Jaguar XJ (X351)

Design

The XJ was designed at Jaguar Land Rover's Whitley plant in Coventry by a team led by design director Ian Callum.[17] Design work began in 2005, with final design approval taking place in November 2006 and the design being frozen in the first half of 2008.[18][19] The new design is a complete departure from any earlier XJ model; mechanically, the car is a development of its predecessor.[20]

Models

In addition to the standard version with a 3035 mm wheelbase, a long-wheelbase version was available with a 3160 mm wheelbase.[10] At the 2010 Moscow Motor Show, a high security version of the car called the XJ Sentinel was introduced.[21][22] This is an armoured version of Long Wheelbase XJ with B7-level ballistic protection as well as providing protection against 15 kg TNT or equivalent explosive. It has the 5.0 L supercharged V8 engine shared with the XJ Supersport having a power output of 510 PS and 19-inch wheels with Dunlop Self Supporting Technology run-flat tyres.[23] Unlike other full-size flagship executive cars, the long-wheelbase variant was designed first and was expected to make up 67 percent of sales in the US market.[24]

Engines

The engine used by the X351 are enlarged and upgraded versions of the previously used V8 petrol and V6 diesel engines.

Transmission and top speed

All 2010 models of the Jaguar XJ include standard six-speed automatic transmission with Jaguar Sequential Shift carried over from the X350, the main change being steering wheel shift paddles rather than the J-gate gear selector. The XJ has an electronically limited top speed of 250 km/h; the limiter has been raised to 280 km/h for the XJR model.[26][27] An eight speed automatic transmission was introduced from 2013 onwards.[28]

Chassis

The XJ features a lightweight aluminium floorpan and body (with 50% recycled material content) based on the X350 chassis and retaining a proportion of the earlier floor pan. The biggest change is reversion to steel coil springs for the front suspension, retaining air suspension for the rear only. Continuously variable damping is electronically controlled as before but with driver selectable modes.[29] The aluminium alloy uni-body makes the XJ L among the lightest of the full-size executive saloons despite its exterior proportions, weighing in at 4131 lb, which is 245 lb lighter than the mid-size/executive BMW 550i.[24]

Equipment

Driver information and entertainment is provided by a Bowers & Wilkins 1,200-watt, 20-speaker Dolby 7.1 surround-sound system,[12] along with a bi-directional touch screen display on which the driver can only see the vehicle functions and satellite navigation data; a front passenger can simultaneously view a DVD movie or a television transmission.[29] Standard equipment levels on the United States-spec XJ L with the base engine includes a panoramic dual-pane moonroof, lane-departure warning, navigation, quad-zone climate control, and power sunshades, which is considered to be generous at this price point compared to other flagship executive saloons.[24]

Fuel economy and emissions

The diesel engine version had a fuel economy of better than 40 mpgimp and a emission rating of 184 g/km.[6]

Special uses

The car has been used by British prime ministers. Dating back to the Jaguar XJ (Series III), various versions of the XJ were used by Margaret Thatcher, John Major, Tony Blair, and Gordon Brown.[30] On 11 May 2010, David Cameron took delivery of the dark grey car No. 10 Jaguar XJ Sentinel as his prime ministerial car.[31] In 2011, Cameron took the delivery of another XJ Sentinel featuring bomb proof doors, bullet proof glass, and armoured plating beneath the floor of the car, respectively replacing the previous XJ Sentinel.[32] The car was used for transporting Theresa May,[33][34] and was also used by Boris Johnson.[35] Under Johnson, the XJ was replaced for the first time since 1979 by the Range Rover Abio Sentinel as the prime ministerial car in 2019.

