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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.

Recharge Wrap-up: Nissan Leaf's UK milestone, SF's renewable diesel

San Francisco's municipal fleet will use renewable diesel, according to Mayor Edwin M. Lee. Switching to the greener fuel will reduce the fleet's greenhouse gas emissions by more than 60 percent. "By changing our fleet's fuel from petroleum to renewable diesel, we're taking action that is good for the global climate, and at the same time promotes environmental justice in our community by leading to cleaner, healthier air for some of our most vulnerable neighborhoods," Lee says. While renewable diesel is more expensive than the petroleum-based product, with government incentives, it could end up saving the city money. Read more from Biodiesel Magazine. Nissan has sold its 10,000th Leaf in the UK. As of July 6, Nissan has tallied 10,161 Leaf sales since its 2011 launch in the UK. More than half of those were sold in the last 12 months. Nissan sold 2,964 Leaf EVs in the first half of this year, an increase of 69.4 percent over last year. "The UK's electric vehicle market is growing at an extraordinary pace," says Nissan's James Wright, "and while it may be too early to talk about tipping points, today's achievement certainly indicates we're well on our way." The Nissan Leaf is the best selling battery electric vehicle in the UK. Read more from EV Meerkat. ClipperCreek has added a new 40-amp EV charger to its lineup. Called the HCS-50, the 240-volt level 2 charger is designed to serve both residential and commercial markets. "The HCS-50's rugged design and ample 25 foot charging cable make it a perfect solution for fleet and commercial applications," says ClipperCreek Sales Manager Will Barrett. "As battery range increases, the vehicle's ability to accept power is increasing, too, and the HCS-50 offers users extra power to get their vehicles charged up and back on the road fast." The HCS-50 charging station is priced at $835. Read more in the press release below. ClipperCreek Announces Availability of HCS-50 Electric Vehicle Charging Station Top selling EVSE manufacturer releases high-powered 40 amp EV charging station AUBURN, Calif., July 22, 2015 /PRNewswire/ -- ClipperCreek has added the HCS-50 electric vehicle charging station to their product line. The HCS-50 is a powerful and rugged 40 amp station paired with a highly durable rubber overmolded cable and vehicle connector. Offering power, reliability and value, this 240 volt, level 2 electric vehicle charging station, rated for both indoor and outdoor use, is priced at $835.

Recharge Wrap-up: video touts Volvo electric buses, Nissan and BMW build EV chargers in S. Africa

Volvo is touting the advantages of electric buses in a new video. The short film, called Route 55, promotes the ElectriCity Project for public transport, and, more specifically, the new electric bus route in Gothenburg, Sweden. The new route debuts June 15 using Volvo electric and hybrid buses. In the video, two teenagers are seen waiting for the bus. As one boards, the other asks her out from the sidewalk, but she can't hear him over the noise of the diesel bus, which then closes its doors and drives away. The film asks, "What if this bus had been silent?" See the video above, and read more in the press release below. BMW and Nissan will build an EV charging network across South Africa. Through 2017, the two automakers will build fast-charging and AC stations around the country in order to encourage the adoption of EVs. Nissan has been selling the Leaf in South Africa since 2013, and BMW introduced the i3 and i8 in March. "In order for the introduction and expansion of electric vehicles as well as plug-in hybrid electric vehicles to be successful in this market, we need to work together," says BMW South Africa Managing Director Tim Abbott. Read more at Automotive News Europe. The Renault-Nissan Alliance will provide the United Nations with 200 electric vehicles for the COP21 climate conference in Paris. The fleet of vehicles includes the Nissan Leaf and e-NV200, as well as the Renault ZOE, Kangoo ZE and Fluence ZE. The entire passenger car shuttle fleet will use all-electric vehicles as some 20,000 UN attendees descend upon Paris from November 30 to December 11. "Thanks to the Alliance's fleet of 100-percent electric vehicles, it will contribute to our goal of achieving a carbon neutral event," says French Minister of Foreign Affairs and International Development and COP21 President Laurent Fabius. "The technology of electric vehicles helps reduce greenhouse gases in the transportation sector efficiently." Read more from Renault. Visa will be the official title sponsor of the Formula E London ePrix. Officially called the "2015 FIA Formula E Visa London ePrix," the races on June 27 and 28 will be the last of the electric racing series's inaugural season. Visa Europe will award the Visa Fastest Lap trophy after the each round, and will have interactive activities at the race's eVillage.