View Post
I am wondering whether the extended capacity and range has less to do with the ambient temperature of the garage, where the charge occurs. Specifically, when the garage temp. is between 65-70F, the charging yields a battery capacity range of 17-18 miles. However, this morning's charge produced an electric range of 20 miles despite a garage temp of 68F. So I'm guessing that the extended range has less to do with the ambient temp. and more to do with the temp. near or around the immediate periphery of the battery cells.
Previous drives (not sure if one, all, rolling average, ...) affect the range more than ambient temperature.

People seem to quickly forget how unreliable and easily manipulated the range readings are on ICE cars, and now expect the absolute truth from an e-range reading. On a normal car, get the tank down to the last 20 miles, and then try cruising through a city at night @ 35 mph vs. racing down an Interstate at 90. The difference in range is huge. So why wouldn't it be similar in e-drive?
Appreciate 1
      08-21-2015, 03:25 PM   #28
Aye-eight
Major
Aye-eight's Avatar
Switzerland
504
Rep
1,179
Posts

Drives: 2015 BMW i8
Join Date: Mar 2015
Location: My garage

iTrader: (0)

Garage List
Anyway, this thread is supposed to be about data. So here we go: 37km / 23 mi fully electric. If you can drive at a relatively constant low-ish speed (city speed) without interruptions like stop lights or traffic, this is easy.
Attached Images
 
Appreciate 1
      08-21-2015, 03:33 PM   #29
Aye-eight
Major
Aye-eight's Avatar
Switzerland
504
Rep
1,179
Posts

Drives: 2015 BMW i8
Join Date: Mar 2015
Location: My garage

iTrader: (0)

Garage List
Quote:
Originally Posted by MalibuBimmer View Post
In the US BMW says "up to 15 miles." The car meets that easily. The 35-37 kms? Puffery but probably not actionable.
Dunnit. See above. Drive was flat, along a lake. Curves and a few roundabouts, middle of the night, cool air, pretty much smooth sailing.

Keeping speed constant as much as possible, once accelerated to a very moderate cruising pace, is key.
Appreciate 0
      08-22-2015, 10:38 AM   #30
Twitch Massacre
Major
Twitch Massacre's Avatar
United_States
310
Rep
1,299
Posts

Drives: 2015 BMW i8
Join Date: Jan 2014
Location: Miami, FL

iTrader: (0)

Garage List
I12 BMW i8  [0.00]
F13 BMW M6  [0.00]
My car doesn't seem to be able to display more than a 14-15 mile range on a full charge after 1 month of ownership and 1000+ miles. I charge it every night as I like to use eDrive for all my short trips within my neighborhood. Doesn't matter how conservative I am with my driving I can't seem to get it to display more than the 14-15 mile range in EcoPRO. Any tips?
__________________
2015 BMW i8 in Matte Metallic Grey:
H&R Springs
21" ADV.1 ADVNL2 MV2 CS Wheels
Coming Soon:
2016 BMW M4 GTS De-Winged and Bagged on 22s
Appreciate 0
      08-22-2015, 10:48 AM   #31
Epirali
Lieutenant
United_States
197
Rep
580
Posts

Drives: BMW e Copper i8 Roadster
Join Date: Mar 2015
Location: Maryland, USA

iTrader: (0)

Quote:
Originally Posted by Twitch Massacre View Post
My car doesn't seem to be able to display more than a 14-15 mile range on a full charge after 1 month of ownership and 1000+ miles. I charge it every night as I like to use eDrive for all my short trips within my neighborhood. Doesn't matter how conservative I am with my driving I can't seem to get it to display more than the 14-15 mile range in EcoPRO. Any tips?
Have you tried all the basics:

1) Set the car to charge/precondition THREE HOURS or more before you leave from an L2.

2) Ignore the estimated range, reset the trip information in center display.

3) Turn off AC, put car in eco pro mode, try driving on flat terrain with very gentle acceleration and prevent as much stopping as possible (even Regen is only 30-40% efficient).

If you do all of the above you should see somewhere from 17-20 miles before the low SOC will kick the engine on.

Curious have you had other electric cars?
Appreciate 0
      08-22-2015, 10:54 AM   #32
Twitch Massacre
Major
Twitch Massacre's Avatar
United_States
310
Rep
1,299
Posts

Drives: 2015 BMW i8
Join Date: Jan 2014
Location: Miami, FL

iTrader: (0)

Garage List
I12 BMW i8  [0.00]
F13 BMW M6  [0.00]
Quote:
Originally Posted by Epirali
Quote:
Originally Posted by Twitch Massacre View Post
My car doesn't seem to be able to display more than a 14-15 mile range on a full charge after 1 month of ownership and 1000+ miles. I charge it every night as I like to use eDrive for all my short trips within my neighborhood. Doesn't matter how conservative I am with my driving I can't seem to get it to display more than the 14-15 mile range in EcoPRO. Any tips?
Have you tried all the basics:

1) Set the car to charge/precondition THREE HOURS or more before you leave from an L2.

2) Ignore the estimated range, reset the trip information in center display.

