2011 Jaguar XKR Special Edition Dual Independent Variable Cam Timing (DIVCT) 5.0 L Supercharged AJ-V8 Gen III R Engine With Very High Efficiency Spray Guided Direct Injection (SGDI)

Jaguar unveils the ultimate XKR Special Edition
Jaguar will unveil the latest dramatic evolution of its supercharged XKR coupe at the Geneva Motor Show. The stunning new XKR Special Edition delivers a significantly raised maximum speed – 174mph (280km/h) – and bold exterior styling changes that create the ultimate supercharged Jaguar.
The XKR Special Edition combines a number of new features and option packs that are introduced to the XK range at 2011 Model Year.

aguar customers have the option to personalise their vehicle by building on the existing XKR package to deliver a car that offers even greater performance without sacrificing the refinement and luxury for which every Jaguar is renowned.

Introduced last year, the XKR boasts a state-of-the-art 5.0-litre supercharged AJ-V8 Gen III R engine that delivers 510PS (510bhp SAE), 625Nm of torque and propels the coupe to 60mph in just 4.6 seconds. Now, in Special Edition guise, the XKR’s top speed climbs significantly from an electronically limited 155mph (250km/h) to 174mph (280km/h) thanks to the addition of the Speed Pack. Allied to that remarkable engine is an advanced six-speed automatic transmission with steering-wheel mounted paddles, lightweight aluminium body structure and a range of computer-controlled systems including Active Differential Control and Adaptive Dynamics that ensure the supercharged car accelerates even faster, handles even more precisely and sets new standards of ride and comfort.

The benefits of the XKR’s lightweight but stiff and strong advanced all aluminium body are already acknowledged. Not only does this architecture bring dynamic benefits thanks to its torsional rigidity, it also offers excellent safety and crash repair features and provides the ideal base to improve performance across the board – including optimised fuel economy and CO2 emissions. Thanks to the combination of excellent powertrain efficiency and the XKR’s advanced lightweight body architecture, its fuel economy is comparable to the previous generation of XKR – despite the significant increases in power and performance.

The XKR Special Edition pairs the optional Speed and Black Packs to create the bold new model unveiled in Geneva, which also sports optional Piano Black veneers on the dashboard and red brake callipers. Both option packs are also available separately for customers who seek to personalise their cars in terms of either styling or additional performance. Whatever combination is chosen, every XKR delivers that classic Jaguar blend of seductive, powerful and elegant looks, beautifully finished interiors and even more comprehensive specification.

The driver is the centre of attention in the XKR Special Edition, with exciting new features including the acclaimed JaguarDrive Selector™, and high levels of specification such as the 7-inch Touch-Screen, 16-way heated and cooled memory seats, Jet Suedecloth premium headlining and Flint Grey premium carpet. In addition, a bespoke new Jaguar XK suitcase (which will be available as an option for all XK models) has been fashioned for the XKR Special Edition. From 2010, the Jaguar XK range (UK and certain European markets only) will be fitted with the tyre repair Instant Mobility System. By adopting IMS on all models, the XK frees up its 30-litre wheel well, which is now carpeted and can hold the specially designed and tailored XK accessory suitcase, substantially increasing the versatility of the car.

THE NEW 2011 XKR OPTION PACKS

The new 2011 Jaguar XKR Special Edition consists of two new styling and performance packs – the Speed and Black Pack. Both are available to XKR coupe customers separately and provide new levels of styling and performance for owners looking to further personalise their Jaguar.

The XKR Speed Pack

The XKR with new optional Speed Pack allows customers to further strengthen their XKR’s already impressive breadth of capability, by extending the car’s top speed from 155mph (250km/h) to an electronically limited 174mph (280km/h), thanks to a unique engine and transmission recalibration.

To ensure the XKR with Speed Pack remains stable at high speeds, the coupe uses a revised front aerodynamic splitter and larger rear spoiler to provide increased balance and a reduction in lift. The XKR’s computerised Active Differential Control also adjusts to reduce steering sensitivity at very high speeds, further improving stability and driver control.

Customers who order the XKR coupe with the Speed Pack will be offered a paint palette that is part of the Jaguar Designers’ Choice programme – a range of colours that have been specifically chosen to compliment the performance potential of the car. Seven colours are available on Speed Pack models – Ultimate Black, Polaris White, Salsa Red, Liquid Silver, Lunar Grey, Kyanite Blue and Spectrum Blue.

Every XKR with the Speed Pack will come with body-coloured side sills and rear diffuser, and a chrome finish to the window surrounds, upper and lower mesh grilles, side Power Vents and boot lid finisher. Red brake callipers with a Jaguar ‘R’ logo sit inside 20-inch Kasuga alloy wheels.