2011

New options include:[36]

• New Rear Seat Comfort package, which incorporates electric recline, lumbar adjustment and massage functions to reinforce the ultimate executive limousine experience.
• Executive Pack option is added to XJL Portfolio model, which includes provision of fold-down laptop trays and an electric rear sunblind, upgraded carpeting, combination wood and leather steering wheel, gloss wood veneer choices and chrome mirror housings.
• Sport and Speed Pack option, which includes a new front splitter and rear spoiler, suede headliner, sport seats with contrasting stitching, bright metal pedals, either piano black or carbon-fiber interior trim, gloss black exterior trim, red brake calipers, and Venom 20-inch wheel design. The speed governor is relaxed from 250 kph to 280 kph.
• Illumination Package (standard on Supersport model) is available as option of other XJ models.
• 3.0-litre petrol V6 engine for selected markets, launched in China.

XJ 5.0 V8 Portfolio Prestige

The XJ V8 Portfolio Prestige is a special model developed for the Hong Kong market. Based on the XJ L Portfolio with a 5.0-litre V8 engine, it includes the XJ rear seat comfort pack and gloss oak interior veneer as standard equipment.[37]

XJ Ultimate

The XJ Ultimate is a special model introduced in 2011. Available only in the long wheelbase configuration, the car was developed by the Jaguar Land Rover's specialist Engineered To Order (ETO) division and was unveiled at the 2012 Beijing Auto Show. Mechanical equipment for the US model includes a 5.0 L supercharged V8 engine rated at 510 PS and an eight-speed automatic transmission. The XJ went on sale in late 2012 as the 2013 model year vehicle.[38] In India, the XJ Ultimate is available with a 5.0-litre V8 petrol engine that costs inr 18800000 or with a 3.0-litre V6 turbocharged diesel engine that costs inr 17800000.[39]

2012

Changes include:[40][41]

• Introduction of a 3.0-litre supercharged V6 engine
• Eight-speed automatic transmission for all models.
• Jaguar's Intelligent Stop/Start system extended to all V6 and V8 petrol and all diesel engines.
• The supercharged V8 petrol engine has fuel economy gains of up to 11% with emissions reductions of more than 8%, while the naturally aspirated V8 sees economy improvements of up to 8% with emissions down by more than 6%.
• Optional sound systems developed by British ultra-premium specialist Meridian. Available in two power outputs — 380 W and 825 W — both featuring multiple channel amplifiers and digital signal processing software powering an array of loudspeakers.
• Infotainment system updates enhance the audio and navigation interfaces and usability.
• Suspension enhancements to the XJ further optimise passenger comfort.

XJR (2013–2019)

Introduced in 2013, the XJR is a high-performance variant of the XJ. Available in standard and long wheelbase configurations, it includes a 5.0-litre supercharged V8 engine rated at 550 PS and 680 Nm, an increased top speed to 280 kph, eight-speed automatic transmission with a bespoke tuning for the XJR, a new front splitter and aerodynamic sill section combined with an additional rear spoiler and unique R bonnet louvres, Electronic Active Differential and Dynamic Stability Control systems calibrated to enhance handling characteristics, new 20-inch Farallon forged alloy wheels with bespoke Pirelli low-profile tyres, semi-aniline leather, a choice of veneers, and contrasting stitching on the seats.[42]

The XJR was initially unveiled at 2013 New York Auto Show, followed by the 2013 Goodwood Festival of Speed.[43] The US model went on sale as 2014 model year vehicle.[44]

Transmissions

All models include ZF 8HP eight-speed automatic transmission.[45]

2014

Changes include optional Intelligent All-Wheel Drive System for 3.0-litre V6 petrol engine models, addition of long-wheelbase models, power output of the XJR model increased to 550 PS, Intelligent Stop/Start system for all engines and increased headroom for long-wheelbase models (except US model).[46]

2016

The XJ received a facelift for MY2016. Changes include LED front and rear lights, rear J-Blade lights, a new grille, and a new InControl Touch Pro infotainment system, new driver assistance technology and a new audio system.[47]

2017–2019

Models 2017-2019 received an upgraded 10" infotainment LCD, up from 7" LCD that was offered on all previous models.