997 4S SPORT CHRONO PLUS DRIVER
This suspension available as an option on the 911 Carrera 4 comes with a more comfortable damper setting in the normal mode, but switches immediately to a particularly firm and taut set-up as soon as the driver presses the sports button. This difference results from the ground clearance of the S-model lowered by 10 millimetres or almost 0.4 inches and therefore offering even better all-round aerodynamics thanks to the standard use in this case of PASM Porsche Active Suspension Management. Simply outstanding: aerodynamics and suspensionĭespite the two wheel arches bulging out as genuine signs of power over the rear axle, the aerodynamic qualities of the new models in the 911 range remain truly outstanding: The drag coefficient of the 911 Carrera 4 is Cd = 0.30, with the Carrera 4S boasting an even more impressive Cd = 0.29. The second point is that PSM also intervenes in a critical situation: If the driver presses down the brake pedal quickly, but not hard enough, the hydraulic pump will build up the extra pressure required in order to activate the ABS control mode on all four wheels and thus ensure optimum brake power. The two four-wheel-drive models proudly boast modified Porsche Stability Management (PSM) comprising additional functions: The first point is that the brake system is filled prior to application of the brakes all-out, which eliminates the usual air gap between the brake pads and the brake disc, and makes stopping distances even shorter.
Porsche Stability Management with even faster brakes The front axle final drive, in turn, is fundamentally the same as on the former four-wheel-drive models, now however coming with a modified transmission ratio due to the larger tyres differing in size. The central distribution of power in the Carrera 4 and Carrera 4S is provided by the viscous multiple-plate coupling.
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