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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.

Chevy bringing Spark RS Concept to SEMA

Well, the SEMA mess has well and truly begun. Every year, an increasing number of automakers flock to the Las Vegas auto show, bringing accessories and concept vehicles that are both awesome as well as occasionally questionable. Chevy will bring an RS concept of the new Spark to SEMA, signaling that its styling package will be applied to the brand's smallest vehicle in the near future. We can expect the usual stuff in a production Spark RS – larger wheels, a slightly sportier cabin, a more aggressive body kit, and a small drop in ride height – but for the concept, Chevy wasn't restrained by things like budget. The front splitter, and sill extensions, foglight surrounds, and rear bumper insert are all finished in carbon fiber. The 17-inch alloys are apparently inspired by the Corvette Z06's Z07 package, while the Dark Liquid Switchblade Silver paint is broken up only by a driver's-side stripe. The company is also using SEMA to show its new Red Line accessories, features both concept and production parts for the Trax, Camaro, Malibu, Colorado, and Sierra. Every vehicle gets Enhanced Silver Metallic paint, a charcoal finish on the roof, satin graphite/red graphics, black/red badge kits, and aside from the Colorado, tinted lamps. Individual mods for the Trax include relatively simple tweaks, including new 18-inch wheels, blacked-out bowtie badges, a lowered ride height, and custom badging. It's a similar story on the Malibu, except that its 19-inch wheels are a smidge larger, and its lowered ride height is the result of a concept kit. The first concept based on the new Camaro opts for 20-inch wheels, while adding a few more performance items. The ride height has been lowered, there's a new air intake system, and an upgraded brake package. Chevy has also replaced the front upper and lower grilles inserts with red accents. On the pickup side of the coin, the Colorado gets 18-inch wheels, new intake and exhaust systems, Goodyear Wrangler Fortitude tires, and flared wheelarches. The Silverado gets similar intake and exhaust upgrades, as well as the largest wheels of them all, with 22s at all four corners. The full-size truck also gets a Brembo brake package, while every vehicle, aside from the Camaro, gets Thule roof-mounted accessories. You can check out all six concepts in the gallery above, and then be sure to keep an eye open for live images from the floor of the 2015 SEMA show, slated to open next month.

Chevy Volt sales surge with 2016 model, Nissan Leaf continues Autumn fall

The Nissan Leaf and Chevy Volt have been locked in sales combat since they arrived within a short distance of each other way back in 2010, and we continue to follow that fight closely. Though both vehicles approach driving efficiency from a different angle, they each have plugs and owners put a surprisingly similar number of electric miles on them. With the launch of its 2016 model, the Bowtie brand now appears to have the upper hand, clocking in a solidly improved performance for the month of October. According to GM's sales charts, the Chevy Volt made it into the loving embrace of 2,035 buyers last month. That's up a whopping 41 percent over the same period in 2014, and more than a 100 percent improvement from the 949-unit result in September. Now, we don't know how many of these were 2015 models and how many were the all-new 2016 edition. Dealers are, no doubt, incentivized to move the old inventory, and the latest and greatest is still only available in a limited number of states. Breaking out the sad trombones, Nissan recorded a mere 1,238 units moved in October. That's down 52.2 percent from the same month in 2014. That's also nine fewer examples than last month. Despite its recent sales travails, the Leaf still leads the calendar-year-to-date figures by a commanding 14,868 to 11,299 tally. We imagine the Japanese manufacturer is counting on an improvement in the situation once the 2016 model, with its larger, optional 30 kWh battery becomes available. You can compare these two stalwarts with the rest of the green-vehicle field in our By The Numbers post due out tomorrow. Green Chevrolet Nissan Electric Hybrid ev sales hybrid sales volt