2014 Nissan Sentra S 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.

Renault invests in sailing ships to reduce its carbon footprint

Renault is taking a page from the golden age of sailing as the company looks towards reducing its carbon footprint through the use of cargo sailing ships. The French automaker recently announced its partnership with Neoline, a start-up enterprise based in the west of France. The firm specializes in reducing the cost and emissions of typical cargo ships, by reintroducing sailing into the transportation equation. Renault's goal is to reduce its global carbon footprint by 25 percent in 2022, as compared to where they were in 2010. This plan also includes a separate target, to lower supply chain emissions - which includes shipping methods such as trucks, trains, and cargo ships - by 6 percent, compared to levels in 2016. Two prototype cargo vessels, complete with a full set of sails, will be introduced by 2021-22. These two ships will travel between the U.S. eastern seaboard (exact locations are TBD) and the French port cities of Saint-Nazaire and Saint-Pierre & Miquelon. Specifics about what exactly the ships will be carrying has not been released, though Renault is part of an extensive global auto alliance that includes Nissan and Mitsubishi. "For nearly 10 years, we have been working to identify the most environmentally sustainable solutions," said Jean-Francois Salles, Alliance global director, production control. "For example, optimizing the fill rates of the containers and trucks, producing eco-friendly packaging, and implementing a multi-modal system." The current demonstration vessel measures in at 446 feet in total length and has more than 45,000 square-feet of sail. For all you big ship fans out there, the Titanic was about double this size, stretching about 882-feet in length. When powered solely by the wind, Neoline CEO, Jean Zanuttini, says that total emissions drop by as much as 90 percent, versus the carbon footprint of a traditional cargo vessel. Related Video: Green Mitsubishi Nissan Renault Green Culture Technology renault-nissan greenhouse gases shipping ship cargo ship

Renault's push for more affordable EVs has global implications

The Renault K-ZE is a small electric car that signals a big change in how the French automaker plans on bringing electric vehicles to the masses. Set to go on sale in China beginning in 2019, the K-ZE is meant to have the design of a sport-utility vehicle, but it's on a supermini-sized frame. While it's set to arrive in Europe by 2021, this petite EV could eventually impact electric sales here in the U.S., too. That's because Nissan, maker of the Leaf EV, is part of the Renault-Nissan-Mitsubishi Alliance, a three-pronged automaker with a huge global presence. In China, however, the Renault brand has been absent from the country's booming market for electric vehicles — driven in large part by government mandates to combat air pollution by promoting cleaner, zero-emission cars and trucks in cities. Speaking ahead of the K-ZE's debut this week at the 2018 Paris Motor Show, Carlos Ghosn, the chairman and CEO of Group Renault, stated the company "was a pioneer and is the European leader in electric vehicles." To this, he added the K-ZE is meant to have global reach and bring costs down for the consumer. "We are introducing Renault K-ZE, an affordable, urban, SUV-inspired electric model combining the best of Groupe Renault: our leadership in EV, our expertise in affordable vehicles and in forging strong partnerships," said Ghosn. In China, the K-ZE will be manufactured as part of a joint partnership in cooperation with Renault, Nissan and the Chinese automobile firm Dongfeng Motor Group. The range of the K-ZE is expected to be about 150 miles per charge, or roughly the current range in the 2018 Leaf EV. Except the K-ZE is almost three feet shorter than the Leaf, which means Renault is getting a lot more range from a smaller and lighter amount of batteries. While a car this size would be too small for the U.S. market, the technology beneath this teeny hatchback/SUV is certain to make an appearance here in the years ahead. At the 2018 Geneva Motor Show, Nissan provided a hint of its future European EV plans, courtesy of the IMx Kuro Concept. This edgy-looking electric crossover is a good indication as to the design direction of Nissan's next range of electric crossovers and SUVs over the next 3-5 years — look for the design and tech to similarly migrate stateside.