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Porsche 911 GT3 RS getting all-new atmospheric engine

Porsche surprised many of its most puritanical enthusiasts when it took a decidedly more usable approach with the current 911 GT3. But when the new GT3 RS debuts, it promises to be a much more extreme departure. And a big part of that comes down to the engine. At the Detroit Auto Show this week, Auto Express spoke with Porsche R&D chief Wolfgang Hatz – who also happens to be head of engine and transmission development for the entire Volkswagen group. Hatz revealed that Porsche has developed a completely new engine for the GT3 RS, and while previous rumors suggested the RS would go turbo to fill in for the lack of a GT2 (and make the most out of its displacement), Hatz confirmed that it will be naturally aspirated. Considering that Porsche rarely goes downwards when it comes to 911 engine displacement, only upwards, we'd expect the new RS to pick up where the previous 4.0 left off. The new GT3 RS is also expected to pack a more extreme suspension, aero and stripped-out interior, but those hoping for an old-school approach may be disappointed to learn that the new RS will (at least at launch) only be available with the seven-speed dual-clutch transmission – though a manual version could follow if there's enough demand. In a related development, Hatz also hinted that the Cayman GT4 could debut at the Geneva Motor Show in March, with an even more extreme approach than the previous Cayman R. The new top-of-the-line Cayman is reportedly being developed to comply with GT4 class racing regulations but be fully homologated for road use. Related Video:

Porsche undecided on new 911 GT2 [w/poll]

Fans of hardcore 911s had it pretty good with the last 997 generation. There was the GT3, GT3 RS, GT3 RS 4.0, GT2 and GT2 RS (pictured above). Each one was faster, more powerful and more expensive than the one below it, but what they all shared was what Porsche purists love most: rear engine, rear drive, a manual transmission and little else.
So far with the new 991, Porsche has only released a GT3 version. Sure, there have been other models, but they're all decidedly more luxurious and less performance-focused. And as impressive a machine as the new GT3 is, it has run the risk of alienating some of its most ardent fanatics with technological interference in the form of a seven-speed dual-clutch transmission and four-wheel steering. So what those purists have really been looking forward to is a more hardcore GT3 RS or new GT2. But those may not be coming so quickly.
Speaking with 911 project chief August Achleitner, Car and Driver reports that a new GT2 is anything but a foregone conclusion. The reasons may be partially political, but could be technical in nature as well: with 560 horsepower driving all four wheels, the new 911 Turbo S runs the 0-60 in less than three seconds. Give it more power but less traction, as Porsche has done with past GT2s, and you may not end up seeing an actual improvement in performance. A GT2 that's slower than the Turbo S would be difficult to explain.

Is Porsche planning a GT5?

A trademark application filed in Europe suggests Porsche could be planning a GT5 model to slot at the bottom of its track-focused sports car lineup. The German automaker's GT skunkworks division in Weissach earned its reputation with enthusiasts producing the GT3 and GT3 RS versions of the 911, and previously offered GT2 and even GT1 models as well (although the latter was a limited homologation special). It recently extended itself slightly downmarket with the launch of the Cayman GT4, but this trademark application – already reportedly accepted in Germany and currently being reviewed by the European office – suggests an even more accessible model could be on its way, Autocar reports. Just what form a GT5 would take, however, remains a mystery. The numerical progression would suggest that Porsche is planning a hardcore version of an even smaller sports car, if such a project ever got off the ground to slot in below the Boxster and Cayman. Given that the 911 has bred both GT2 and GT3 versions, Weissach could alternatively be planning an additional GT version of the Cayman, or planning a hardcore version of the Boxster. The prospect of a GT5 version of the Macan, Cayenne, or Panamera seems unlikely as the alphanumeric designation has never been applied to anything other than a two-door coupe, but then we never really know what the future will bring: Before 2002 Porsche had never done anything with more than two doors altogether. These designations are typically borrowed from their corresponding racing class, and of course there is no GT5 category. But then most of these racing classes have been amalgamated into GT3 anyway, unless Porsche is planning on using the name for its own entry-level spec racing series. But at this point we're just spitballing. It's just as likely that the company has simply filed the trademark application to keep its options open for the future. Related Video: