most striking feature of the 997 version of the 911 is that
they are 44 mm wider over the rear arches. The Carrera 4S model,
with a 3.8-litre engine developing 355 bhp, can reach 100 km/h
in 4.8 seconds and has a top speed of 288 km/h.
The all-wheel drive system has a multi-disc viscous coupling
and transfers between five and 40 per cent of the tractive force
permanently to the front wheels. Porsche Stability Management
(PSM) has two extra functions on the 997 4S over the previous
model: the brake system is pre-filled ready for a full brake
application, thus eliminating the air gap between the pads and
the disc and making stopping distances even shorter. The second
new PSM function is activated if the driver depresses the brake
pedal quickly but not forcefully. In this situation, the hydraulic
pump builds up extra pressure to bring all the wheels into the
ABS range and ensure optimal braking.
In its regular setting, Porsche Active Suspension Management
(PASM) offers a sporty but comfortable basic shock absorber
setup, but operation of the sport button activates a noticeably
firmer mapped setting. In both settings, however, the suspension
ratings are matched at all times to the driving style and road
conditions. The active shock absorber system is a standard feature
on the 911 Carrera 4S and an optional extra on the Carrera 4.
On request, both models can also be fitted with sports suspension
to lower the body 20 mm closer to the ground; this option includes
a mechanical rear axle differential lock.