C2 Cabriolet 09 Six Speed Bose Xenons Navigation Very Low Miles Silver/navy Navi on 2040-cars

Auto blog

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.

Automakers want to stop the EPA's fuel economy rules change, and why that's a shortsighted move

With a Trump Administration looming, the EPA moved quickly after the election to propose finalizing future fuel economy rules last week. The auto industry doesn't like that (surprise), and has started making moves to stop the EPA. Ford CEO Mark Fields said he wanted to lobby Trump to lower the standards, and now the Auto Alliance, a manufacturer group, is saying it will join the fight against cleaner cars. The Alliance represents 12 automakers: BMW, Fiat Chrysler, Ford, GM, Jaguar Land Rover, Mazda, Mercedes-Benz, Mitsubishi, Porsche, Toyota, VW, and Volvo. Gloria Bergquist, a spokesperson for the Alliance, told Automotive News that the "EPA's sudden and controversial move to propose auto regulations eight months early - even after Congress warned agencies about taking such steps while political appointees were packing their bags - calls out for congressional action to pause this rulemaking until a thoughtful policy review can occur." The EPA was going to consider public comments through April 2017, but then said it would move the deadline to the end of December. That means that it can finalize the rules before President Obama leaves office. The director of public affairs for the Consumer Federation of America, Jack Gillis, said on a conference call with reporters last week when the EPA originally announced its decision that it is unlikely that President Trump will be able to roll back these changes. Gillis also said on the same call that any attempt by the automakers to prevent these changes would be history repeating itself. "These are the same companies that fought airbags, and now promoting the fact that every car has multiple airbags," he said. "These are the same companies that fought the crash-test program, and now are promoting the crash-test ratings published by the government. So, it's clear that they're misperceiving the needs of the American consumer." There are more reasons the Allliance's pushback is flawed. Carol Lee Rawn, the transportation program director for Ceres, said on that call that the automotive industry is a global one, and many automakers are moving to global platforms to help them meet strict fuel economy rules around the world.

Recharge Wrap-up: 2015 Fuel Economy Guide available, how Porsche ships 919 Hybrid

The EPA and Department of Energy have released the 2015 Fuel Economy Guide. Unsurprisingly, the groups say that this year features more fuel efficient and low-emissions vehicles than previous years, and they span a greater variety of vehicle types. The guide also provides "best-in-class" lists, greenhouse gas ratings and estimated fuel costs for each vehicle. The EPA and DOE hope that car buyers will use the guide to help choose cars that are better for the environment and the climate. Check out the guide for yourself or read more in the press release below. To get from one WEC race to the next, Porsche ships its 919 Hybrid LMP1 cars by air. As the team travels around the world - from continent to continent - it must take 35 tons worth of cargo with it, including two LMP1 cars. That means draining fluids, partially dismantling the cars, and fitting everything into a 747. The team also ships items by sea, which requires shipping extra sets of items due to the longer shipping times. "It's all about efficiency," according to Porsche. Read more in the press release below. Terra Motors is unveiling the A4000i electric scooter, which it will sell in Europe, at the EICMA motorcycle show in Milan. The A4000i, which features smartphone connectivity, will be the company's European flagship model. Terra Motors will begin selling in Italy, and plans to make arrangements to sell in several more countries shortly after. Terra hopes to set up manufacturing in Europe, as well. Also on display at EICMA is the company's Bizmo II electric scooter, which has a driving range of 93 miles on a single charge. Read more in the press release below. Volkswagen is providing a 2015 e-Golf to Stanford University for research. The car will be used to study electric mobility, improvements in the driving experience and people's driving behavior and attitudes toward EVs. "Volkswagen's longstanding relationship with Stanford has allowed us to push the boundaries of automotive research and innovation," says Volkswagen's Ewald Goessmann, "and we look forward to extending our work together to drive advances in electric vehicles." See the video and read more in the press release below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. EPA, DOE Release 2015 Fuel Economy Guide for Car Buyers The U.S.