The Jaguar XKR Shas been properly unveiled with full specs, hi-res photos that show the automaker’s fastest series production sports car in all its beauty.
Fitted with a more capable 5.0-litre V8 engine under its vented bonnet, the Jaguar XKR S is now able to develop 550 PS and 680 Nm of torque which get put to work by a 6-speed automatic transmission. Accelerating from 0 to 60 mph takes 4.2 seconds (0 to 100 Km/h in 4.4) and a if the driver chooses to keep pressing the acceleration pedal, then a maximum speed of 186 mph (300 Km/h) can be reached.
As far as consumption the Jaguar XKR S returns 23 mpg combined, (12.3-litres per 100 Km) while the NEDS combined CO2 levels are 292 grams per Km.
The Jaguar XKR S has a gross weight of 1,800 Kg and besides featuring a series of design elements that make it appear more aggressive, the British sports car has also received a 10 mm lowered suspension, stiffer springs, high performance brakes, a new stability control software, and 20 inch Vulcan wheels wrapped in Pirelli P Zero tires. 
Jaguar press release :
At A Glance
1.     The most powerful and fastest series production sports car Jaguar has ever built with a top speed of 300kph.
2.     Heads the XK range with an expected on-the-road price of £97,000 when ordering opens in September.
3.     The ultimate expression of Jaguar’s sports car strategy; offering intelligent performance with everyday driveability.
4.     Uprated supercharged AJ-V8 Gen III R direct-injection engine produces 550PS and 680Nm of torque.
5.     Maximum speed raised to 186mph (300kph) with 0-60mph reached in just 4.2 seconds.
6.     The only car in its class to emit less than 300g/km of CO2.
7.     Active sports exhaust delivers an authentic, race-car inspired soundtrack.
8.     Exploits the XK’s strong, lightweight advanced aluminium body architecture to maximise performance, agility and economy.
9.     Bespoke suspension changes front and rear for ultimate precision, control and driver appeal.
10.  Unique styling changes incorporate Computational Fluid Dynamics
calculations in order to reduce lift and maximise aerodynamic stability.
11.  Revised interior features 16-way adjustable memory sports seats with carbon-fibre effect leather.
12.  Reprogrammed Adaptive Dynamics allow the enthusiastic driver to explore the outer edges of the handling envelope.
13.  Jaguar’s performance flagship competes in the sub-exotic segment, new territory for the company.
Introduction
Making its debut at the Geneva Motor Show 2011, the XKR-S is the most
extreme expression yet of Jaguar’s passion for building beautiful, fast
cars. For the first time with a series production car, Jaguar gains
entry to the exclusive ‘300kph club’ thanks to the effortless
performance of the supercharged 5.0-litre AJ-V8 engine. A revised
fuelling map means the direct-injection powerplant now produces 550PS
and 680Nm of torque. Extensive recalibration has ensured that power
delivery and performance are seamless, contributing to a 0-60mph time of
4.2 seconds. The Performance active exhaust encourages and rewards the
enthusiastic driver with dramatic, motorsport-inspired aural feedback.
The XKR-S is not merely the quickest Jaguar ever but also the most
agile, responsive and driver-focused. The pinnacle of the XK range
builds on feedback gathered from the supercharged XKR and has been
developed to extend the performance parameters of the car. This new
harder-edged character allows the enthusiastic driver to explore the
outer limits of the car’s dynamics without losing the refinement and
usability for which Jaguar is famous. The structural integrity of the
lightweight aluminium platform allowed the suspension to be reworked
with bespoke components for increased stiffness without a commensurate
loss in either refinement or Jaguar’s legendary ride comfort. A reworked
aluminium front suspension knuckle and revised rear geometry are allied
to stiffer springs and dampers, lightweight forged alloy wheels and
recalibrated steering effort to minimise any response delays and produce
a more connected and agile driving experience. 
The performance of the XKR-S is reflected in both its interior and
exterior styling, which feature exclusive new paint colours that reflect
Jaguar’s racing heritage. As with competition Jaguars of the past, the
exterior of the XKR-S adheres to the principle of form following
function. In addition to the styling changes and in order for it to
achieve 300kph, the XKR-S was the subject of extensive Computational
Fluid Dynamics development work. The resulting changes reduced front and
rear lift by more than a quarter and optimised lateral aerodynamic
stability.
The performance intent of the XKR-S is clear from the moment the
driver enters the cabin thanks to new cosseting Performance seats with
prominent shoulder wings for close support during hard cornering. The
seats feature 16-way adjustment, memory and heating functions while a
new three-spoke steering wheel provides the perfect interface between
car and driver.
Styling

  • Unique, new front-end design with twin nacelles, side intakes and carbon-fibre splitter.
  • Extended side sills emphasising the 10mm lower ride height.
  • New rear apron incorporating a carbon-fibre diffuser.
  • Unique to the XKR-S is a rear wing with carbon-fibre centre section.
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Ian Callum, Design Director, Jaguar Cars: “The styling of this
car isn’t about image, it’s about true performance. Like other iconic
Jaguars before it, the styling has been driven by geometry and
aerodynamics for genuine design purity. The physics required to achieve
300kph have led the aesthetic; if you don’t like the way it looks, you
probably won’t like the way it drives either.”

