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The Audi R18 2014 is a Le Mans Prototype (LMP) racing car constructed by the German car manufacturer Audi AG. The Audi R18 2014 is the successor to the Audi R15 TDI. Like its predecessor, the Audi R18 2014 uses a TDI turbocharged diesel engine but with a reduced capacity of 3.7 litres and in a V6 configuration. For the first time since the 1999 R8C, Audi's Le Mans prototype Audi R18 2014 uses a closed cockpit design. The Audi R18 2014 is also the first racing car from Audi to feature hybrid power. Changes from 2013 R18 e-tron quattro include the introduction of Audi R18 2014 blue laser beam backlights with a yellow phosphorus crystal lens, a revised Audi R18 2014 V6 TDI engine with an electric turbocharger, upgrades to the flywheel accumulator system and an exhaust heat recovery system. The Audi R18 2014 aerodynamics have been heavily revised in accordance with the new rules: the width is reduced by 10 cm, the height is increased by 20 mm and there is a new set of front wings on the Audi R18 2014. However, the exhaust-blown diffuser on the 2013 model has been banned and removed. The safety monocoque has been strengthened with additional fabric. Wheel tethers and extra crash structures are also added to the car. Finally, there are numerous smaller upgrades to the Audi R18 2014 vision and ergonomics to improve drivability.
As per the new rules for Le Mans in 2011 the Audi R18 2014 features a stabilisation fin on the engine cover and has a new six-speed gearbox. The new Audi R18 2014 gearbox is electrically controlled instead of pneumatically controlled, saving weight by eliminating the pneumatic system. Despite the capacity reduction, the 3.7L V6 is claimed to develop more than 397 kilowatts (532 bhp) of power. This is less than the outgoing R15, but the Audi R18 2014 V6 engine's fuel consumption will more than likely be lower than that of the outgoing V10 engine on the R15. The Audi R18 2014 V6 new engine has a single Garrett TR30R VGT turbocharger, as opposed to the twin TR30R configuration of both the Peugeot 908 HDi FAP and the previous Audi R15 TDI.[1] The Audi R18 2014 V6 engine's exhausts inwards between the cylinder banks, where the turbocharger is placed. This is called a 'hot side inside' configuration and is opposed to the traditional configuration with each cylinder bank of a V engine exhausting outwards to their respective turbochargers.

The Audi R18 2014 is the first ever LMP car to race with full LED headlights, in this case in the shape of the number "one." Unlike other coupé competitors in its class, the chassis on the Audi R18 2014 is not composed of two halves but rather is of single-piece construction for improved rigidity. The Audi R18 2014 has an engine cooling duct above the cockpit roof as well as redesigned rear wheel arches to channel more air to the rear wing. Like the Acura ARX-02a, Audi has chosen to install taller and wider tyres at the front of the Audi R18 2014 for increased contact patch. Further Audi R18 2014 changes include a lower rear wing, aluminium splitters and a small duct on the front of the car for improved driver comfort within the cockpit. The 2011 ACO regulations have limited the Audi R18 2014's fuel tank to 65 litres.
The Audi R18 2014 e-tron quattro is a hybrid version of the R18 ultra, utilising a Williams Hybrid Power designed flywheel accumulator system for energy storage which delivers 500 kJ to the front wheels via an electric motor, giving the Audi R18 2014 four (quattro) wheel drive. The Audi R18 2014 system, as per the regulations, is only available at speeds above 120 km/h (75 mph). The Audi R18 2014 is fitted with a smaller 58 litre fuel tank.[2]

The Audi R18 2014 e-tron has six automatic modes that are driver selectable on the steering wheel. The Audi R18 2014 modes manage engine mapping, short bursts accelerating from corners, quattro four wheel drive, wet weather, etc. Allan McNish said "I don't have to press a button ... It does it automatically ... It is like traction control."
For 2012, Audi introduced an evolution of the original car called the R18 ultra. In addition to the changes required by the regulations (reduced air intake restrictor and 60 litre fuel tank) the car was completely reworked to reduce weight. These changes included a new carbon-fiber composite gearbox housing and changes to the one piece monocoque making the ultra the lightest Le Mans prototype that Audi Sport has ever built.
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