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Showing posts with label Tires. Show all posts
Showing posts with label Tires. Show all posts
Friday, July 29, 2011
This is a concept, so the production version will be a bit different, but overall the shape will be pretty much what we see here. They will of course lose the glass side panels and roof, both to be replaced with carbon fiber panels as is the entire outer shell. If you compare it to the renderings in the post below this, you see it is kind of a hybrid of a few of them. There haven't been much details released yet, but some of them of note that I did read are the car will have tall 19" wheels, which are very large diameter for a car of this size. The stated purpose for these are that they lower the rolling resistance and improve efficiency. It will also go 0-60 in under 8 seconds. It will charge on a regular household 110v outlet in six hours. That basically means the battery pack is small as previously reported, probably 16 to 18 kWh. It will also have a range extender option that BMW calls i-REx. The range extender will be a small gasoline(not diesel) engine that will only charge the battery pack, it will not have the ability to drive the wheels directly like the Chevy Volt can under certain circumstances.
I'm sure there will be lot's of info coming out in the next few days, I'll try to get it all up here as soon as it's available.
Tuesday, March 8, 2011
For over a year now BMW has been talking about the 2013 "Megacity" vehicle. It will be the first all electric BMW sold ever. Since it was first announced, we have never actually seen a picture or a clear rendering of what the car will look like, just vague sketches until now. The photos to the left show the actual i3(albeit in camouflage) during cold weather testing.A couple things that stand out immediately are the circular tail lights that extend out from the car. They look cool but I do wonder if they will be prone to breakage. Also note the tall, thin tires. I have heard about these but had not seen any pictures or drawings before these photos. Evidentlly, BMW has been working on a special tire that has very low rolling resistance for the i3. This cars main purpose is to be efficient, and the rolling resistance of tires play a bigger role than you might expect. For example, when BMW puts the winter snow tires on my MINI-E, I immediately see a reduction in range of about 3%. Now if they could design a tire that alone increases the range by 5 to 8%, think of how that helps the overall efficiency of the car. Hopefully this wheel/tire combo will not sacrifice much handling or ride comfort though, because after all, it still needs to feel like a BMW.
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