3) Turn off AC, put car in eco pro mode, try driving on flat terrain with very gentle acceleration and prevent as much stopping as possible (even Regen is only 30-40% efficient).

If you do all of the above you should see somewhere from 17-20 miles before the low SOC will kick the engine on.

Curious have you had other electric cars?
This is my first electric vehicle. In fact since I moved to the U.S. it's the first one that evades the Gas Guzzler Tax. When I'm on eDrive or Comfort I try to coast, and brake as little as possible.
__________________
2015 BMW i8 in Matte Metallic Grey:
H&R Springs
21" ADV.1 ADVNL2 MV2 CS Wheels
Coming Soon:
2016 BMW M4 GTS De-Winged and Bagged on 22s
Appreciate 0
      08-22-2015, 02:22 PM   #33
Aye-eight
Major
Aye-eight's Avatar
Switzerland
504
Rep
1,179
Posts

Drives: 2015 BMW i8
Join Date: Mar 2015
Location: My garage

iTrader: (0)

Garage List
Quote:
Originally Posted by Epirali View Post
Have you tried all the basics:

1) Set the car to charge/precondition THREE HOURS or more before you leave from an L2.

2) Ignore the estimated range, reset the trip information in center display.

3) Turn off AC, put car in eco pro mode, try driving on flat terrain with very gentle acceleration and prevent as much stopping as possible (even Regen is only 30-40% efficient).

If you do all of the above you should see somewhere from 17-20 miles before the low SOC will kick the engine on.

Curious have you had other electric cars?
Fully agree. Range maximization takes carful and anticipative driving (e.g. coast towards and intersection rather than staying on the gas and then breaking).

Your car will only show more range once you've actually successfully driven that longer range.
Appreciate 0
      08-22-2015, 05:04 PM   #34
MKSixer
Lieutenant General
MKSixer's Avatar
27927
Rep
10,809
Posts

Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States

iTrader: (0)

Garage List
2016 M4 GTS (Allotted)  [0.00]
2013 BMW 328d  [0.00]
2007 BMW M6  [5.00]
2015 BMW i8  [5.00]
Typical Range: 14-15 miles after overnight charge. Typical conditions. HOT...aircon needed nearly all the time!!

I had the vehicle on the 120v charger for the 4 days I was traveling this week and finally drove the car at the end of the fourth day. The range said 14 miles and increased to 16 miles as soon as I turned off the aircon since it was relatively cool (80F).

Here is the kicker. I drove 3 miles in eco-mode and the range didn't budge. It finally started declining at the normal use rate shortly, thereafter.

Question: Has a longer, uninterrupted charging time resulted in better range for anyone else?

P.S. I understand the basic physics and chemistry of Li-ion batteries.
Appreciate 0
      08-23-2015, 09:50 PM   #35
MalibuBimmer
Founder, Knights of the Roundel website
MalibuBimmer's Avatar
United_States
959
Rep
1,726
Posts

Drives: 2015 M4 and 2018 AMG GT
Join Date: Mar 2008
Location: The Santa Monica Mountains, CA

iTrader: (0)

Garage List
2018 Mercedes AMG GT  [0.00]
2018 Audi Q3  [0.00]
2015 BMW M4  [5.00]
Longer charging times don't make any difference. Preconditioning does if you use the aircon. I live in the mountains and when I leave my house in either direction I'm faced with hills, and like the kid who walked to school in the snow, uphill both ways, since I live in a valley I have to go uphill, both ways when I leave my house. The hills are real mileage killers. But I once got 21.7 miles on electric only. I wrote about it on Easter Sunday.
__________________
Previously: 2014 i8; 2013 650i convertible; 2013 650i Gran Coupe; 2013 X1; 2010 550i GT; 2010 535 GT; 2010 Z4 3.5; 2008 535ixt; 2007 M6 convertible; 2006 650i convertible; 1996 Z3; 1980 633CSi; 1978 630CS; 1972 3.0CS; 1971 Bavaria. (1971; 1979-2005 & 2017 - ? -- the Mercedes years.)
Appreciate 1
      08-24-2015, 07:53 AM   #36
Epirali
Lieutenant
United_States
197
Rep
580
Posts

Drives: BMW e Copper i8 Roadster
Join Date: Mar 2015
Location: Maryland, USA

iTrader: (0)

Quote:
Originally Posted by MalibuBimmer View Post
Longer charging times don't make any difference. Preconditioning does if you use the aircon. I live in the mountains and when I leave my house in either direction I'm faced with hills, and like the kid who walked to school in the snow, uphill both ways, since I live in a valley I have to go uphill, both ways when I leave my house. The hills are real mileage killers. But I once got 21.7 miles on electric only. I wrote about it on Easter Sunday.
Where you live with IDEAL weather precon doesn't help with battery , but in other locals and based on ambient temperature it should optimize battery temperature also (with the three hour in advance departure time).
Appreciate 0
      08-24-2015, 07:55 AM   #37
Epirali
Lieutenant
United_States
197
Rep
580
Posts

Drives: BMW e Copper i8 Roadster
Join Date: Mar 2015
Location: Maryland, USA

iTrader: (0)

Quote:
Originally Posted by Twitch Massacre View Post
This is my first electric vehicle. In fact since I moved to the U.S. it's the first one that evades the Gas Guzzler Tax. When I'm on eDrive or Comfort I try to coast, and brake as little as possible.
It takes a little bit of time to learn the "tricks" of optimize the range. What you will learn in truth is how much driving style and speeds impact efficiency, except in a gasoline car you can mostly ignore it and feel back up.

