Discovery is always in its element, whether it’s crossing town or taking everyone beyond the city limits for a weekend of adventure. Discovery’s stadium seating gives everybody unspoiled views. And a range of infotainment and technologies keep everyone entertained, relaxed and comfortable.
The Discovery 4 (called the LR4 in North America) is an updated version of the Discovery 3. Using the same Integrated Body Frame structure, the new Discovery has altered front and rear light units and a restyled front grille and bumper to adopt the same smoother, rounder style as also adapted for the 2010 Range Rover and Range Rover Sport. The Discovery 4 also retains the body-coloured wheel arches and bumpers as the late Discovery 3s (early D3s had black plastic trim). Optional Daylight Running Lamps can be specified whilst LED lights feature prominently in both front and rear lamp units.
The majority of the changes are mechanical, with reliability issues addressed, improvements to engines and gearboxes, brake and suspension refinements, but also included major interior upgrades with a more luxurious and contemporary interior with greater luxury and technology levels available. The D4 receives two engines from Jaguar Land Rover's Gen III range. The TDV6 Gen III is a 3.0-litre development of the 2.7-litre engine used in the D3. The new version features advanced twin-sequential turbochargers where a Variable geometry turbocharger is used at low engine speeds, with a second standard turbo is brought online at higher engine speeds.
An improved version of the ZF six-speed automatic/sequential gearbox was incorporated and in 2012 was further improved including a change to 8 speeds. It includes taller gearing to take advantage of the new engines' greater torque output and an updated lock-up system to further reduce fuel consumption. Other technical changes include the fitting of the more powerful brakes from the Range Rover Sport and thicker anti-roll bars to improve on-road handling.
TEXT FROM THE WIKIPEDIA LAND ROVER DISCOVERY PAGE