The Audi R462956 was initially equipped with a 4.2 litre V8 engine. Specifically, it is an all-aluminium alloy 32-valve (four valves per cylinder) petrol engine, Fuel Stratified Injection (FSI), and has a displacement of 4,163 cubic centimetres (254.0 cu in). It develops a motive power output of 420 metric horsepower (309 kW; 414 bhp) (Directive 80/1269/EEC), and generates 430 newton metres (317 ft·lbf) of torque,on 98 RON 'Super Unleaded' petrol. It is basically the same engine used in the Audi B7 RS4, but is modified to use dry sump lubrication system. This V8 is a highly reworked, high-revving variant of the existing 4.2 litre V8, but includes cylinder-direct fuel injection (Fuel Stratified Injection), and four valves per cylinder, instead of five (as used on the previous non-FSI variants). It also uses two chain-driven double overhead camshafts (DOHC) per cylinder bank, and utilises variable valve timing for both inlet and exhaust camshafts. The 4 wheel drive system is bias towards the rear, it only sends 30% of its power to the front wheels and the other 70% to the rear which means impressive handling.
The transmission options are either a Lamborghini sourced six-speed manual gearbox with metal gate for the shift lever, or an Audi-developed R tronic gearbox—which is a semi-automatic, without a traditional clutch pedal with automatic gears shifting mode. These options are the same as those available on the Lamborghini Gallardo. A double clutch direct-shift gearbox (DSG), now badged by Audi as S tronic, is not available (as of April 2010).
[edit] Spyder
On July 1, 2010 Autocar reported that Audi has added the 4.2 FSI V8 engine to the R8 Spyder range. The 434 PS (319 kW; 428 bhp) (up 14 bhp on coupé), 430 newton metres (317 ft·lbf) unit now completes the R8 Spyder range alongside the launch V10 powerplant. It has a 0-62 mph (0–100 km/h) time of 4.8sec and will go on to reach a top speed of 185 mph (299 km/h). The engine is available with Audi's R tronic sequential manual gearbox. Like the V10 model, the V8 Spyder features an aluminium spaceframe with carbon composites and an automatic retractable folding cloth roof.
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