Once you realize how to drive very efficiently using all the information and the "stress" of EVs then you find same techniques apply to ICE vehicles to.
Appreciate 0
      08-24-2015, 09:09 AM   #38
MKSixer
Lieutenant General
MKSixer's Avatar
27927
Rep
10,809
Posts

Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States

iTrader: (0)

Garage List
2016 M4 GTS (Allotted)  [0.00]
2013 BMW 328d  [0.00]
2007 BMW M6  [5.00]
2015 BMW i8  [5.00]
Range this morning after overnight charge, 18 miles.
Appreciate 0
      08-24-2015, 09:47 AM   #39
rap427
Banned
United_States
31
Rep
188
Posts

Drives: 2014 BMW i8
Join Date: Dec 2014
Location: Knoxville, TN

iTrader: (0)

Garage List
What was your outside/garage temp
Appreciate 0
      08-24-2015, 09:55 AM   #40
MKSixer
Lieutenant General
MKSixer's Avatar
27927
Rep
10,809
Posts

Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States

iTrader: (0)

Garage List
2016 M4 GTS (Allotted)  [0.00]
2013 BMW 328d  [0.00]
2007 BMW M6  [5.00]
2015 BMW i8  [5.00]
Quote:
Originally Posted by rap427 View Post
What was your outside/garage temp
Garage - 74.
Ambient - 79.

Both are lower than normal. We have been in the upper 90's to low 100's.
Appreciate 0
      08-24-2015, 10:00 AM   #41
rap427
Banned
United_States
31
Rep
188
Posts

Drives: 2014 BMW i8
Join Date: Dec 2014
Location: Knoxville, TN

iTrader: (0)

Garage List
This weekend I was charging my car and had a power outage in mid charge. After I plugged it back in I only had 13 miles charge after completion for the first time. Usually had 14-15. Just wondering if the interruption caused the difference. Garage was about 80 degrees.
Appreciate 0
      08-24-2015, 10:06 AM   #42
MKSixer
Lieutenant General
MKSixer's Avatar
27927
Rep
10,809
Posts

Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States

iTrader: (0)

Garage List
2016 M4 GTS (Allotted)  [0.00]
2013 BMW 328d  [0.00]
2007 BMW M6  [5.00]
2015 BMW i8  [5.00]
Quote:
Originally Posted by rap427 View Post
This weekend I was charging my car and had a power outage in mid charge. After I plugged it back in I only had 14 miles charge after completion for the first time. Usually had 14-15. Just wondering if the interruption caused the difference. Garage was about 80 degrees.
Unsure.

I had a breaker trip about halfway through the process at one time and simply experienced an interruption. Once I reset the breaker, the charging continued as normal and gave me the usual range...14-15 miles at that point.
Appreciate 0
      08-24-2015, 11:18 AM   #43
MalibuBimmer
Founder, Knights of the Roundel website
MalibuBimmer's Avatar
United_States
959
Rep
1,726
Posts

Drives: 2015 M4 and 2018 AMG GT
Join Date: Mar 2008
Location: The Santa Monica Mountains, CA

iTrader: (0)

Garage List
2018 Mercedes AMG GT  [0.00]
2018 Audi Q3  [0.00]
2015 BMW M4  [5.00]
Quote:
Originally Posted by MKSixer View Post
Range this morning after overnight charge, 18 miles.
Drive it to learn your actual range. I once got my car to say that my range was 29 miles on electric. In actuality I got about 16. (I coasted a lot of hills to get the displayed range that high.)
__________________
Previously: 2014 i8; 2013 650i convertible; 2013 650i Gran Coupe; 2013 X1; 2010 550i GT; 2010 535 GT; 2010 Z4 3.5; 2008 535ixt; 2007 M6 convertible; 2006 650i convertible; 1996 Z3; 1980 633CSi; 1978 630CS; 1972 3.0CS; 1971 Bavaria. (1971; 1979-2005 & 2017 - ? -- the Mercedes years.)
Appreciate 0
      08-24-2015, 02:13 PM   #44
MKSixer
Lieutenant General
MKSixer's Avatar
27927
Rep
10,809
Posts

Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States

iTrader: (0)

Garage List
2016 M4 GTS (Allotted)  [0.00]
2013 BMW 328d  [0.00]
2007 BMW M6  [5.00]
2015 BMW i8  [5.00]
Quote:
Originally Posted by MalibuBimmer View Post
Drive it to learn your actual range. I once got my car to say that my range was 29 miles on electric. In actuality I got about 16. (I coasted a lot of hills to get the displayed range that high.)
Yes. I will perform a cycle this week and report the results.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:42 PM.




bmw
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST