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BMW i8 pitted against M4 in sibling rivalry track battle

We recently watched Auto Bild challenge the BMW i8 against the M4 in a German drag race of decide the quicker of the inter-brand rivals. The hybrid took a commanding victory in that fight. However, Autocar now has a new battle for the two coupes. The siblings are together again on the Castle Combe Circuit to find out which of them offers the more enjoyable experience at the track. Unfortunately, we don't ever get a perfect point of comparison in the video because host Steve Sutcliffe never does a full lap in anger with either of them to set a time. Instead, he focuses more on how the BMWs feel behind the wheel. Sutcliffe also admits midway through the clip that the i8's electric motor is out of juice to power the front axle's electric motor. That only leaves the hybrid with its 228-horsepower and 236-pound-feet-of-torque turbocharged three-cylinder to spin the rear wheels. Still, Sutcliffe spends ample time explaining the benefits and downfalls of driving these coupes. See where his opinion falls between the M4 as the traditional German sports coupe and the i8 as the new-school hybrid in the video, above.

2017 BMW Alpina B7 xDrive is an M7 by any other name

Have you been waiting for BMW to release a more potent version of the new 7 Series? Try 600 horsepower on for size and forget all about the famous M badge. The new flagship performance sedan from Munich is the 2017 BMW Alpina B7 xDrive. Alpina is Bimmer's tuner of choice, and it designs customized features to integrate precisely with the factory build. The B7's 4.4-liter twin-turbocharged V8 is massaged to deliver a nice, round 600 horsepower, and a torque figure nearly as impressive at 590 pound-feet available from just 3,000 rpm. All that muscle is channeled through an eight-speed automatic to all four wheels (as you might have guessed from the new xDrive handle). The result is an Autobahn-blitzing 0-60 time quoted at just 3.6 seconds – 0.8 seconds quicker than its predecessor – and a top speed estimated at 193 miles per hour. Those would have been considered supercar figures not that long ago, but are delivered here in a luxury sedan as big as they come. They also stand up pretty well to the forced-induction eight-cylinder competition in the Audi S8 Plus, Jaguar XJR, Maserati Quattroporte GTS, and Mercedes-AMG S63. The Audi produces a bit more power but less torque, the Mercedes does the opposite, and the Jaguar and Maserati are left in the dust. Only the S8 Plus dares claim a quicker 0-60 time, and even then it's only said to be a tenth quicker. (The Mercedes-AMG S65 boasts much higher output from its V12, but without an all-wheel drive system capable of handling all its muscle, it's a fair bit slower off the line.) Keeping all that momentum under control is an air suspension with adaptive dampers, active roll bars, and four-wheel steering. It's all mounted to 20-inch wheels wearing Michelin Pilot Super Sport rubber and packing oversized brakes measuring 15.5 inches at the front (with four-piston fixed calipers) and 14.5 inches (with floating calipers) at the back. Of course it also benefits from all the advancements that the Bavarian automaker developed for the latest 7 Series, but takes things a step further with a specific aero kit and an interior decked out in even more upscale leather and trim. The finished product may not wear an M7 badge as so many have called for from BMW's flagship sedan series over the years. But the Alpina name carries a cachet all its own and has for the past 50 years now – which is a few years longer than BMW M GmbH has been around.

Check out the trick way you access the tire valve on this BMW Alpina B6

The wheels are one of the first things you notice when checking out the 2015 BMW Alpina B6 xDrive Gran Coupe. The 20-inch aluminum alloy rollers have 21 spokes that spray out from their hubs, creating one of Alpina's signature design features. But there's also plenty of function to go along with the stylistic form of this hotted-up BMW 6 Series Gran Coupe.
By rotating the Alpina roundel and unlocking the center hub, you gain access to the tire valve and bolts, which are hidden inside. They're literally kept under lock and key, and they protect your Alpina's wheels from the elements and theft. This unique center-fill system employing a hollow spoke isn't a new setup for the favored BMW tuner, but since Autoblog had one in our offices this week, we thought we'd take the opportunity to show the unique mechanism in case you haven't seen it before. Check it out in our brief video below.