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BMW M4 Convertible poised for Goodwood unveil

It shouldn't be a shock that BMW is working on a convertible version of the M4. Not only have we caught it testing twice, but this is an automaker that seems willing to build a vehicle for nearly every buyer's needs. Evo claims that the high-performance droptop is going to debut at this year's Goodwood Festival of Speed in England from June 26-29.
Judging from the spy shots we've seen, the M4 Convertible will consist of a retractable hard top like the 4 Series cabrio. Other than the roof, there aren't expected to be many changes from the coupe. The engine will be the same turbocharged, 3.0-liter inline six-cylinder engine, but the added weight of the roof and its mechanism may take a small bite out of performance.
We spoke to BMW USA about the rumor and were told that it has no comment at this time. After the M4 Convertible, Evo claims that BMW is working on a M4 Gran Coupe. How that would be all that different from an M3, isn't exactly clear.

New BMW i3-like Visio.M EV concept uses lightweight resin

It's not a new version of the BMW i3, but an updated version of a lightweight concept car from SABIC, BMW, the Technical University of Munich, Daimler and others does bear a certain resemblance to the well-designed plug-in city car. From the black "glass" in the hatch to the angled line tail lights to the up-and-down window line, you can see a sort of family resemblance (see an i3 comparison photo here). And, of course, they both have an electric powertrain. But the changes made to the new lightweight urban electric concept vehicle is more of an exercise in what's possible rather than a way to evolve the i3 and i8 into a broader i family of vehicles. Even so, what we see here is interesting, since SABIC found all sorts of new ways to take weight out of the car as part of the Visio.M (Visionary Mobility) project, which was first announced in 2012. Let's start with the window material, which as you might guess from the quotation marks above, is not made of glass but is instead SABIC's Lexan polycarbonate (PC) resin plastic. The lower weight (the PC helps shed about 29 pounds) adds two miles of range while the PC resin has better thermal conductivity compared to glass and so does even more because the HVAC system can be more efficient. According to SABIC's computational fluid dynamics analysis, an extra 9-10 miles of range, in fact. Without the battery, this concept weighs just 992 pounds. Remember, BMW already made a lot of weight-reduction measures in the i3 thanks to carbon fiber reinforced plastic, so to make the "glass" lighter would only help boost efficiencies on a production vehicle that uses a resin like this. Read more below. SABIC's LEXAN™ resin delivers weight savings and thermal efficiency for new ultra-lightweight electric car concept developed by BMW-led Visio.M Consortium Munich, October 20, 2014 Today, at the Technical University of Munich (TUM), BMW, Daimler, TUM scientists and a consortium of industry participants showcased a lightweight urban electric concept vehicle with various advances, including an all-plastic design of the car's windows. The windows are made of LEXAN resin, a polycarbonate (PC) material, and coating technologies from SABIC, a leading developer of PC glazing for automotive windows and many other thermoplastic solutions for the automotive industry.

2015 BMW 228i Convertible

BMW history is littered with small, four-seater convertibles that offer style, spirited performance and driving flexibility. These days it's the 2 Series range, not the 1 or the 3, that carries on the droptop-driver's-car tradition, and the 2015 228i Convertible will the first flavor of it to hit US shores. With prices starting in the upper $30k range, conservative but attractive exterior styling and just enough interior comforts and amenities to feel like a true-luxury player, the 228i makes a strong initial case for itself as either a first or second vehicle. Concurrent with my First Drive of the 2015 BMW X6 M, the Germans brought along their new 2 for testing along some pretty mellow Texas driving routes outside of Austin. With roads that ranged from sweeping country lanes to small town streets, and weather changing handily from cold and misty to bright and warm, I got a good sample of what the new open-top 2 can do. Drive Notes I'll admit to getting behind the wheel of the 228i convertible with a bit of a bias: the old 1 Series line, including the droptop, was amongst my favorite BMW models in years. In terms of overall character, this 2 Series has mellowed a lot versus the chuckable, cheerful 1er. The steering response isn't quite so whip-fast, and the longer wheelbase means it's less willing to rotate overall. Of course, the 2, especially in convertible form, does feel better suited for the stereotypical small, premium convertible driver, too. Ride quality over our mostly smooth-road drive route was placid and controlled, and steering still felt steady and weighty on center and with lock added in. The car also offers really well-sorted protection from wind buffeting and noise, both with the top raised and lowered. I drove topless on the highway and on surface streets, and was impressed at how cozy I felt with the wind deflector erected and the windows up. Cold-weather convertiblers should do well with this BMW (especially when the xDrive AWD car launches, later in the year). Erect the folding soft top – a feature that's available at speeds up to 30 miles per hour – and the NVH experience is transformed. BMW says that the top-up wind noise has been reduced "by half" versus the 1 Series – a fact that I had no trouble believing after the first few seconds. Wind rush is basically eliminated with the roof raised, and the car becomes a downright conversational space thusly set up.