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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 4 Series production coupe caught on commercial shoot

Despite filming at 2:00 AM and at an undisclosed location, BMW minders filming a commercial for the fast-approaching 4 Series coupe were unable to ward off the long lenses of spy photographers. The result, as you can see here, is our first-ever look at the production version of BMW's new coupe, completely uncovered.
The night shots may be a little bit grainy, but the fast-moving 4 Series still looks pretty good with its camo closeted, matching the svelte lines of the concept car we saw in Detroit this winter. Expect that the 4 coupe will come to market with a turbocharged 2.0-liter four-cylinder in 428i trim, and a turbocharged 3.0-liter six-cylinder in 435i spec.
Take your time looking through our gallery of movie-star 4 Series photographs, and tell us what you think about the uncovered Bimmer, in comments.

Recharge Wrap-up: BMW i sales hit 50k, SsangYong SIV-2 concept

BMW sold its 50,000th i car in January. The i3, which launched in September 2013, made up roughly 83 percent of those sales. The considerably more expensive i8, which launched in June of 2014, understandably made up fewer sales. The i3 is currently sold in 49 countries, while most of the i8's sales came from the US, UK, Germany, and Norway. Through December, cumulative i3 sales reached 17,116 in the US, 5,063 in Germany, 4,494 in Norway, 3,747 in the UK and 1,348 in Switzerland. i8 sales were 2,820 in the US, 964 in the UK and 793 in Germany. BMW sold 29,513 i-Series cars in 2015, and 1,255 in January of 2016. Read more at Hybrid Cars. SsangYong will debut its SIV-2 concept at the Geneva Motor Show. The SIV-2 – which stands for Smart Interface Vehicle – uses a 48-volt mild hybrid system with a turbocharged, 1.5-liter, four-cylinder engine, 500-Wh battery pack and 10-kW electric motor. The Korean automaker says the modular SIV-2 platform can also accommodate plug-in hybrid and battery electric versions. Alongside the SIV-2, SsangYong will introduce a new Tivoli XLV crossover, based on the XLV Air concept, which is expected to offer competitive fuel economy. Read more at Green Car Reports. Worcester Polytechnic Institute is receiving a $1 million contract from the United States Advanced Battery Consortium (USABC) to make recycled plug-in hybrid batteries. The 50-percent cost-share contract will help Worcester Polytechnic scale up its recycling process to make batteries using recycled cathode material. The process, which USABC calls "novel and efficient," will make the batteries less costly than ones made with all-new material, "thereby offering a value-driven path towards improved sustainability." United States Council for Automotive Research executive director Steve Zimmer says, "These programs are critical to advancing the technology needed to meet both near- and long-term goals that will enable broader scale vehicle electrification." Read more in the press release below. USABC AWARDS $1 MILLION TO WORCESTER POLYTECHNIC TO DEVELOP PROCESS FOR RECYCLED PHEV BATTERY CELLS SOUTHFIELD, Mich., Feb.