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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.

Nissan Recalls More Than One Million Vehicles For Air Bags

Nissan is recalling just over one million cars, SUVs and vans because the front passenger air bags may not inflate in a crash. It's the company's second recall to fix the same problem. The recall affects the Altima midsize car, Leaf electric car, Pathfinder SUV and Sentra compact models from the 2013 and 2014 model years, as well as the NV200 Taxi van and Infiniti JX35 SUV from 2013. Also covered are the Infiniti QX60 and Q50 SUVs from 2014. In documents filed with the National Highway Traffic Safety Administration, Nissan says the vehicles' computer software may not detect an adult in the passenger seat. If that happens, the air bags won't inflate. Nissan will notify owners and dealers will update the software for free. The recall is expected to start in mid-April. Most of the vehicles were recalled in February of last year for a similar problem. Dealers replaced seat sensors, but Nissan said it continued to get consumer complaints and warranty claims in vehicles that had been repaired. Front passenger seats have sensors that determine the passenger's weight and turn off air bags off if a child is on board. The malfunctioning sensors can turn the air bags off even if an adult is in the seat. Nissan received three reports of air bags failing to inflate in a crash. Spokesman Steve Yeager said in an e-mail that he is not sure if anyone was hurt in those incidents. There have been no deaths due to the problem, he said. The recall affects almost 990,000 vehicles in the U.S., another 60,000 in Canada and small numbers in other countries, Yeager said. Related Gallery Nissan Searches For Identity In America

Recharge Wrap-up: Video shows Tesla robots at work, Ghosn disappointed by China's EV market

A video from The Wall Street Journal shows Tesla's new assembly robots at work. The hulking bots are each named after X-Men superhero characters to give them a sense of familiarity and make them less intimidating to the humans working alongside them. Their monikers also reflect their superhuman levels of strength. The naming of the robots appears to have had the intended effect, as human employees refer to the automated machines as colleagues, and are happy to have the help moving the heavy cars around the factory floor. The robots were added as part of an upgrade and expansion to Tesla's factory in Fremont, CA last year. See the video above, and read more at Teslarati. Nissan CEO Carlos Ghosn says that China should offer more incentives to improve disappointing EV sales. Nissan sells its Leaf EV in China as the e30 under its Venucia brand. The company didn't disclose sales figures, but Ghosn is disappointed that EVs aren't "taking off" in China like they are in other markets. Until the market improves for the e30, Ghosn says Nissan probably won't introduce other EVs to China. "The main challenge today is really to encourage, put more incentives, in order for the consumer to buy in," says Ghosn. "Before adding more cars and bringing more technology, we just need to make sure we can sell the technology we already put into the ground." Read more at Automotive News. Total in France will convert its La Mede petroleum refinery to produce biodiesel. Total will stop producing petroleum at the refinery by the end of 2016, then spend $216 million to convert it into the country's first biorefinery. Improved fuel economy and energy efficiency have helped reduce demand for petroleum products in Europe by 15 percent since 2008. Total's response to "the crisis in the European refining industry" is "to innovate and adapt to meet shifting demand trends," according to Total CEO Patrick Pouyanne. "The central focus of Total's plan for our French refining business is to realign our operations and products to changing markets." Read more at Domestic Fuel, or in the press release below. Total's French Refining Roadmap: Upgrade Donges and Transform La Mede April 16, 2015 Paris – Total today presented its French refining roadmap to employee representatives. The plan is designed to give each Total's refining site in France the means to resist in a volatile environment and perform profitably.