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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.

Porsche issues stop-sale on Cayenne Diesel in US

As reported yesterday, the ongoing Volkswagen diesel emissions scandal has expanded to the VW Group's 3.0-liter TDI V6 engines. The Environmental Protection Agency's finding implicate many engines used by Audi and Porsche, including Porsche's only US domestic market diesel offering: the Cayenne. And after putting two and two together, Porsche has issued a stop-sale on its US-market Cayenne diesels. Porsche's statement is terse. They refer to the EPA's findings as "unexpected," and stress that its stop-sale order is "voluntary." And Porsche assures owners that they can continue to drive their Cayennes as per normal, like the rest of the VW Group vehicles called into question for NOx emissions. The stop-sale order will remain in place indefinitely, until Porsche can "resolve" the issue. No word as of yet as to what the fix will be for the 3.0-liter TDI engines. Porsche Cars North America Statement Regarding Voluntary Stop Sale of Porsche Cayenne Diesel Vehicles ATLANTA, Nov. 3, 2015 /PRNewswire/ -- Porsche Cars North America, Inc. today decided, in view of the unexpected U.S. EPA notice received yesterday, to voluntarily discontinue sales of model year 2014 through 2016 Porsche Cayenne Diesel vehicles until further notice. We are working intensively to resolve this matter as soon as possible. Customers may continue to operate their vehicles normally. About Porsche Cars North America, Inc. | One Porsche Drive, Atlanta, GA 30354 USA Established in 1984, Porsche Cars North America, Inc. (PCNA) is the exclusive U.S. importer of Porsche 918 Spyder, 911, Boxster and Cayman sports cars, the Macan and Cayenne SUVs, and Panamera sports sedans. Headquartered in Atlanta, Georgia since 1998, PCNA is also home to the first Porsche Experience Center in North America featuring a module-based 1.6 mile driver development track, business center, human performance center, and fine dining restaurant. PCNA employs approximately 300 people who provide parts, service, marketing, and training for 186 dealers. They, in turn, work to provide Porsche customers with a best-in-class experience that is in keeping with the brand's 65-plus year history and leadership in the advancement of vehicle performance, safety and efficiency. PCNA is a wholly-owned subsidiary of Porsche AG, which is headquartered in Stuttgart, Germany. At the core of this success is Porsche's proud racing heritage that boasts some 30,000-plus motorsport wins to date.

A few pre-race notes and a lot of photos from the 24 Hours of Le Mans

The 82nd running of the 24 Hours of Le Mans is on.
Audi has won 12 of the last 15 events, the scion of Auto Union is trying to make it 13 this year. To do so, it will have to overcome a situation faced only three other times during its dominance of La Sarthe: underdog status. Toyota has won the first two races of the year and claimed pole for this race, the rumor being that this year it's Toyota's race to lose.
And then there's Porsche. It's been 16 years since the Stuttgart brand raced on the top rung at Le Mans, three years years since it announced its return, just a year since it acquired Mark Webber in a signing that wasn't subtle and a few months since we got eyes on the 919 Hybrid.