2005 - Bmw X5 on 2040-cars

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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 reveals new X5 Security Plus in Moscow

A major player in the Russian market, BMW is heading to the Moscow Motor Show this month with a slew of local debuts... most of which we've already seen. But among all the new models making the trek from Bavaria to Moscow will be the new X5 Security Plus.
In a new-model launch that will surprise exactly no one, BMW's latest armored vehicle upgrades the X5 with enhanced protection for oligarchs against Chechen rebels, AK47-touting gangsters and missiles randomly falling on Crimean highways. Now meeting the VR6 standard of ballistic protection, the new X5 Security Plus incorporates reinforced bodywork, seats and joints, along with bulletproof glass.
Of course all that reinforcement (not to mention the jars of beluga caviar and bottles of Stoli in the glovebox) will come with a weight penalty, but the 4.4-liter twin-turbo V8 ought to do the trick, driving 450 horsepower through BMW's xDrive all-wheel-drive system to get the vehicle's occupants out of a war zone in a hurry.

BMW expands Takata airbag recall nationwide, 140k 3 Series affected

Following the urging of the National Highway Traffic Safety Administration, BMW has expanded its recall of vehicles equipped with Takata airbag inflators to cover the entirety of the United States, rather than just high-humidity areas. That means there are about 140,000 owners of 2004 to 2006 model year BMW 3 Series coupes, convertibles, sedans and wagons (that means owners of both E46 and E90 3ers should take note). It's unclear if this recall includes the high-performance M3 Coupe and Convertible. With the expansion of its airbag recall, BMW joins Honda, Mazda, Ford and Fiat Chrysler in moving from a regional to a nationwide recall of vehicles equipped with Takata airbags. According to Reuters, BMW claims none of its vehicles have been subject to the potentially harmful airbag deployments.