The first Jaguar designed entirely under the aegis of Design Director
Ian Callum, the XK has received awards worldwide for its elegant
appearance. Now further styling changes keep the XKR-S at the forefront
of modern sports car design. Slimmer, LED headlights, more compact main
air intake and vertical side power vent all contribute to a more
purposeful front-end appearance. At the rear of the car the famous
Jaguar ‘Leaper’ now takes pride of place in the centre of the bootlid.
The XKR-S also required aerodynamic modifications to achieve its
300kph top speed in the unruffled manner expected of a Jaguar and has
been designed solely with an eye for purity of line and singularity of
purpose. As the XKR-S approaches its top speed, there is a requirement
to channel air cleanly over, around and under the car in order to
maintain stability and ensure balanced downforce front and rear. An
overall reduction in lift of 26 per cent has been achieved.
The necessary revisions were made after extensive Computational Fluid
Dynamics work, proven through wind tunnel testing and are unique to
this flagship of the XK range. The most dramatic changes have been
applied to the front of the car, radically altering its appearance and
lending it a more assertive look. A new bumper design features near
vertical feature lines running down from the edges of the oval air
intake and supporting the new carbon-fibre splitter and lower spoiler.
At the extreme edges of the front fenders, vertical slots channel air
down the sides of the car and along the wider sills for increased
high-speed directional stability.
In order to balance front and rear lift, the XKR-S features a
separate rear wing, a first for the XK range. This addition, with its
carbon-fibre centre section, works in concert with the similarly
constructed Venturi structure underneath the rear bumper.
The assertive new appearance of the XKR-S is subtly highlighted by
some carefully chosen details exclusive to this model. Exterior trim is
finished in gloss black, complemented by 20-inch Vulcan lightweight
forged alloys in a dark technical finish.
The XKR-S is available in a range of five paint colours, two of which
evoke Jaguar’s competition heritage: Italian Racing Red and French
Racing Blue.
Like the lining of a bespoke suit, the finishing touch is provided by
the brake calipers, available in either red or gunmetal and emblazoned
with the ‘Jaguar’ name.
Performance/Powertrain

  • Third generation of the award-winning AJ-V8 all-aluminium powerplant with twin-vortex Roots-type supercharger.
  • Revising the fuelling map boosts power and torque to 550PS and 680Nm.
  • Spray-guided direct injection delivers precisely measured quantities of fuel into the cylinder heads at 150bar.
  • Variable timing system on all four camshafts features actuation rates of more than 150 degrees per second.

Russ Varney, Chief Programme Engineer, XK: “With the XKR-S we
have exploited the inherent capabilities of the aluminium architecture
to its fullest extent to create a track-capable performance derivative
extending all car’s attributes and delivering an irresistible ‘smile of
satisfaction’ response from the driver.”

