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Porsche offering new tire option for Carrera GT

Let's face it: finding new tires for older cars can be challenging if tire manufacturers have stopped carrying the right sizes (this writer went through Hell to find a set of 205/60-13s). But what about tires for low-volume supercars, which use sizes that often won't fit on high-volume production vehicles? The Porsche Carrera GT isn't that old and tires are still available in the correct sizes, but the German automaker has shown its support of keeping them on the road by working with Michelin to give owners yet another tire option. Enter the Carrera GT-specific Pilot Super Sport.
It's common knowledge that tires are one of the most important pieces of the performance puzzle, and Porsche claims that the PSS tires, sized 265/35ZR-19 front and 335/30ZR-20 with Porsche's "N0" rating, will improve the Carrera GT's handling and stability all the way up to its claimed top speed of 205 miles per hour. That's important for a car with razor-sharp handling characteristics. They'll also net drivers a 10-percent increase in fuel economy on regular roads and up to 20 percent on racetracks, Porsche says.
The PSSs use cutting-edge tire technology to harness the Carrera GT's 610-horsepower. They have a dual-compound tread that's different from the inside of the tire to the outside, which, Porsche says, helps steering precision and increases maximum grip. Aramid fibers, which are lightweight but just as strong as steel, are used in the tire's belt to reduce unsprung weight.

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.

Techart Porsche 911 Targa 4S is a tuner's attempt at being tasteful

We've not been terribly nice to the aftermarket tuners of the 2015 Geneva Motor Show. That's largely because they don't deserve our kindness. Techart, though, is not going to be the subject of derision, largely because aside from painting this Porsche 911 Targa a particularly lurid shade of yellow (and finding seat upholstery and trim to match), the changes aren't particularly offensive. Hell, paint it black, silver or red, and it'd just look like a more aggressive Porsche. That's largely because it is. Techart has behaved itself, fitting a brand new body kit featuring a new rear spoiler, diffuser, front splitter and side skirts, and replacing the much of the interior componentry with carbon fiber and aluminum components. The tuner doesn't mention the exact name of the shade used both inside and out on this Targa, although those with more conservative tastes will rest easy knowing that "stylistic harmony with standard or Techart individual paint is guaranteed." Techart's deft aesthetic treatment hides a similarly light tweaking under the sheetmetal. This car features a new exhaust system, complete with four staggered exhaust pipes that have been finished in black chrome. And that's it. There aren't 17 turbos or a new intake manifold crafted from free-range ivory. It's the same 400-horsepower flat six found in a normal Targa 4S. Techart has fitted its own springs, although it doesn't tell us how much (or even if) the ride has been lowered. 21-inch alloys round out the more practical changes. Check out our full gallery of live images of Techart's latest creation, direct from Geneva. Related Video: News from the TECHART world 03.12.2014 TECHART for the Porsche 911 Targa 4 models Closed roof – open driving pleasure. TECHART Automobildesign sharpens the character of the seventh Porsche 911 Targa 4 generation. Using the right mixture of restraint and emphasis the TECHART Aerodynamic Kit transfers the sportive TECHART design language to the unmistakable lines of the four-wheel drive sports car. TECHART Formula IV light-alloy wheels in 21-inch communicate aesthetic innovative capacity all around. Interior refinement specialists of the TECHART in-house saddlery use precise handiwork to translate the exterior design elements stylistically into the vehicle's interior. TECHART Aerodynamic Kit for die Porsche 911 Targa 4 models. Porsche 911 silhouette. Wide body with active taillight strip. And of course a glass roof with iconic aluminium bar.