2007 Porsche 911 Carrera 4 Coupe 2-door 3.6l on 2040-cars

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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 reveals new LMP1 racecar testing ahead of 2014 Le Mans debut

Getting ready for its triumphant return to the premier racing class of Le Mans, Porsche has released a handful of images showing its new LMP1 racecar testing. Porsche hasn't run a car in the Prototype class at 24 Hours of Le Mans since 2009, but this racecar - still veiled in secrecy - will be expected to battle against the Audi and Toyota LMP1 Prototypes to help bring Porsche its 17th Le Mans victory.
Aside from knowing that it will use a hybrid powertrain to meet LMP1 rules, there are no other details about the car... including its name or potential sponsors. In the meantime, Porsche has set up a microsite, called Mission 2014, to share its extensive history racing at Le Mans. Also, be sure to check out some of the past videos Porsche has released as it gears up for its reborn LMP1 program.

Topiary Joe sculpts the ultimate in green cars

Efficient cars are all the rage these days, but Joe Kyte has made a business of crafting some of the coolest green cars around – literally. Kyte is better known by his nickname Topiary Joe, and in addition to being a talented artist, he is also a real gearhead. Kyte has been creating topiaries for the last 20 years. It began when he was marketing greenhouse products to Walt Disney World and saw their plant sculptures. He realized that he could do that and since then, has done around 3,400 pieces. His most intriguing creations are the rolling sculptures that move and turn. Prices for those start at about $18,000 and can be as high as $30,000. While, the wheels are machine-bent, Kyte said all the other parts are done with a table vice and a Lincoln Electric arc welder. Topiary Joe is taking the Porsche (pictured above) to Palm Beach later this year to sell or says he may donate it to Porsche North America. If you really want it, the sculpture is currently on Craigslist for sale for $24,000. Topiary Joe has also had a life-long love of cars. "I was driving my first MG Midget before I was 14," he told Autoblog. He grew up in Oak Ridge, TN, where the Manhattan Project was partially developed. He says the town was full of recent college grads driving Mercedes, and he caught the bug. His automotive mentor was a nuclear physicist who taught him to repair and restore the Mercs. Kyte has completed commissions for Sandals Resort, Dreamworks, Absolut, and many more. Among his favorite creations is the Ferrari that he created at the Abu Dhabi Grand Prix that is now exhibited at the airport each year before the race. Check out his website for a wider look at his work.