New features for 2012 ensure the Discovery 4 remains crowned the world most capable all-purpose vehicle
- Winner of 36 awards since launch in 2009
- Entry-level audio and navigation systems now compatible with Bluetooth, DAB & USB/iPod
- Premium Harmon Kardon LOGIC 7 now boasts 17 speakers and 825W of power
- Rear Seat Entertainment now available via WhiteFireTM wireless technology
'Say What You See' voice activation system In addition to the driveline improvements, the Discovery 4’s design and equipment levels have been given a makeover too. There are two new alloy wheel designs,three new option packs and improved audio and navigation systems based on the latest MOST Gen 2.1 electrical architecture.
The entry-level audio system has now been upgraded with a colour screen replacing the previous black and white unit and available with Bluetooth, DAB and USB/iPod connectivity. Also for the first time, the audio system is available with a non-navigation touch-screen. The new GEN 2.1 provides enhancements to the Premium Harmon Kardon LOGIC 7 system with an astonishing 825W of power through a 17-speaker system whilst the new ‘Say What You See’ voice command on premium systems allows the driver to use spoken
Outstanding V8 engine continues to power the Discovery 4 range in 2012 The astonishing 5.0 LR-V8 naturally aspirated engine, designed specifically with Land Rover vehicles in mind, remains in the Discovery 4 line-up unchanged for the 2012 model year. The lightweight aluminium alloy engine is both super-efficient and compliant with the stringent US ULEV2 and European EU5 emissions regulations.
The 5.0 LR-V8 produces 276kw and 510Nm torque with low CO2 emissions of 28g/km. One of the secrets of the V8’s efficiency is the centrally-mounted, multihole, spray-guided fuel injection system delivering fuel at a pressure of up to 2175psi (150bar) directly to each cylinder. The injectors are positioned to deliver fuel precisely to the centre of the combustion chamber for maximum air-fuel mixing and accurate combustion control. The charge cooling effects of the direct injection system allow a high compression ratio of 11.5:1 which further improves engine efficiency. During the engine warm-up phase, the combustion system employs multiple injection mode strategies to deliver 50 percent more heat for fast catalyst warm-up and substantially reduced emissions.
A number of clever design features include the industry-first, torque-actuated variable camshaft timing on all four cams. Unlike conventional systems which rely on oil pressure, these are actuated by the positive and negative torques generated by the opening and closing of the valves, reducing energy consumption. Cam profile switching (CPS) selects either a profile suitable for low speed running or another which gives increased lift for high performance. This provides the Discovery 4 with exceptional low-end torque to negotiate demanding terrain and allows it to become fleet of foot when conditions allow.
Torque and power is also optimised by a variable inlet manifold which changes the length of its eight inlet tracts. The manifold switches between a 680mm inlet tract to provide high torque at low revs and a 350mm inlet path allowing maximum power at high revs. The precise position is optimised throughout the rev range at all times.
The engine also features a unique reverse flow cooling system where coolant passes through the cylinder heads before the block. This allows the heads to remain cooler and the knock threshold is pushed further back for greater efficiency.
An oil to water heat exchanger also transfers heat from the coolant to the engine oil. These features promote faster engine warm-up for reduced emissions and enables the cabin to warm-up faster too. Frictional losses have been reduced by the use of diamond-Like Carbon Coating (DLC) on some components, an intelligent oil pump pressure relief valve (PRV) to optimise oil pressure and the use of lower viscosity 5W-20 oil further reduces parasitic losses without compromising durability.
"The LR-V8 engine continues to justify its position as one of the finest engines in its class having set new standards for efficiency, power and torque that remain hard to beat. The combination of advanced technology and light weight make it the ideal power unit, complementing the Discovery 4's off-road and onroad capability," said Murray Dietsch, Director of Land Rover Programmes.
Superb 6-speed automatic transmission
The LR-V8 drives through the ultra-refined ZF HP28 6-speed automatic transmission.
Its characteristics have been optimized by Land Rover engineers to provide the same class-leading response, with rapid and refined shifts. The superior power and torque characteristics of the engine make it possible to actuate the transmission’s lock-up clutches much earlier in each gear, reducing slip through the hydraulic torque converter, optimizing both fuel consumption and CO2 emissions.
Advanced chassis, suspension and brakes
The Discovery 4 suspension system was substantially revised for 2010 model year with changes to roll centres, anti roll bars, suspension knuckles, damper bushes and the addition of a variable ratio steering rack for greater stability during high speed cruising and increased sensitivity at acute steering angles. More powerful brakes comprised twin-piston sliding callipers with 360mm ventilated discs at the front and single piston with 350mm ventilated discs at the rear. The understeer control system, which intervenes by automatically slowing the vehicle to bring it back under driver control, was also revised. These features remain unchanged in 2012 for all versions of the Discovery 4.
Off-road ability remains top of the class for 2012
When it comes to off-road ability, Land Rover vehicles are acknowledged as setting the standards for others to follow with its acclaimed Terrain ResponseTM system. For 2011, two additional functions were added, Hill Start Assist and Gradient Acceleration Control.
Hill Start Assist retains the initial driver-generated brake pressure long enough for the foot to move from brake pedal to throttle without the car rolling backwards. The brake is released after a sufficient time has elapsed or when the engine is supplying enough torque to move the car up the hill. Hill Start Assist is always available, not selectable, and neither is its operation indicated to the driver.
