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. Two versions of the 3.0-litre diesel are offered. Fuel economy was improved over the previous generation diesel while power, torque and diesel NVH were improved significantly. This system provides greater output than the older engine, with and whilst reducing emissions by 10 percent when first introduced and in 2014 increased to . The Gen III version of the V8 petrol engine (available in markets outside the UK such as North America, Russia, Japan, Australia, and some EU countries) is now a 5-litre unit with Direct Petrol Injection developing and . An improved version of the ZF six-speed automatic/sequential gearbox was incorporated and in 2012 (2014 in the US) 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. The Stability Control System now includes a programme that detects the onset of understeer and applies the brakes. The Discovery 4 retains its predecessor's fully independent air suspension with cross-linking when off-road and the twin-range transfer gearbox with an electronic infinitely variable locking centre differential. As before, a similar locking rear differential is available. The Terrain Response system remains but with two new features – the 'Sand' mode incorporates a new traction control mode to prevent loss of traction when starting off and stopping in soft sand, and the 'Rock Crawl' mode gains a feature that applies gentle brake pressure at low (less than walking pace) speeds to improve grip and stability on slick rock. The system is also 'retuned' to account for the new engines and gearboxes with their different torque characteristics. Other new electronic systems include Trailer Stability Assist which can adjust the throttle and brakes to prevent a dangerously swaying trailer. The 2.7-litre TDV6 engine was available in Europe on the basic 2.7 GS passenger and 2010 Commercial ranges. Unlike the Discovery 3 base model, this was equipped with air suspension and the Terrain