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View Full Version : 2006 aluminum XJ

06-15-2005, 11:39 PM
Press release:

KEY FEATURES • New 2.7 litre twin-turbo V6 Diesel introduced to XJ range - the first diesel XJ.

• Latest twin-turbo commonrail diesel engine technology means the 2.7 litre V6 produces 207 hp (152kW) EEC and 435Nm of torque.

• Fitted with a Catalysed Diesel Particulate Filter (CDPF).

• Accelerates from 0-60mph in 7.8 seconds, with a top speed of 141mph (225kph), yet returns 35mpg (combined cycle).

• Electronically controlled active engine mounts on diesel model – an industry first – cancel engine idle vibration by 90 percent and provide class-leading levels of refinement.

2006 Model Year XJ saloons also benefit from a large number of additional changes:

• Subtle revision to the XJ’s exterior appearance thanks to removal of front and rear screen finishers and body side mouldings.

• Even better refinement for all XJ models with the introduction of acoustic laminated glass, a new secondary bulkhead system (double-skined), isolated driver’s airbag and modifications to the bonnet sealing system.

• Bluetooth ® wireless system is available where license permits, allowing drivers to use a compatible mobile phone in a safe, legal and convenient manner.

• Uprated braking system with a bigger disc and calliper assembly (not described further in press release).

• Tyre Pressure Monitoring System (TPMS) to highlight an excessive loss in vehicle tyre pressure.

• Two new alloy wheels are introduced: The 19-inch Sabre Wheel replaces the 19-inch Performance wheel on XJR models. An 18-inch Tucana Wheel replaces the 18-inch Dynamic in UK, Europe, North America and the 18-inch Luxury Wheel in other markets on the XJ6 and XJ8 (dependent on market).

• Two new exterior colours - Winter Gold and Indigo.

Jaguar is the first manufacturer in the premium vehicle sector to introduce acoustic laminated glass. This glass reduces wind noise and engine noise levels by up to 5 decibels above standard laminated glass. Jaguar is also the first manufacturer to feature a bonnet liner with integrated side seals which further improve noise levels in the cabin.

As well as ensuring Jaguar customers own one of the most refined cars in the world, the addition of several new technology features to all models (dependent on market) guarantees they also own one of the safest. All XJs are fitted as standard with 19 and 20-inch wheels and - dependent on market - use Jaguar’s Tyre Pressure Monitoring System (TPMS) which assists the driver by highlighting an excessive loss in vehicle tyre pressure. TPMS measures the pressure in each of the tyres on the vehicle and issues warnings if any of the pressures deviate to a significant level.

An Automatic Speed Limiter (ASL) feature can be used by the driver to select a maximum vehicle speed limit. This is an additional function which is incorporated into the current cruise control system. When the ASL has been set, the throttle will respond to the driver’s demand until the set limit is reached. At this point, provided the throttle position is sustained, the vehicle will maintain the set speed. The ASL system can be cancelled by either switching to cruise control, applying kick-down on the accelerator pedal or by pushing the cancel button. ASL is used separately rather than together with the Adaptive Cruise Control (ACC) system.

Similarly, the driver’s airbag is now isolated from the steering wheel, which significantly reduces the level of vibration transmitted through to the driver.

Aware that safe and legal mobile phone usage is vital to nearly all our customers, Jaguar introduced Bluetooth ® connectivity to the XJ as an optional feature in the 2005 Model Year (where license permits), replacing the previous fixed phone solution.

The system has been developed by Jaguar in conjunction with Motorola and is compatible with a number of current Bluetooth ® handsets (depending on market). The main benefit of the Bluetooth ® integration feature is the flexibility and simplicity it offers, providing primary phone functions while interacting with on-board vehicle controls such as steering wheel buttons, the audio system, touch-screen and JaguarVoice control (where fitted). The phone can be left in the driver's bag or pocket and does not need to be docked into the vehicle.

Calls can be actioned by using the steering wheel controls and audio or touch-screen keypads. The audio will be muted and the dedicated microphone, carried over from previous systems, switched on. Voice commands can be used where the optional JaguarVoice system is fitted.


The combination of a modern turbodiesel engine and the highly advanced aluminium body of the XJ range delivers an exceptional package of performance, dynamics, refinement and economy. All the advantages of modern diesel engines – fuel efficiency, relaxed motoring and impressive power delivery – are only amplified by linking them to a super-strong and lightweight chassis, like that of the XJ.

Launched in Jaguar’s mid-range S-TYPE saloon in 2004, Jaguar’s state-of-the-art twin-turbo V6 Diesel sets new standards in refinement and performance. The highly efficient 24-valve engine features advanced technologies, including the latest generation high-pressure, commonrail, direct-injection fuel system and a lightweight, compacted graphite iron (CGI) cylinder block.

The outstanding strength and durability of CGI means that less material is needed than for a conventional cast iron block, ensuring reduced engine weight and length. In fact, the new diesel engine is the lightest unit of its type, at just 202kg. This significantly contributes to the excellent power-to-weight ratio and fuel economy.

Other features at the heart of the engine provide the capability to deliver high performance and excellent durability. Cast aluminium pistons incorporate ‘double wave-gallery’ cooling. In this process, oil is sprayed precisely onto the inside of the pistons from jets in the block. The oil then flows through two internal wave-shaped channels to help cool each piston crown. This arrangement also has the indirect benefit of reducing piston ‘slap’ noise.

