The impressive upgrade sees the 3.0-litre SDV6 engine tweaked to deliver 256hp, 11hp more than the previous generation version.
Despite the extra power, CO2 emissions have also dropped from 244g/km to 230g/km because of the introduction of a number of new greener technology.
This includes a new, more efficient eight-speed automatic transmission for the Discovery 4, improvements to the efficiency of the engine cooling systems.
The diesel engine will also boast a diesel particulate filter for the first time, technology designed to reduce the amount of particulates – or soot – from the engine.
“Improved performance, lower CO2 emissions and enhanced design and equipment levels, consolidate the Discovery 4’s position as the most capable and versatile all-purpose vehicle on and off the road today. The Discovery 4 is quite simply in a class of its own,” said Colin Green, Land Rover UK Managing Director.
The Land Rover Discovery 4 will be available with the new engine from October priced from £37,995 and the British-based car maker has revealed some styling upgrades to sit alongside the improvement in performance.
These include two new alloy wheel options, improvements to the sound and satellite navigation and, in higher spec models, a new voice activation system.
Entry-level models will now include a new colour screen to replace the current black and white unit, while Bluetooth, a DAB radio and iPod connectivity is added to standard specification levels.
In higher-spec versions a new 17-speaker sound system and two new option packs have been included in the options list, including rear seat entertainment.
The Land Rover Discovery 4 is a 4×4 SUV featuring Land Rover’s famed All-Terrain system and a luxurious interior in keeping with the brand’s premium aims.