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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.

Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

Porsche 911 going all-turbo this year save for GT3 and GT3 RS

The coming Porsche 911 GT3 RS will represent another high-water mark for the brand, and another milestone. Its 500-or-so horsepower and extreme aero are predicted to lop more than five seconds off the 7:20 Nurburgring lap time of the current GT3, making it "comfortably less" than 7:20. Beyond that, its naturally-aspirated 3.8-liter will form the basis of the turbocharged engines going into the standard range of 911s later this year as 2016 models. That's right – if you're looking for a sub-GT3 911 that gulps its air without compressed assistance, then you've only got a few months to get a new one into your garage. Emissions regulations are the reason, of course, with Porsche's R&D chief Wolfgang Hatz saying that, "Every new model will have lower CO2 than before," and "if you look at euro per g/km, then it's turbo." We don't know what the engine lineup will look like, however; a few months ago Car reported that the base 911 would get a smaller-displacement version of the engine, while the S would stick with 3.8-liter displacement and jump to 520 horsepower, which is the same as the current Turbo. After that, Hatz said, "at the end of the decade electrification has to be the next huge step." That means a hybrid 911 is being cooked up somewhere. Yet even as the brand leaps into the new, there's a chance it could dip a toe back into the old: the 911 GT3 RS will launch with a PDK, but Hatz's team is considering adding the option of a seven-speed manual. Elsewhere in the range, the Cayman GT4 is being engineered by Porsche Motorsport as an entry-level racer, with more power than the current Cayman GTS to go with some serious weight loss. They are also developing a track-only model for privateers. The standard Boxster and Cayman will get turbocharged flat-four engines, but there'll be a sporty Boxster that also loses weight and gets more power than the 325-hp Boxster GTS. And that mid-level supercar that's been floating in the ether for years and supposedly sent to purgatory again just last November? It's on the way by 2020 "at the latest," and will use a version of the new V8 that will eventually go into the Cayenne and Panamera. Featured Gallery 2015 Porsche 911 GT3 RS: Winter Testing Spy Shots View 13 Photos News Source: Top Gear, AutocarImage Credit: CarPix Green Porsche Emissions Convertible Coupe Hybrid Luxury Performance Supercars porsche 911 gt3 wolfgang hatz porsche supercar