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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.

BMW discussing supercar collaboration with McLaren

BMW is reportedly considering a new halo supercar. But rather than go it alone, word has it that the Bavarian automaker is discussing a potential partnership with McLaren to make the idea a reality. This according to Britain's Car magazine, which suggests that negotiations are well underway. The proposal would see the BMW supercar based on the same architecture that will to underpin Woking's P16 project that's set to replace current 650S. Rather than use the 3.8-liter twin-turbo V8 that McLaren developed together with Ricardo, the Bimmer version would use Munich's own engine: a 4.0-liter V8 with quad turbochargers – two conventional spools and two more electrically driven chargers. Their combined effect would net an expected 750 horsepower. Further differentiations on McLaren's carbon monocoque architecture for use in the BMW would include custom bodywork, aerodynamics, and interior fitments to include a unique instrument panel. Production, however, would be handled at the McLaren Production Centre in Woking, to the tune of several hundred units per year. The project would take the place of several aborted programs undertaken internally at BMW. One called for an entirely unique supercar developed in-house, referred to internally as the M100. When that project was aborted so that BMW could concentrate on the i sub-brand, BMW's own skunkworks shifted its focus to developing a more performance-focused version of the i8, known by some as the i8 CSi. When that project was canned as well, discussions with McLaren commenced. It wouldn't be the first time BMW would outsource development of its own supercar, or even the first time BMW would collaborate with McLaren on such a project. Initial development work on the original M1 in the 1970s was undertaken by Lamborghini before being taken in-house. And, of course, BMW provided the engine for the legendary McLaren F1. Meanwhile McLaren performed a similar function for Mercedes-Benz with the SLR, demonstrating Woking's experience in building flagship supercars for German automakers. This latest project could suffer the same fate as the M100 and i8 CSi programs. But if it is approved, it could yield both coupe and convertible versions, with the first slated to surface at the Frankfurt Motor Show in 2017 and reach dealerships in 2019.