Audi R18 Wikipedia the free encyclopedia

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Audi e-tron

Audi R18


R18 TDI [ edit ]

As per the new rules for Le Mans in 2011 the car features a stabilisation fin on the engine cover and has a new six-speed gearbox. The new 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 V6 engine’s fuel consumption will more than likely be lower than that of the outgoing V10 engine on the R15.

The new engine has a single Garrett (Honeywell Turbo Technologies ) TR30R VGT turbocharger, as opposed to the twin TR30R configuration of both the Peugeot 908 HDi FAP and the previous Audi R15 TDI. [ 1 ] [ 2 ] The R18’s V6 engine 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 is the first ever LMP car to race with full LED headlights, [ citation needed ] in this case in the shape of the number one. Unlike other coupé competitors in its class, the chassis on the R18 is not composed of two halves but rather is of single-piece construction for improved rigidity. [ citation needed ] The R18 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 for increased contact patch.

Further 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 R18’s fuel tank to 65 litres. [ citation needed ]

R18 ultra [ edit ]

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 Xtrac sequential electrically activated 6-speed racing gearbox with gearbox housing made of new carbon-fiber composite with titanium inserts, carbon clutch, changes to the carbon-fiber composite aluminum honeycomb monocoque built by Dallara, [ 3 ] [ 4 ] Single Garrett (Honeywell Turbo Technologies ) turbocharger with boost pressure limited to 2.8 bar absolute, [ 5 ] Bosch MS24 engine management, 1 x 45.8 mm diameter air restrictor, O.Z. magnesium forged wheels, Michelin Radial 360/710R18 front and 370/710R18 rear tires. [ 6 ]

Audi e-tron

R18 e-tron quattro [ edit ]

Audi R18 e-tron quattro (Overall LMP1 class winner, Le Mans 24 Hours 2012 ).

The R18 e-tron quattro is a hybrid version of the R18 ultra, with a max 500 kJ flywheel accumulator system designed by Williams Hybrid Power. 2 101 PS (74 kW; 100 hp) Bosch Motor Generator Unit driving front wheels with water cooled with integrated power electronics, giving the car four (quattro) wheel drive, a smaller 58-litre fuel tank. The quattro system, as per the regulations, is only available at speeds above 120 km/h (75 mph). [ 3 ] [ 6 ]

2014 evolution [ edit ]

Changes from 2013 R18 e-tron quattro include the introduction of blue laser beam backlights with a yellow phosphorus crystal lens, a revised V6 TDI engine with an electric turbocharger, upgrades to the flywheel accumulator system and an exhaust heat recovery system. The system captures the thermal energy from the exhaust and can add power to either the turbocharger or the flywheel accumulator system. The 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. 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 vision and ergonomics to improve drivability. [ 8 ] [ 9 ] [ 10 ]

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