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BMW reveals M4 safety car with innovating water injection system [w/video]

Racing series don't just pick their safety cars at random, or use just whatever car is lying around. These days the car that sets the pace at the front of the pack is typically provided through consideration by a sponsor. In the MotoGP series, that's BMW and its M division, which have served up the Official Car of MotoGP since 1999. What you're looking at is the latest, and it packs some innovative technology on board. Aside from the matte black wrap with BMW's iconic striped livery, upgraded aero kit, retrofitted interior and emergency equipment, this BMW M4 coupe packs a new injection system under the hood. Only instead of injecting fuel, it injects water into the combustion chamber – something that wouldn't usually be recommended, but BMW insists actually aids in the combustion process. The idea is that the temperature of the air being mixed with the fuel inside the engine is usually hotter than ideal, so the system injects a fine mist of water into the collector in order to reduce the air's temperature... sort of like one of those hydrating misters at an amusement park or outdoor mall, but in an even hotter environment. The system brings the temperature of the air down to a more optimal temperature, helping it combust better. The process is said to yield a number of positive effects. For one, it reduces knocking. For another, it can make more out of lower-octane fuel where higher octane isn't available. It also can control the adverse effects of higher ambient temperature on the combustion process. But most of all, it increases output and reduce fuel consumption by around eight percent. Whether that eight percent is worth the added weight of the system – particularly with water pump and a 1.3-gallon tank in the trunk – is up for debate. But we'd imagine that the Bavarian engineers have weighed very carefully. Of course there's also the matter of refilling the water tank, which BMW says would be carried out whenever the safety car is refueled, but in real-world conditions would only necessitate attention once every five top-ups at the gas station. By now you might have guessed that BMW probably didn't develop this system just for the MotoGP safety car, and isn't planning on keeping it confined to the racetrack. Instead it's being tested and demonstrated on the safety car before being rolled out on production models in the future.

2015 BMW Alpina B6 xDrive Gran Coupe

Alpina has been lovingly modifying BMWs for half a century, but as we learned during a tour of the company's HQ in Buchloe, Germany, Alpina has been in the wine distribution business for nearly as long. The company has an estimated million bottles on reserve in two warehouses and a beautiful wine cellar/tasting room on property in western Bavaria, just yards from where its 1,500 hand-crafted automobiles per year are produced.
What does that have to do with the new B6 Gran Coupe? Well, it may help make sense of the overall character of Alpina's automobiles, especially vis-à-vis the similarly priced, similarly powerful M Cars that BMW sells in far greater numbers. Alpinas are built by wine connoisseurs for wine connoisseurs, or wine connoisseur types; they are not rip-snortin' racecars for the road - that's M's domain. Alpinas are esoteric, rich in character and nuanced. But make no mistake: they are very, very fast.
Our brief first drive of the B6 Gran Coupe - the only 6 Series-based Alpina we'll get in the US for 2015 - took place on German autobahns and Austrian alpine roads, where the car is more at home than anywhere in the world, both literally and figuratively. With 540 horsepower and 540 pound-feet of torque on tap from its twin-turbocharged 4.4-liter V8 and xDrive all-wheel drive, the B6 is said to be able to hit 60 miles per hour in 3.7 seconds on its way to a top speed of 198 mph, a massive 43 mph faster than the M6, which is electronically limited to 155 mph. Yet even at insane speeds - we saw an indicated 190 mph on one particularly lonely stretch of Autobahn - the B6 feels more luxurious than sporty, taking the countenance of a low-slung Bentley Continental GT or an Aston Martin Rapide S, not a knife-edged supercar. It doesn't feel scintillating like a Porsche 911 GT2; rather it feels rock steady, like the 4,780-pound luxury sedan it is.

BMW M4 Convertible spied with naked top and trunk

Our trusty spy photographers have been at it again, snagging these first images of the forthcoming BMW M4 Convertible without camouflage on its retractable roof and rear deck. You'll recall that this is not the first time we've seen the followup to the M3 Convertible, but that the last batch of images we had were encumbered by a lot more camouflage - this car is virtually naked by comparison.
Not surprisingly, the M4 looks to share its folding hardtop design with the standard 4 Series droptop, and it should operate in a similar manner as well. It's no surprise, but it looks like BMW is going to try and make the transition from M4 Coupe to M4 Convertible as effortless as previous efforts converting the M3 to an M3 Convertible. That should mean that below the beltline, this car is nearly identical to the coupe we saw in Detroit.
As for the camo'd features on these spy photos, the hood, front fascia, rear fascia, quarter panels, side sills and mirrors have all been shown on the M4 Coupe, and don't really bear mentioning. There's been no word of just where the M4 Convertible will make its debut, although considering the lack of disguise on this car, Geneva seems like a likely destination.