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2015 BMW M4 Convertible is here to put wind in your sails

Each generation of the BMW M3 has included a convertible model. Even the distant E30, the patriarch of the M3 line, had an ultra-rare (only 787 were built) droptop model. The convertible became more common on the successive generations, with the hardtop-convertible E93 being the most recent. Considering this history, there seemed very little doubt that as the M3 became the M4, a convertible would be in the cards. Now, the new droptop has arrived.
Set for its global debut at the 2014 New York Auto Show, the 2015 BMW M4 Convertible features, like its forbearers, everything that's great about the hardtop variant while adding an unlimited amount of head room. That means the same 3.0-liter, 425-horsepower, 406-pound-foot, twin-turbocharged straight six sits under its domed hood, while either a six-speed stick or a seven-speed M dual-clutch transmission dispatches power to the fat rear tires.
As for specific differences between the hardtop and the new convertible, obviously, the droptop is heavier. A lot heavier. Where an M4 with a six-speed manual tips the scales at 3,530 pounds, the M4 Convertible weighs in at 4,055 pounds. Believe it or not, BMW has actually trimmed 90 pounds from the last-generation M3 convertible, code-named E93. This marginal weight reduction from the third-generation convertible to the fourth is barely half of the 174 pounds BMW was able to subtract when transitioning from M3 Coupe to M4 Coupe.

Take a look at the shocking Rolls-Royce Next 100 concept

Rolls-Royce showed off its Vision Next 100 concept today in London, giving a look at what its vehicles might look like a century years from now. Each BMW brand will show its own concept this year; BMW's Vision Next 100 concept was an interesting mix of textile-like patterns with stretchy fenders and a very 2010s four-door coupe shape, but this Rolls-Royce concept looks more like a luxury version of a World Solar Challenge racer. The car's official title is 103EX, following the convention of recent Roller concepts. Whereas its BMW counterpart was perhaps a safe, predictable vision of the future, the Rolls is a striking vehicle and a big departure for the brand. Whether it works as a whole for you or not, it represents the kind of stylistic provocation that made ex-BMW stylist Chris Bangle a household name. While the early Bangle cars were extremely controversial, this Rolls concept is clearly the heir of his penchant for sharply creased character lines. Call the rocker panel crease flame surfacing if you want. The floating headlamps and blade-edged verticality of the fenders are classic Rolls: imposing and visually heavy, without necessarily being classically beautiful. The square, flat grille is, to my eyes, much less successfully integrated. It seems like Rolls had the perfect opportunity to evolve the trademark grille into something more contemporary. In 100 years, the brand will still need to lean on this sort of anachronism? That seems short-sighted. We'll have more on this concept from our man on the ground in London later today. Featured Gallery Rolls-Royce Vision Next 100 Concept View 27 Photos Design/Style BMW Rolls-Royce Coupe Autonomous Vehicles Concept Cars Future Vehicles Luxury

How to charge up your BMW i3 with a Honda

Behold a cheaper version of BMW's range extender for its i3 plug-in. And it's brought to you by ... Honda? Sort of, if you take the approach that Gadget Review took when it looked for an alternative to ponying up the $4,000 or so for the gas-powered i3 range extender that comes from the factory. What was procured was a Honda portable generator for Home Depot for the experiment, which involved gassing the generator up in a parking lot, plugging in the i3 and going out for a cup of coffee. The result was that, after about a half-hour of charging, the i3 picked up about four miles of driving range. Not exactly revolutionary but it least a bit instructive. And given that Honda generators start at about $800, the idea, while clunky, is potentially cash-saving. Gadget Review briefly took the experiment one-step further by trying to run the generator inside the back of the car and plugging in, complete with a rigged-up ventilation system, but the host thought better of it once he realized that there'd be suffocation involved. Why this was never tried on the Nissan Leaf, we'll never know. Check out Gadget Review's five-minute video below.