The Jaguar XKR (X100) is the first generation of the XK grand tourer.
The XKR, which was introduced in May 1998, used a supercharged variant of the V8 engine used in the XK8 which is also shared with the XJR albeit with a few air-to-water intercooler modifications and a two piece drive shaft. The supercharger is a 2 L (112 cu in) Eaton unit shared with the Ford F-150 SVT Lightning pickup. The supercharger spins at 1.9 times the engine's speed and has 11.9 pounds of boost pressure. Other visual differences from the XK8 include a small rear spoiler and hood louvres on the bonnet for improved engine airflow along with a meshed front grille.
From 1998 onwards, all models of the XK lineup were fitted with the Servotronic II power steering. From late 1999, an optional R kit became available for the XKR which included a stiffer suspension system and gold coloured wheels. From 2002, a GPS system became available as an option on all XK models which replaced the three gauges on the centre console.
The XK range received a mechanical update in 2002 with the engines in both the XK8 and XKR models being enlarged to 4.2-litres, the front headlamps were also updated by the addition of a clear lens. Further changes included new exterior colours and wheels along with different badging. The models were revised again in spring 2004 and notable changes included new wheel designs, bigger front and rear spoilers and a redesigned grille.
Both the XK8 and XKR are electronically limited to a maximum speed of 250.1 km/h (155.4 mph). The XK8 came standard with 17-inch alloy wheels, while 18-inch (Standard on the XKR), 19-inch, and 20-inch wheels were available for additional cost. The XKR models used Pirelli P Zero tyres measuring 245/45ZR-18 at the front and 255/ 45ZR-18 at the rear. Jaguar's Adaptive Cruise Control, introduced in late 1999, is an optional feature available on both models. Both the two-door coupé and two-door convertible came with an all-leather interior, burl walnut trim, and side airbags. The interior was available in two trims, classic and sport. The sport interior trim was aimed for younger buyers and featured an interior designed by Karen Anderson which involved leather upholstery with cloth seats. The classic trim was a more luxurious option and featured heavy use of leather. Jeremy Clarkson, during a Top Gear test-drive, likened the interior of the original XK8 to sitting inside Blenheim Palace. Although reviewers have criticised the high seating position and the improper gauge layout of the interior.
Like its predecessor, the XJS, the XK models use a 2+2 seating layout for the interior. An optional "Jaguar boot" option involved the removal of the small rear seats in favour of increased luggage space.
Compared to the XJS, the XK models are 25 percent stiffer and have a more responsive powertrain.
Initially, the ZF 5HP24 five-speed automatic transmission was coupled to the conventionally aspirated 4.0-litre model and a Mercedes W5A580 five-speed transmission to the Supercharged version, but in 2002 the new ZF 6HP26 six-speed automatic transmission was fitted in both versions of the 4.2-litre model.
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