Automotive Intelligence - the web for automotive professionals and car enthusiasts
November 21, 2011
The lightweight aluminium structure of the XK has huge torsional rigidity, allowing the fitment of suspension components such as a redesigned aluminium front steering knuckle and revised rear geometry, stiffer springs and dampers. Allied to lightweight forged wheels and recalibrated steering settings this has allowed Jaguar's vehicle dynamics experts to create a supremely agile, connected driving experience with no loss in refinement.
Reflecting the car's uprated dynamic abilities are interior and exterior styling changes. Externally the XKR-S Convertible is dramatically differentiated from other XK models with carefully calibrated aerodynamic aids that allow it to perform flawlessly at very high speeds.
This sense of drama is continued inside the car with Jaguar Performance seats that feature increased support for driver and passenger during high-speed cornering. The seats are finished in carbon leather and feature 16-way adjustment and heating while carbon is also used to trim the cabin and emphasise the car's assertive nature.
The engineering integrity of the acclaimed AJ-V8 petrol engine, now in its third generation, meant that Jaguar's engineers could derive the extra power and torque needed for the XKR-S. The advanced design of the quad-cam, all-aluminium AJ-V8 incorporates spray-guided direct injection and variable valve timing for great efficiency as well as prodigious power. The Roots-type twin-vortex supercharger nestling in the 'V' of the engine has twin intercoolers and is 20 percent more thermodynamically efficient than its predecessor.
The result is 550PS and 680Nm, allowing the XKR-S Convertible to accelerate from a standstill to 60mph in just 4.2 seconds (0-100km/h in 4.4 seconds) and on to an electronically limited top speed of 186mph (300km/h).
Liberating an extra 40PS and 55Nm over and above the XKR entailed remapping the fuelling characteristics and increasing exhaust gas flow though the use of an active exhaust system.
With the roof lowered on the XKR-S Convertible the Performance Active exhaust system delivers an authentic, race-car inspired soundtrack that has been tuned to provide the driver with a thoroughly exhilarating driving experience.
(Nov 16, 2011)