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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.

2015 BMW X3 gets a new nose, diesel power

The second-generation BMW X3 launched in late 2010, and while it's never really wowed us, it's still a solid offering in a highly competitive class. In an effort to keep things fresh, BMW has given its X3 a nip/tuck for the 2015 model year, but perhaps the biggest news (for the US market, anyway) involves what's found underhood.
In addition to the 2.0-liter turbo-four and 3.0-liter turbo-six, BMW will now offer an X3 xDrive28d, fitted with - you guessed it - the 2.0-liter turbodiesel inline four-cylinder engine found in the 328d sedan. Output for this engine is rated at 180 horsepower and 280 pound-feet of torque, and BMW says this oil-burning mill will help the X3 reach 60 miles per hour in just under eight seconds. The automaker hasn't released any information about real or predicted fuel economy figures for the diesel X3, as yet.
What's more, BMW will once again offer a two-wheel-drive X3 in the States - the sDrive28i. Pricing for the refreshed 2013 X3 starts at $39,325, not including $925 for destination. Opting for that diesel will set you back $42,825. Scroll down for the official press release, and check out a new brace of shots live from the soft-roader's Geneva Motor Show debut.

Check out 90 years of BMW Motorrad in 90 seconds

After ninety years in business and first-to-market motorcycle innovations like the one-piece 'tunnel' crankcase, hydraulically dampened front forks and full fairings, as well as that trademark boxer engine, BMW Motorrad is celebrating its nonagenarian status with a video: You can follow the ride on BMW motorcycles from 1923 to now in just 90 seconds.
Okay, so there's more than a video - some anniversary-themed bikes and a new retro boxer model celebrating the R 32 "airhead' from 1923 also commemorate the occasion. But you can start with the video, and that's below.