Porsche’s two-seat roadsters offer unique blend of mid-engined handling in thoroughly useful two-trunk ragtop package. The biggest news for the 2007 Boxster lineup is new powerplants in the already award-winning drop-tops. The Boxster S receives the 3.4-litre flat-six engine from the Cayman S with an identical 295 horsepower rating. The Boxster receives a reworked version of the 2.7-litre Boxer mill rated at 245 horsepower—only 5 less than the original Boxster S. Both engines are now fitted with Porsche’s VarioCam Plus variable intake-valve timing and lift system, which broadens the engines’ torque curves, increases fuel economy, and helps reduce emissions. Also new for ‘07 on the Boxster lineup is a revised an updated Tiptronic S automatic transmission, a standard Tyre Pressure Monitoring System (TPMS), a reworked positioning of the service tray to improve the shape of the rear trunk, and optional new 19-inch wheels from the 2007 911 Turbo.

New engines for more power in a capable chassis
Providing power for the 2007 Boxster S is the new 3.4-litre “Boxer” six-cylinder engine from the Cayman S. While based on the 3.2-litre engine in the 2006 Porsche Boxster S, this engine wears the cylinder heads and uses the same VarioCam Plus technology as the venerable Porsche 911 Carrera. A combination of adjustable valve timing and variable valve lift on the intake camshaft. VarioCam Plus carefully manages camshaft and valve lift to constantly make adjustments to optimise power output, resulting in 295 horsepower and 251 foot-pounds of torque. This helps propel the “07 Boxster S from a standing start to 60 miles per hour (96 km/h) in just 5.1 seconds. The Boxster S will reach a top test-track speed of 169 mph (272 km/h). The engine’s efficiency also shows in its emissions, as it qualifies as an LEVII (low-emission category two) vehicle in the United States, and in its fuel economy rating of 20-mpg city and 28-mpg on the highway. In addition to its short stroke and VarioCam Plus technology, the new engine benefits from newly developed crankshaft, main bearings and pistons. The crankshaft in the Boxster S shares dimensions with that in the 911 Carrera and the aluminium crankcase is virtually identical to that used in the Porsche flagship.

Gearing up the Boxster and Boxster S
The 2007 Boxster employs a standard five-speed manual gearbox and can be optioned with the six-speed manual that is standard equipment on the Boxster S. The six-speed manual, like the five-speed manual, has reinforced synchromesh rings on all gears. Multiple synchromesh rings assures quick and easy shifts even with short shifter travel. The five-speed manual features triple synchromesh on first gear and double synchromesh on second. The six-speed has triple synchromesh on first and second gears and double synchromesh on third, fourth, fifth and sixth. As on the 911 Carrera, the synchromesh rings in first and second gear on both Boxster manuals have a wear-resistant carbon coating.

An automatic choice: Tiptronic S
New for 2007 and optional on either the Boxster or Boxster S is the revised and updated Porsche Tiptronic S five-speed automatic transmission, which allows for manual gear changing via fingertip controls located on the crossbar of the steering wheel. For 2007, the Tiptronic S available in the Boxster has been upgraded with new hydraulics and electronics as on the 911 series and Cayman S. This transmission’s refinements are best utilised when combined with the optional Sport Chrono package, which when engaged allows for variable shift patterns, which include more aggressive downshifts, quicker shift times, and the ability to hold gears against the rev limiter.

Enhanced braking system
The Boxster and Boxster S are equipped with cross-drilled disc brakes at each wheel. Like all Porsche vehicles, brakes undergo extreme testing both for stopping power, durability and resistance to fading. On the Boxster, front brakes are 11.73 inches (298 mm) in diameter and 0.94 inches (24 mm) thick while the rear brakes are 11.77 inches (299 mm) across and 0.79 inches (20 mm) thick. The more powerful Boxster S gets even larger front brakes: 12.52 inches (318 mm) by 1.1 inches (28 mm) while the rear brakes are 11.77 inches (299 mm) by 0.94 inches (24 mm) thick. Both cars have four-piston aluminium monobloc callipers and anti-lock braking technology. The Boxster and Boxster S use a mechanically driven vacuum pump that supplies pressure to the brake servo instead of a conventional suction jet pump within the engine intake manifold. Driven by the exhaust cam on the right-hand cylinder bank, the pump provides a high and consistent level of power, even in low ambient air pressure or high altitude conditions and during highly dynamic driving conditions under mostly open throttle.

Sport Chrono Package Plus
Available as an option on the Boxster and Boxster S is the Sport Chrono Package Plus that allows the driver to engage more aggressively set electronic management system control maps. This feature also includes a separate stopwatch gauge on top of the instrument panel.

Source: Porsche Press Releases

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