By raising the XKR’s maximum speed the new car has extended its sporting credentials, taking it even further into supercar performance territory. Russ Varney, Chief Programme Engineer, XK Series, explains the philosophy behind the uprated XKR:
“With 510PS and 625Nm of torque, the XKR has immense reserves of power and acceleration which impress everyone who experience it. The car has always had the potential to reach speeds far beyond its original electronically limited maximum and many of our customers have expressed an interest in a car that can safely be driven faster where conditions permit. The new Speed Pack allows them to release some of that potential and give them control of the fastest Jaguar XK we’ve made to date.”

The performance potential of the supercharged AJ-V8 Gen III R engine comes courtesy of its highly advanced design. The all-aluminium four-cam power unit has a number of features that deliver power with very high efficiency, including spray-guided direct injection (SGDI), which improves performance and economy, and dual independent variable cam timing (DIVCT), which benefits performance and economy, while also reducing emissions.

The AJ-V8 engine is built around a stiff, aluminium block with cast-in iron liners and cross-bolted main bearing caps to reduce noise, vibration and harshness. The block is high pressure die-cast, providing a superior finish and greater dimensional accuracy. The engine uses aluminium heads, with four valves per cylinder and spheroidal-graphite cast-iron crankshafts and forged steel connecting rods. The cylinder heads for the first time are specified with a secondary (recycled) aluminium alloy thus reducing the environmental impact of manufacturing the new engine.

A sixth-generation, twin vortex system supercharger is fitted to the XKR’s 510PS engine. It is a compact Roots-type unit, feeding air through twin intercoolers, which in turn are water-cooled by their own discreet cooling circuit. The high helix rotor design improves the supercharger thermodynamic efficiency by more than 20 percent over its predecessor. It also improves noise quality to the point where the unit is virtually inaudible (making supercharger whine a thing of the past). The intercoolers reduce the temperature of the pressurised intake-air and so optimise power and efficiency. Mechanically, the new supercharger and its intercoolers are efficiently packaged in the ‘V‘ of the engine to deliver a lower overall engine height in support of pedestrian safety requirements.

An industry-first, centrally-mounted, six-hole, spray-guided fuel injection system delivers fuel at a pressure of up to 150bar directly to the cylinder. This substantially contributes to improved low-speed, dynamic response. The positioning of the injectors ensures fuel is precisely delivered to the centre of the combustion chamber, maximising air-fuel mixing and improving combustion control. Fuel is delivered through twin, high-pressure fuel pumps that are driven via an auxiliary shaft in the all-new engine block.

The charge cooling effects of the direct-injection fuel system have allowed the compression ratio of the supercharged engine to increase from 9.1:1 to 9.5:1, further optimising fuel economy. During the engine warm-up phase, the combustion system employs multiple injection mode strategies to deliver 50 percent more heat for fast catalyst warm-up and emissions reduction.

A new type of variable camshaft timing (VCT) system introduces another new technology. The four VCT units are activated by the positive and negative torques generated by opening and closing the intake and exhaust valves, instead of by oil pressure. This has allowed the engine oil pump to be reduced in size, saving energy and improving fuel consumption.

VCT units work independently on all four camshafts with 62 degrees of authority on the inlet cams and 50 degrees of authority on the exhaust cams. Timing is optimised by the engine control unit for torque, power and economy at every point in the engine’s speed range. The new VCT units are capable of a response rate up to three times faster than in previous Jaguar engines, with actuation rates in excess of 150 degrees per second. This delivers a more immediate engine response to the driver’s demand for power.

Minimising internal friction is key to improving fuel consumption and CO2 emissions, and as such was a key aim when it came to the design of the engines. As a result, the new Jaguar AJ-V8 Gen III engines achieve another best in class, setting a new industry benchmark for cranktrain efficiency.

All engine bearings were engineered for reduced friction without compromising reliability. Diamond-Like Carbon Coating (DLC) has been used to reduce friction on the fuel pump tappets and a solid film lubricant has been used to coat the piston skirts. New engine oil has a lower viscosity, contributing to an extension in service intervals from 10,000 miles to 15,000 miles (or 12 months). The V8 engine is fitted with an electronic oil-level indicator for added peace of mind.

Sound quality is a key characteristic of all Jaguars and is one particular aspect that customers relish. With that in mind, Jaguar engineers have accentuated the acoustic feedback into the cabin in order to further enhance the driving pleasure.

In addition to the fully active exhaust system in which valves open to provide a more rewarding note, the new XKR has been engineered to provide an intake feedback system to enhance the V8 sound character commonly absent on supercharged engines. Intake manifold pressure pulsations are fed into an acoustic filter at the rear of the engine that is tuned to provide an edgy sports car ‘crescendo’ at high revs. The filter is controlled by the engine management system, which only allows the sound to enter the cabin under the appropriate driving conditions.

The new intake feedback system combined with the fully active exhaust system provides the most exhilarating aural experience yet delivered on a Jaguar.