Gradient Acceleration Control is designed to provide safety cover on severe gradients when the driver does not have Hill Descent Control engaged. By pressurising the brake system, Gradient Acceleration Control slows the car to a limit determined by the throttle position when the car is descending the slope in the driver’s intended direction of travel. This includes descending the slope forwards in drive, or rearwards in reverse.
Otherwise (such as descending while facing up the
gradient with Drive selected) Gradient Acceleration Control restricts speed to 5km/h for up to 20 seconds, allowing the driver to regain proper control. "These advanced all-terrain functions have proven themselves to be world class since their introduction last year. Both are subtle but effective additions which deliver an added layer of safety to drives who want to venture further afield," said Nick Veale, Vehicle Engineering Manager.
Detail and design improvements for 2012
For 2012, crisp new steering column stalks with chrome bezels provide clearer symbols and a new premium pebble-like design to the smart key makes it both more attractive and easier to carry. Externally a new 19” alloy wheel comes as standard on the HSE whilst a Gloss Black 20” 5 split-spoke wheel design and extended Satin Black roof rails are available as customer options across the range.
The Timed Climate feature which pre-heats the cabin and engine in cold weather, has been upgraded from a one-day timer to a seven-day timer operated much like a home central heating programmer. Programming is accomplished via the audio system touch screen or remote control. Where touch screen audio systems are not fitted the feature is controlled with the remote control only.
Audio, Navigation and Rear Seat Entertainment move up to another level Discovery 4 audio systems have been rationalised and improved for 2012 and the electrical architecture upgraded to the latest MOST Gen 2.1. A new, entry level 8-speaker system with colour display replaces the previous system with black and white display. The entry level system also has options for Bluetooth, DAB and USB/iPod connectivity. The Hi-ICE Harman Kardon System has been upgraded from 9-speakers to 11-speakers and the output boosted from 240W to a substantial 380W.
The Premium Harman Kardon LOGIC 7 system has seen the most dramatic improvement, from 14 to 17 speakers and an almost unbelievable increase in output power from 480W to a staggering 825W.
The higher end touch-screen audio systems were previously available only in conjunction with a navigation system but are now available independently.
Navigation is available in two levels - Base and Premium, with the latter enhanced with voice activation. Touch screens have been revised with a new, contemporary style and a ‘Virtual CD Autochanger’ on models equipped with hard-disc navigation allows storage of up to 10 albums in uncompressed format on the same hard drive. ‘Say What You See’ voice activation gets over the problem of memorising commands and prompts the driver by displaying commands in a step-by-step format on the screen. Voice commands can be run together as shortcuts and the system is activated by the Push-to-Talk (PTT) button on the steering wheel.
Rear Seat Entertainment (RSE) is now equipped with a single slot DVD drive in the audio head unit so the disc can be conveniently loaded from inside the cabin. This new system replaces the previous six DVD Changer accessed through the luggage compartment. The rear seat audio system is operated by new powerful wireless technology called WhiteFireTM via cordless headphones, and can also be controlled by remote control. The system supports connectivity with games consoles and video playback of MP4 files stored on USB.
The phonebook capacity for the Discovery 4 has increased significantly for 2012 from 700 entries to several thousand, whilst the TFT Message Centre interface has been redesigned to display audio, phone and navigational information.
TERRAIN TECHNOLOGIES boost economy and lower CO2 emissions The new Discovery 4 is packed with features aimed at reducing fuel consumption and reducing CO2 emissions.
The parallel sequential turbocharging system of the 3.0-litre diesel makes use of its larger, primary turbo most of the time. The smaller secondary turbo remains dormant when higher power is not required, reducing pumping losses and consequently, fuel consumption. The highly efficient, third generation common rail injection system with piezo injectors and fuel metering, also makes a substantial contribution to fuel economy.
The LR-V8’s high pressure, spray guided direct injection system optimises combustion while the variable camshaft timing system, camshaft profile switching and variable inlet manifold all join forces to ensure the engine is optimised for fuel efficiency throughout the range. Thanks to the advanced cooling system, faster warm-up also improves fuel economy as do the low friction design features.
Engines have also been optimised for low-end torque as well as economy, making it possible to activate the lock-up clutch of the automatic transmissions at lower speed.
This reduces ‘slip’ in the hydraulic torque converter improving both fuel consumption and CO2 emissions. The higher torque at lower rpm also enables longer gearing for more economical cruising.
The Discovery incorporates several other energy saving features too. At standstill, the idle speed of the LR-V8, 700rpm, using the minimum of fuel without compromising refinement. An Intelligent Power Management System includes Smart Regenerative Charging, so whenever possible the alternator charges the battery when it is most economical to do so, such as when the car is coasting rather than accelerating.
Aerodynamic features at the front end such as the lower chin spoiler and front wheel deflectors help to reduce drag by increasing underfloor airflow. The air conditioning pump is driven through a clutch which disengages when the air conditioning is not in use, reducing parasitic losses and delivering improvements in fuel consumption and CO2 emissions.
e_TERRAIN TECHNOLOGIES in summary:
- Cutting edge LR-V8 engine technology
- New ZF 8HP70 6-speed automatic improves efficiency and reduces CO2 Engine calibration optimised
- Low engine idle speeds
- Reduced torque-converter slip
- Higher torque, allowing longer gearing
- Intelligent Power System Management (IPSM) including smart regenerative charging
- Clutched air conditioning pump to reduce parasitic losses
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