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What's one way to distinguish the 996 Turbo (top) from the new 997 Turbo pulling away from you on the highway? Note the new trapezoidal exhaust openings and tips poking through the lower fascia, rather than tucked under the rear trim.
Building on the wide-bodied appearance of the recently introduced 4S, the 997-series Turbo declares itself with a unique front bumper carrying high-intensity LED indicators and parking lights integrated into a horizontal bar running across the outer air ducts. The fog lamps are set low on the corners within special housings designed to protect them from stone damage.
Along the flanks, sills under the doors are more pronounced and sizeable air ducts ahead of the rear wheel arches provide efficient cooling. Changes to the rear include the adoption of a reshaped biplane wing assembly that Porsche says will provide added levels of downforce, and a bumper with small ducts to pull hot air out of the engine bay. Completing the makeover, lightweight 19-inch alloy wheels wear ultra-low-profile tires, accentuating a significantly lower ride height than standard 911 models.
Behind the Turbo’s distinctive look is a more powerful version of Porsche’s twin-turbocharged 3.6-liter six-cylinder engine. High-level Zuffenhausen sources say the powerplant is derived from the outgoing model’s engine, which itself evolved from Porsche’s Le Mans-winning 911 GT1 sports car program.
We’ve heard reports of power outputs of up to 500 hp—a massive 80-hp or 19 percent increase above the outgoing model’s 420 hp. The company’s habit of incremental improvement suggests the figure could be significantly lower, though with others advertising 500 hp, Porsche must be tempted to respond. Nothing is official just yet, but we’re told to expect a subtle 30-hp gain, taking the new model up to 450 hp (the same power obtainable by adding a Porsche X50 power kit to today’s 911 Turbo S—perhaps a similar option will be offered on the new model).
The Turbo’s torque figure also rises by about 30 lb-ft to 457 lb-ft. Drive goes to all four wheels via a standard six-speed manual unit or a new double-clutch automatic gearbox, and Porsche’s familiar full-time awd system.
Key to the increased output is Variable Turbine Geometry technology for the two turbochargers. Common on high-performance diesel engines, VTG continuously adjusts the angle of the turbocharger’s vanes to provide a more linear delivery of power and wider spread of torque. To make this work on gasoline engines, with much higher exhaust temperatures than diesel units, the BorgWarner-developed turbos employ heat-resistant ceramics. The engine also benefits from improved variable intake and exhaust valve timing.
Even with the added weight, the 997 Turbo gains in power-to-weight ratio and should be able to hit 60 mph in well under 4.0 seconds with a top speed of 190 mph.
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http://www.autoweek.com/printwindow....;pageType=news
Edited by - mpollard on 12/16/2005 01:06:45 AM
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