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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.

BMW has a rough 100th birthday as share prices slide

BMW is 100 years old now, but falling stock prices are giving the German automaker the birthday blues. Investors are worried about the company's future outlook against luxury rivals, and the shareholders aren't happy about the recent dividend payments, either. According to The Wall Street Journal, BMW's shares dropped almost 2 percent on March 9. Investors have concerns that rivals are closing in. While BMW is in first place, it's not a commanding lead. For example, the German was first in the US luxury market last year with 346,023 deliveries. However, a Polk study found that Lexus actually earned the high-end crown in the US after looking at vehicle registrations rather than sales. BMW performed well last year, including delivering a strong 2.25 million vehicles. Net profits also jumped 10 percent to $7.05 billion, and revenue grew 15 percent, according to the WSJ. However, the shareholders wanted larger dividends after the successful year. The automaker paid out based on a percentage of earnings, but the investors expected more. BMW CEO Harald Kruger has an opportunity to get stockholders back on his side next week when he announces the automaker's new strategy. Expect technology to play a major role in that discussion, including electric vehicles and digital services. We might even see the i5 debut there, according to the WSJ. To be the automotive tech leader of the future, BMW plans to make computer programmers half of its research and development staff. The goal is to develop the most intelligent car on the road. Related Video:

BMW X4 Concept images leak ahead of Shanghai debut

Last month, BMW confirmed that its long-awaited X4 crossover would debut next year, but other than imagining a smaller X6-shaped crossover, we really had no idea what the new niche model would look like. That is until a Russian website, Autowp, leaked a handful of embargoed images this morning showing the X4 Concept that will be unveiled in a couple of weeks at the Shanghai Motor Show.
From what we can see of this concept's styling, there are more elements shared with current BMW models than not. The face of the concept is an attractive blend of the current 3 Series sedan and the X3, while the roofline has definitely plucked right from the X6. This thinly veiled concept should carry over almost untouched when it enters production with the exception of the door handles and the overly stylized fascias and side mirrors. According to CarScoops, it will measure the same length as the current X3 and use the same engine lineup as well. Stay tuned, as we'll have more information on this concept shortly.