Management of the engine’s noise characteristics has focused particularly on injector tick and combustion noise, which is controlled through the use of next-generation commonrail technology, including ‘multiple-point’ injection and closed-loop injection control, which ensure that the combustion is smooth under all operating conditions.

The fuel quantity provided by each injector is controlled by a Piezo actuator, which enables highly accurate fuel metering of up to five injections per cycle. These features provide an extremely fine spray of diesel fuel, which ensures the most uniform fuel-air mixture possible, resulting in a more complete combustion process. As a result, the diesel engine is able to achieve both high power and the desired emissions capability.

From the outset, the 2.7 twin-turbo Diesel engine was designed to meet future emissions levels. However, further advances in reducing emissions since the launch of the S-TYPE twin-turbo Diesel have been made through changes to the fuel injection system, utilising higher injection pressures and different injector spray patterns. The calibration of the electronically actuated turbochargers, the exhaust gas recirculation system and port deactivation have also been revised. With the addition of a Catalysed Diesel Particulate Filter (CDPF), the advanced design of the V6 engine ensures it exceeds Euro Stage IV emissions requirements.

Aiding both performance and emissions is a forced induction system, comprising twin-turbochargers with state-of-the-art electronic actuation. Traditionally, turbochargers are vacuum actuated, but this new form of rotary electric actuator gives a higher degree of control, providing benefits in the areas of emissions and transient engine performance, as well as in balancing performance and emissions between the two cylinder banks. The turbochargers are a low inertia type for quick, responsive, power delivery.

The high-grade aluminium alloy cylinder heads are equipped with four valves per cylinder and double overhead camshafts. This combination provides optimum induction and exhaust actuation, with attendant benefits in performance and emissions. The cylinder head design includes a port deactivation system and pistons with toroidal combustion chambers, producing a highly efficient combustion capability. A low - by diesel standards - compression ratio of 17.3:1 contributes to improved emissions quality, quieter combustion and compatibility with the engine’s unique forced induction system. In a diesel engine, reduced compression means less heat build-up in the piston bowl and more efficient fuel burn, resulting in lower levels of pollutants.

A revised secondary bulkhead structure has been introduced to the engine compartment of all XJ models – both diesel and petrol – to reduce interior noise levels by up to 5 decibels. The result is the most refined vehicle in its class for interior comfort.

The XJ Diesel is also the quietest vehicle in its class for exterior noise, with the noise level measured by the Vehicle Cerification Agency being 7 decibels (A) lower than the EU legal limit for diesel vehicles. In order to achieve this, the exterior noise package has been significantly enhanced.

The XJ 2.7 litre twin-turbo Diesel is best-in-class for isolation from engine idle vibration. This is achieved with active engine mounts, which are introduced on all 2006MY XJ Diesels and are an industry first. The engine mounts were designed and developed in conjunction with Avon Automotive. Diesel engines generate much greater levels of vibration than their petrol equivalents, which is why the mounts are being fitted to the XJ Diesel variants. Active mounts use an electronic control system and a powered mechanism to cancel an additional 90 percent of this engine vibration at idle.

A system that can cancel out in excess of 90 percent of engine idle vibration into the car has a huge impact on the vibration levels experienced by the vehicle occupants. This technology, in conjunction with the other noise, vibration and harshness (NVH) improvements, ensure that Jaguar delivers class-leading levels of refinement for the XJ's first ever diesel engine.

06-27-2005, 02:05 PM

09-05-2005, 04:32 AM

10-10-2005, 03:05 AM
2006 normally-aspirated XJs get brake rotors that are two-tenths of an inch larger in front and a half-inch larger in back. The calipers are stiffer and stronger for 2006.

2006 supercharged XJs have 40 percent stiffer front calipers.

10-11-2005, 06:51 PM
That's good. Braking is one thing where Jaguar is slightly behind their rivals.

11-19-2005, 03:11 AM
All 2006 XJs have more powerful brakes than 2004-2005 XJs. Supercharged XJs no longer use Brembo brakes, but the calipers are now floating.

<b>2006 normally-aspirated XJs</b>:

Front: 12.83 x 1.18 in. ventilated discs, floating cast iron calipers

Rear: 12.83 x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper

<b>2004-05 normally-aspirated XJs</b>:

Front: Ventilated discs, 12.6 in x 1.18 in., sliding aluminum calipers

Rear: Ventilated discs, 11.3 in. x .79 in., aluminum calipers

<b>2006 supercharged XJs</b>:

Front: 13.98 in. x 1.26 in. ventilated discs, floating composite aluminum and cast iron four calipers

Rear: 12.83 in. x 0.79 in. ventilated discs, floating aluminum calipers with integral park brake caliper

<b>2004-05 supercharged XJs</b>:

Front: Brembo ventilated R Performance discs, 14.4 in. x 1.26 in., fixed aluminum four piston calipers

Rear: Brembo solid R Performance discs, 13.0 in. x .59 in., fixed aluminum four piston calipers

2006 supercharged XJs have 400 hp (new SAE [Society of Automotive Engineers] ratings) and 413 lb-ft of torque.

The addition of an acoustic laminate to the windshield and side glass of the 2006 XJ helps to reduce interior noise, while simultaneously increasing occupant safety by making "smash and grab" theft particularly difficult.

2006 normally-aspirated XJs have 300 hp and get 27 mpg on the highway.

2006 XJ shown below

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