The building block for the car’s explosive performance is an updated version of the 5.0-liter supercharged V8 engine, which produces 550 hp and 502lb-ft of torque. These figures represent a power increase of 40 hp (8 percent) and torque increase of 41lb-ft (9 percent) over the Jaguar XKR. Driving the rear wheels through a six-speed automatic gearbox and an Active Differential, this propels the XKR-S Convertible to 60 mph in 4.2 seconds (0-100 kmh in 4.4 seconds) and up to an electronically limited top speed of 186 mph.
The inherent engineering integrity of the acclaimed Jaguar AJ-V8 engine, now in its third generation, meant that Jaguar engineers could derive the extra power and torque needed for the XKR-S. The advanced design of the quad-cam, all-aluminum 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.
Liberating an extra 40 hp over and above the XKR entailed remapping the fueling characteristics and increasing exhaust gas flow through the use of an active exhaust system.
With the convertible top lowered, the Performance Active exhaust system delivers an authentic, motorsports inspired soundtrack that has been tuned to provide the driver with a thoroughly exhilarating driving experience.
Jaguar pioneered the use of aluminum in series production cars. The low mass and high tensile strength of aluminum helps give the XKR-S torsional rigidity of 16,500 Newton meters per degree. With the XK model designed as a convertible from the outset, Jaguar engineers were able to apply the changes that created the XKR-S Coupe into the open-top GT without compromising performance, agility or refinement. Supporting this potent engine performance is a comprehensive package of suspension upgrades which refine the XK model’s dynamic abilities further, creating an intimate connection between the car, the driver and the road.
Both front and rear suspension systems have been revised. A new aluminum steering knuckle in the front double wishbone suspension increases camber stiffness by 23 percent to provide even greater levels of steering accuracy and feedback. To increase stability and control, the Active Differential has been uprated to reduce steering sensitivity at high speeds.
Rear damper top mounts have been stiffened, while the rear wheel steer effect has been optimized for agility. Spring rates front and rear have been increased by 28 percent while a bespoke Adaptive Damping program for the XKR-S maximizes body control, traction and grip.
Unsprung mass has been reduced by nearly five percent through the fitment of lightweight, forged alloy wheels, which also offer greater traction and grip levels thanks to wider rear tires that were specifically developed for use on the XKR-S and serve to increase the size of the tire contact patch. The XKR-S convertible rides on Pirelli® PZero® tires (255/35 ZR20 at the front and 295/30 ZR20 at the rear).
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