2005 Porsche Cayenne Turbo Sport Utility 4-door 4.5l 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.

Porsche's 959 is still poster-worthy after all these years

Today, we have the Porsche 918 Spyder. Before that, there was the Carrera GT. While both of those cars are dramatic departures from the traditional, rear-engine Porsche formula, they owe their very existence to another wild child of the iconic German brand - the 959.
Like so many of the great performance cars of yesteryear, the 959 was a homologation special, built just so Porsche could go racing in the clinically insane Group B rally series. Fewer than 400 959s hit the streets, but those that did were some of the most advanced cars of the 1980s. A rear-mounted, twin-turbocharged flat-six sent its power through a still-rare all-wheel-drive system, creating a race-inspired rocket that was, for a short time, the fastest production car on the planet.
Xcar has the story of the 959, from its inception to its conquest of the Paris-Dakar rally, which is interspersed with a drive of the legendary coupe. Scroll down for the full video.

Comedians In Cars Getting Coffee returns June 19, celebrates with new trailer

A brand new season of Jerry Seinfeld's Comedians in Cars Getting Coffee on the way - it will involve Seinfeld and comedian Robert Klein going to Sing Sing Correctional Facility in what appears to be a Jaguar Mark II - and the trailer is out now. In addition to Klein there'll be appearances by Sarah Jessica Parker, George Wallace, Aziz Ansari and John Stewart. We don't get to see all the rides, but a Buick Riviera GS gets some airtime and the 1949 Porsche 356/2 Gmund from the segment with Jay Leno makes a cameo. The first episode airs on June 19, you can watch the trailer by scrolling down. News Source: Crackle via YouTube Celebrities Humor Buick Jaguar Porsche Classics Videos jerry seinfeld comedians in cars getting coffee cicgc jon stewart