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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: Tesla's Europe plans, Chevy Bolt details

Hybrid Cars takes a close look at the battery cooling system and gearbox in the 2017 Chevrolet Bolt. While information is still limited, we can make educated guesses about the car's inner workings. The Bolt's liquid battery cooling system appears simpler than that of the Chevy Volt, eschewing active inter cell cooling plates for what appear to be bottom cooling plates. The Bolt has a coaxial gearbox, with the electric motor and the drive shaft on the same axis. It uses a simpler parallel-helical gear set rather than the planetary reduction set used in the Chevy Spark EV. These simplifications have the benefit of helping lower the cost of the Bolt. Read more at Hybrid Cars. Tesla is planning to expand its Supercharger network in Europe in 2016. While a handful of countries in western and central Europe have an established Supercharger network, many European countries still have no Tesla presence. That should change this year, as a map of planned locations includes Spain and Portugal, Ireland, Scandinavian and Italian expansions, and the first Superchargers in many eastern European nations, including Poland, the Balkans, Russia, Ukraine, Romania and even Moldova. By the end of the year, you should be able to take that electric road trip from Lisbon to Moscow you never knew you were planning. Read more at Teslarati. National Biodiesel Board CEO Joe Jobe sat down for an interview with the Tampa Bay Times. In the interview, Jobe discusses biodiesel's environmental impact and relationship with the fuel market. He talks about its production, and its differences from the other major biofuel, ethanol. Jobe says the biggest challenge is dealing with the petroleum industry, which biodiesel needs to work with despite their differences. "It's a threat when you have the largest, wealthiest most powerful industry in human history making it a top priority to eliminate policy that is aimed at helping incentivize renewable energy," says Jobe. Read more from the Tampa Bay Times. Related Gallery 2017 Chevrolet Bolt EV: Detroit 2016 View 10 Photos News Source: Hybrid Cars, Teslarati, Tesla Motors, Tampa Bay Times Green Chevrolet Tesla Alternative Fuels Biodiesel Electric recharge wrapup

GM recalls half-million full-size SUVs to address seatbelt issue

GM is recalling its redesigned full-size SUV models to address improperly riveted mounts securing the third-row seatbelts that may fail in the event of an accident. The population includes the 2021-2022 Cadillac Escalade and Escalade ESV, 2021-2022 Chevrolet Suburban and Tahoe, and 2021-2022 model year GMC Yukon and Yukon XL, for a total of 484,155 vehicles. "Operators at the supplier’s manufacturing plant may have not properly followed manufacturing processes and inadvertently missed the rivet forming operation," GM said in its defect report to NHTSA. "In certain of these vehicles, the rivet that retains the buckle to the mounting bracket in the left or right side third-row seatbelt buckle assembly may not have been properly formed during the manufacturing process. If the third-row seatbelt assembly is not properly riveted, it may not properly restrain occupants in a crash, increasing the risk of injury." Fortunately, the fix is relatively simple. GM service technicians will inspect the rivets on the rear seatbelt buckle assemblies and replace the entire unit if the rivets are not to spec. Dealer notifications have already been distributed; owners should receive notice start in September. Related video: Cadillac Chevrolet GM GMC Ownership Safety SUV