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BMW 7 Series could get M variant alongside Alpina B7

BMW is launching the new 7 Series with a limited engine lineup, but according to Car and Driver, there are more powerful versions on the way – including a potential M Performance model. The new 7 Series is initially being offered with a 320-horsepower turbo six and a 445-hp twin-turbo V8. European customers will also be able to spec a 261-hp diesel or a 320-hp hybrid. There's an M Sport package available as well with enhanced visual cues, but that won't be the extent of the performance choices when all is said and done. Expect a new 760i that will pack BMW's twin-turbo V12, and a new Alpina B7 to feature a more powerful twin-turbo V8 with around 600 horsepower. In parallel to the Alpina, however, C/D reports that an M Performance model could finally be in the works, which would ostensibly offer BMW the opportunity to go after the likes of the Audi S8, Jaguar XJR, and Mercedes S63 AMG, without changing tacks too drastically over the resolute position it's taken in the past against creating a full-on M7. C/D reports that there are more powerful diesels joining the lineup in the future, but those aren't likely to make their way to US showrooms anytime soon.

BMW i3 REx can be hacked to offer more miles, AM radio

If you're a BMW i3 REx owner who's willing to risk voiding your warranty, there's a low-level hack that offers up an interesting question. Which is worth more, an extra 20 miles or so of range from the gas-powered range extender or the ability to listen to local sports, like, for example, the iconic Vin Scully on Los Angeles Dodger broadcasts? The choice might be easy for Dodger fans, but it could be a bit more challenging anyone ready to make a road trip. The i3 REx is considered a zero-emissions vehicle under the odd rules from the California Air Resources Board (an important category for automakers) because the miles provided by the gas-powered range extender are about equal to the single-charge range of the vehicle's battery, Green Car Reports says. Some enterprising folks have figured out how to modify the software to tweak the car's capabilities. That means that instead of being able to put in only 1.9 gallons of fuel at a time into the tank, you can put in 2.4 gallons, allowing for that extra 20 miles of driving range. Additionally, the i3 REx's software suppresses AM radio because of potential electromagnetic interference from the electric drivetrain. But, again, that can be reversed with a few tweaks to the software. We need to give out a warning, though: messing with these sorts of software settings is a good way to void your warranty. So, if you're in LA and thinking about enjoying that Dodger (or, dare we say, Giant) broadcast and a few extra driving miles, make sure to figure in all of the factors. Related Video: Featured Gallery BMW i3 Coupe Concept: LA 2012 View 18 Photos News Source: Green Car Reports Green BMW Electric California warranty range extender software

Is the skill of rev matching being lost to computers?

If the ability to drive a vehicle equipped with a manual gearbox is becoming a lost art, then the skill of being able to match revs on downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. The usefulness of rev matching in street driving is limited most of the time – aside from sounding cool and impressing your friends. But out on a race track or the occasional fast, windy road, its benefits are abundantly clear. While in motion, the engine speed and wheel speed of a vehicle with a manual transmission are kept in sync when the clutch is engaged (i.e. when the clutch pedal is not being pressed down). However, when changing gear, that mechanical link is severed briefly, and the synchronization between the motor and wheels is broken. When upshifting during acceleration, this isn't much of an issue, as there's typically not a huge disparity between engine speed and wheel speed as a car accelerates. Rev-matching downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. But when slowing down and downshifting – as you might do when approaching a corner at a high rate of speed – that gap of time caused by the disengagement of the clutch from the engine causes the revs to drop. Without bringing up the revs somehow to help the engine speed match the wheel speed in the gear you're about to use, you'll typically get a sudden jolt when re-engaging the clutch as physics brings everything back into sync. That jolt can be a big problem when you're moving along swiftly, causing instability or even a loss of traction, particularly in rear-wheel-drive cars. So the point of rev matching is to blip the throttle simultaneously as you downshift gears in order to bring the engine speed to a closer match with the wheel speed before you re-engage the clutch in that lower gear, in turn providing a much smoother downshift. When braking is thrown in, you get heel-toe downshifting, which involves some dexterity to use all three pedals at the same time with just two feet – clutch in, slow the car while revving, clutch out. However, even if you're aware of heel-toe technique and the basic elements of how to perform a rev match, perfecting it to the point of making it useful can be difficult.