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by Joff
Tue Apr 02, 2019 12:02 pm
Forum: Technical BMW i3 Discussions
Topic: Tire pressure and miles per Kwh
Replies: 9
Views: 2915

Re: Tire pressure and miles per Kwh

[quote="jadnashuanh"]It probably makes a little difference. Raising the pressure will also tend to wear out the center of the tread, shortening the life of the already low life tires. That effect is more pronounced on wider tires. One hypermiler (different car) found he got more miles out of his tir...
by Joff
Mon Apr 01, 2019 5:32 pm
Forum: Technical BMW i3 Discussions
Topic: Tire pressure and miles per Kwh
Replies: 9
Views: 2915

Tire pressure and miles per Kwh

It is accepted that higher tire pressure results in lower rolling resistance. Has anyone measured the difference in in raising the i3's tire pressure over stock spec? I would think that if higher pressure can give a measurable increase in mpg in an ICE car, the difference should be higher in an elec...
by Joff
Mon Mar 18, 2019 8:49 am
Forum: Technical BMW i3 Discussions
Topic: When the battery is flat
Replies: 16
Views: 3679

Re: When the battery is flat

I find my I3 rolls very easily in neutral, when it has a enough charge. I suspect it is electronically mimicking holding the accelerator right between calling for power and regen. Without sufficient charge, it cannot do that, and so the spinning motor becomes the generator. See if your I3 rolls more...
by Joff
Sun Mar 17, 2019 4:10 pm
Forum: Modifications & Accessories
Topic: Installation of an auxiliary heater to improve electric range
Replies: 6
Views: 2399

Re: Installation of an auxiliary heater to improve electric range

Great solution! Is there separate pumps for interior heating and battery thermal management? have you checked the battery temperature, to make sure it does not get too warm? Inspirational post!
by Joff
Wed Feb 20, 2019 6:21 pm
Forum: Modifications & Accessories
Topic: rapid charge retrofit?
Replies: 49
Views: 20142

Re: rapid charge retrofit?

I have looked around and not seen any evidence that anyone has completed a DC fast charge retrofit, even on other brands. A very basic diagram of how the DC charge is supposed to work, just shows the wires from the socket going to the BMS on the battery, instead of the onboard charger as it does for...
by Joff
Mon Feb 18, 2019 4:49 pm
Forum: News and Main BMW i3 Forum Discussions
Topic: 800 miles back and forth trip on Level 2
Replies: 1
Views: 1863

Re: 800 miles back and forth trip on Level 2

Thanks for posting! I too have a 2014 BEV I3 with no fast charge option. I would like a REX and fast charge option, but for $12k and not oweing a dime, I am super happy with what I have. The wife and I are daydreaming about taking a long trip, stopping at libraries and other interesting places that ...
by Joff
Thu Feb 14, 2019 2:21 pm
Forum: General / Main i3 Owners Forum
Topic: No owners manual
Replies: 2
Views: 2410

No owners manual

I bought a 2014 I3 bev that came with no owners manual. I do want to learn all I can about it. Is it worth getting? I sorta spent my disposable cash on the car, so if I can get all the info online, I will go with that. Thanks!
by Joff
Fri Jan 04, 2019 8:28 am
Forum: News and Main BMW i3 Forum Discussions
Topic: Flat towing i3 "4 wheels down" behind rv
Replies: 8
Views: 4288

Re: Flat towing i3 "4 wheels down" behind rv

Thanks for the replies. If the car can coast freely in neutral, I would reason the motor can't be producing a lot of heat or current, as the energy can't be produced without some resistance to movement. Maybe it would make too high a voltage if there was no load on it? If there is a chance it would ...
by Joff
Thu Jan 03, 2019 9:06 am
Forum: News and Main BMW i3 Forum Discussions
Topic: Flat towing i3 "4 wheels down" behind rv
Replies: 8
Views: 4288

Flat towing i3 "4 wheels down" behind rv

I know that it manual says the I3 can not be towed with it's drive wheels turning. I understand that the motor turns whenever the drive wheels turn. Does it also say you can't shift it into neutral and coast down a hill? Because I don't see a big difference, except that you can tow farther than you ...
by Joff
Wed Jan 02, 2019 3:03 am
Forum: General / Main i3 Owners Forum
Topic: What happens when you shift into "neutral" while moving?
Replies: 10
Views: 5195

Re: What happens when you shift into "neutral" while moving?

So if there is no harm in coasting in neutral, what is the reason that the manual forbids towing "four wheels down"? Are they worried a person might leave it in drive, and overcharge the battery?

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