Porsche Boxster S
From Porsche press: In 1948, the 356 was the first sports car to bear the Porsche name, and in July that year the lightweight mid-engined roadster achieved its first motorsport victory. In 1953, the Porsche 550 Spyder was launched. This agile, lightweight race car was powered by a high performance ‘boxer’ engine which took it to countless international victories.
The highlight of the new generation is the new flat-six ‘boxer’ engines, developed with new technical features from the ground up, providing not only more power, but also significantly greater fuel efficiency.
Displacing 2.9-litres, the engine of the Boxster develops 255 bhp (188 kW) in the Boxster, an increase of 10 horsepower over the prior 2.7-litre model. The 3.4-litre power unit in the Boxster S now features Direct Fuel Injection, and delivers 310 bhp (228 kW), up by 15 bhp. An impressive power-to-weight ratio imbues the two Boxster models with optimum driving dynamics.
For example, with the new six speed manual transmission fitted as standard, the Boxster accelerates from 0-62 mph (100 km/h) in 5.9 seconds. And the Boxster S, when fitted with PDK transmission and Launch Control (featured in the optional Sports Chrono Package Plus), accelerates from 0-62mph (100km/h) in 5.0 seconds. When combined with PDK, the new 2.9-litre engine fitted to the Boxster clearly breaks through the 30.0mpg fuel consumption boundary. Indeed, the figure of 31.0mpg (9.1 litres/100km) is approximately 10 per cent better than the previous model with the Tiptronic S automatic transmission.
Increasing fuel economy by an even more significant 15 per cent to 30.1mpg (9.4 litres/100km), the 3.4-litre Boxster S with PDK offers an even greater saving over its predecessor with Tiptronic S. In parallel with the improvement in fuel economy, so emissions of the engines have decreased also. Depending on model, emissions have been reduced by up to 16 per cent.
The Boxster with the standard six-speed manual gearbox emits 221g/km CO2, and 214g/km CO2 when fitted with PDK. The Boxster S manual emits 223 g/km CO2, and 221 g/km CO2 with PDK. Significantly, these developments move every Boxster model – whether manual or PDK – into Band F for Vehicle Excise Duty and company car taxation purposes.
The driver benefits from a further advantage of direct injection every time they touch the throttle pedal: with fuel being injected fractions of a second prior to combustion, the engines respond more directly and spontaneously to even the slightest movement of the driver’s right foot.
This is not only the case when accelerating, but also when lifting off the throttle, for engine speed drops more quickly and smoothly since there is no residual fuel left in the intake manifold which might otherwise prolong the combustion process. Depending on engine load and speed, fuel is injected into the combustion chamber at a pressure of 120 bar. The big advantage is that unlike conventional intake manifold injection, direct fuel injection serves to form the fuel/air mixture directly in the combustion chamber. This better mixes the air and fuel in the cylinder, establishing an important prerequisite for clean and complete combustion.
This ensures the ‘homogeneous’ operation of the power unit with a consistent balance of the fuel/air mixture in the combustion chamber at all times and under all running conditions. Such smooth operation guarantees optimum combustion and maintains low emissions, across a range of fuel qualities.