Astonishing engines have always formed the strongly beating heart of
Jaguar’s road and race cars from the record-setting straight-six in the
XK120 to the smooth V12 that made the XJ12 the fastest four-door in the
world when it was launched.
The AJ-V8 joined this illustrious list from the moment the first one
was fired into life but in the XKR-S it is presented in its most potent
form to date. Now in its third generation and with the addition of
supercharging, the all-aluminium quad-cam powerplant delivers not only
extreme performance but also tremendous efficiency thanks to the
technologies incorporated into it, including spray-guided direct
injection (SGDI) and dual independent variable cam timing (DIVCT).
Fuel is delivered directly to the centre of the combustion chambers
at a pressure of up to 150bar by the centrally-mounted six-hole
spray-guided injection system in order to maximise fuel-air mixing and
improve responsiveness, particularly at low speeds. It has also allowed
an increase in compression ratio from 9.1:1 to 9.5:1 to improve fuel
economy while multiple injections reduce the warm up phase to increase
catalyst efficiency and reduce emissions.
Each of the four camshafts features a variable timing system which
rather than being controlled by oil pressure, are activated by the
positive and negative torques generated by the movement of the intake
and outlet valves, allowing for a smaller, more efficient oil pump to be
fitted, further reducing fuel consumption. The VCT units respond up to
three times faster than previously with actuation rates of more than 150
degrees per second at every point in the speed range, making this the
most responsive engine Jaguar has ever built, with no gaps in its power
delivery.
Like the car itself, the AJ-V8 features aluminium architecture with
the high pressure die-cast lightweight block augmented by cast iron
liners and cross-bolted main bearing caps which contribute to refinement
to match its power. The four-valve cylinder heads are now constructed
from recycled aluminium to reduce the environmental impact of engine
manufacture.
Nestling in the ‘V’ of the cylinders is the Roots-type twin vortex
supercharger and its two intercoolers that help provide the XKR-S with
such urgent motive power. This sixth-generation forced induction unit is
20 per cent more thermodynamically efficient than its predecessor,
while the intercoolers feature their own water-cooling circuit to reduce
the temperature of the pressurised air to optimise power and
efficiency.
The surfeit of power produced by this system meant that it was a
relatively simple matter to liberate an extra 40PS and 55Nm over the
standard XKR. Remapping the engine’s fuelling characteristics and
increasing exhaust gas flow through the use of an active exhaust system
has lifted total output of the 5.0-litre V8 is now 550PS and 680Nm,
making it the most powerful Jaguar road engine ever made and allowing
the XKR-S to hit 60mph in 4.2 seconds and breach the magical 300kph
barrier with ease.
The Performance active exhaust system that helps provide such
spirited performance also produces a thrilling motorsport-inspired
soundtrack to aurally reward the enthusiastic driver.
Handling

  • Incredibly light and rigid with a kerb weight of 1753kg and torsional stiffness of 28,400N per degree
  • New aluminium front knuckle increases stiffness by 0.13 Deg/kN
  • Front and rear spring rates increased by 28 per cent
  • New 20” Vulcan wheels and Pirelli P-Zero tyres reduce unsprung mass by 4.8kg
  • Rewritten stability control software optimises the system for enthusiastic driving
  • Jaguar High Performance Braking System fitted as standard
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Mike Cross, Chief Engineer, Vehicle Integrity: “This car
encompasses everything a performance Jaguar should be; as capable,
precise and thrilling on a wet Welsh B-road as it is at the Nürburgring.
Every response delay has been minimised in order to give the car a more
connected feel in the manner in which it steers, handles, stops and
goes.”

Jaguar pioneered the use of aluminium construction for series
production cars, exploiting the metal’s low mass and high tensile
strength to maximise benefits in terms of performance, agility, fuel
consumption and emissions.
The platform underpinning the XK range makes the car one of the
lightest and most rigid in its class with a kerb weight of 1753kg and
torsional stiffness of 28,400 Newtons per degree. This fundamental
strength allowed Jaguar’s Vehicle Integrity team, led by Mike Cross, to
develop the dynamic attributes of the XKR-S to the full, without
affecting refinement. Every Jaguar achieves an unrivalled mix of
sporting appeal and luxurious comfort and the XKR-S is the most driver
focused Jaguar ever made.
Taking the solid foundation of the aluminium architecture as a
starting point, both front and rear suspension systems have been
upgraded. The double wishbone front suspension has been comprehensively
revised with a new aluminium steering knuckle that significantly
increases camber and castor stiffness by 0.13 degrees per Kilonewton to
transform the accuracy and weighting of the steering for greater levels
of connection, feedback and precision. The Active Differential Control
has been reprogrammed to reduce steering sensitivity at the very high
speeds of which the car is capable, increasing stability and driver
control.
Rear suspension geometry has been revised with rear wheel steer
optimised for maximum agility while spring rates have been increased at
both ends of the car by 28 per cent. Bespoke software for Jaguar’s
Adaptive Damping has been written for the XKR-S, ensuring both total
body control and maximum traction and grip.
Wheel sizes have been increased with the unique lightweight forged
Vulcan 20-inch alloys now having a width of nine inches at the front and
10.5-inches at the rear for greater precision and grip. The new wheels
wear Pirelli P Zero tyres measuring 255/35 R20 at the front, 295/35 R20
at the rear. This combination has reduced overall unsprung mass by 4.8kg
with a commensurate improvement in handling and dynamism.
The Dynamic Stability Control System has been reworked to maximise
the benefit of these wider tyres. In Trac DSC mode this utilises
specific traction, stability and eDiff settings to alter slip
thresholds, differential torque distribution and intervention levels to
allow the experienced driver to explore the outer edges of the
performance and handling envelope.
The XKR-S is equipped as standard with Jaguar’s High Performance
Braking System. Lighter and more powerful, this features cast iron and
part aluminium monobloc calipers for a combination of power, stability
and feel. The brake discs – measuring 380mm at the front and 376mm at
the rear – are internally ventilated to provide repeated, fade-free
stopping power. In combination with pad surface increases of 44 per cent
front and 31 per cent rear the system provides total security and
confidence on both road and track. Stopping distance from 124mph has
been improved by 2.7 per cent over the already impressive XKR.
The end result is a car that captures the essential duality that is a
characteristic of every great Jaguar; capable of transporting the
driver to the fabled Nürburgring in total comfort and hushed silence,
and yet still able to deliver a sub-eight minute lap time and then
return home with total ease.
Interior
The cabin of any Jaguar is always a uniquely special place in which
to spend time and the XKR-S meets all expectations from the moment the
driver enters to be greeted by the red Start button pulsing like a
heartbeat. When pressed, the engine fires with an rich, deep
reverberation and the Jaguar Drive Selector rises from the centre
console as a point of first contact to begin the process of bonding man
with machine.
The interior of the XKR-S has been subtly refreshed with a host of
new trim materials including ebony soft-feel paint for the switches and
gloss black finish to the centre console. The model will also be
exclusively available with a Dark Linear Aluminium finish as an option
to the wood veneers.
A new leather-wrapped, multi-function steering wheel has also been
added, providing a beautiful, tactile interface between car and driver
as do the bright, Jaguar-embossed, stainless steel pedals.
Exclusive to the XKR-S are the new Performance front seats with an
integrated head restraints and increased lateral and squab support to
hold driver and passenger securely and comfortably in place during the
high speed cornering of which this car is capable. The 16-way adjustment
of squab, cushion, lumbar and bolster elements is supplemented by
memory and heating functions.
The sense of occasion offered when driving the XKR-S will be
heightened by the new carbon leather accents covering the seats,
featuring unique contrast micro-piping and stitching combinations in
Reims Blue, Red and Ivory. Duotone combinations of Charcoal with Tan and
Charcoal with Red are also available.
Technical Specifications

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ENGINE AND TRANSMISSION
Engine Capacity (litres) 5.0
Engine Capacity (cc) 5000
Cylinders 8
Valves per Cylinder 4
Compression Ratio 9.5:1
Bore/Stroke (mm) 92.5/93.0
Bore/Stroke (inches) 3.64/3.66
Final Drive Ratio 3.31:1
Transmission 6-speed automatic
1st 4.17:1
2nd 2.30:1
3rd 1.52:1
4th 1.14:1
5th 0.87:1
6th 0.69:1
Rev 3.40:1
PERFORMANCE
0-60mph (seconds) 4.2
0-100kph (seconds) 4.4
0-100mph (seconds) 8.7
100-180kph (seconds) 7.6
Top Speed (mph/kph) 186/300
Max. Power (BHP@rpm) 542
Max. Power (PS@rpm) 550
Max. Power (KW@rpm) 405
Power to Weight Ratio (BHP/ton) 309
Power to Weight Ratio (PS/tonne) 314
Torque (lb ft@rpm) 502
Torque (Nm@rpm) 680
Torque to Weight Ratio (lb-ft/ton) 286
Torque to Weight Ratio (Nm/tonne) 388
Aerodynamics (Cd) 0.34
ECONOMY
Urban (mpg) 15
Urban (l/100km) 18.9
Extra Urban (mpg) 33
Extra Urban (l/100km) 8.6
Combined (mpg) 23
Combined (l/100km) 12.3
City EPA 15
Highway EPA 22
US C-H Combined (US mpg) 17
Fuel Tank Capacity (litres) 74.0
NEDC Combined CO2 (g/km) 292
DIMENSIONS
Wheelbase (inches) 108.3
Wheelbase (mm) 2752
Front Track (inches) 61.4
Front Track (mm) 1560
Rear Track (inches) 63.3
Rear Track (mm) 1608
Overall Length (inches) 188.7
Overall Length (mm) 4794
Overall Width excl. mirrors (inches) 74.5
Overall Width excl. mirrors (mm) 1892
Overall Height (inches) 52.0
Overall Height (mm) 1312
Turning Radius (metres) 10.9
WEIGHT
EU: Kerb Weight (lbs) 3865
EU: Kerb Weight (kg) 1753
Federal: Lightest Weight (lbs) 3968
Gross Vehicle Weight (kg) 1800

All data based on manufacturer’s own testing and subject to change.

Source: Jaguar