From 1997 Audi Sport boss Wolfgang Ullrich evaluated options for Le Mans entry. Audi commissioned [[dallara|Dallara]] to build an open-top roadster designated the Audi R8R, powered by a 550 hp V8 turbo, and simultaneously commissioned [[racing-technology-norfolk|Racing Technology Norfolk]] under Tony Southgate to build a closed-cockpit LMGTP coupé designated the Audi R8C using the same drivetrain. At the 1999 [[12-hours-of-sebring|12 Hours of Sebring]] the R8R demonstrated strong pace. At Le Mans, the R8Cs suffered gearbox failures and lap times 10 seconds behind the leaders; the R8Rs ran steadily to third and fourth overall behind the surviving BMW V12 LMR and a Toyota. Audi regrouped and built a new spyder configuration for 2000 together with Joest and Dallara.
The R8 is powered by a 3.6-litre Audi V8 with Fuel Stratified Injection (FSI), an early application of gasoline direct injection technology later deployed across the Volkswagen Group's road-car range. Official power outputs were 610 hp (455 kW) in 2000–2002, reduced to 550 hp in 2003–2004 and 520 hp in 2005 following ACO restrictor mandates; works sources suggested the Le Mans cars produced approximately 670 hp at speed due to twin ram-air intakes activating above 240 km/h. Drive went to the rear wheels via a Ricardo six-speed sequential gearbox with electropneumatic paddle shift. Body and structure were built entirely from carbon fibre. The car's highest recorded speed at Le Mans was 338 km/h (210 mph) during the 2002 practice sessions.
A distinctive feature of the R8's architecture was its modular rear assembly: the transmission, rear suspension, and rear subframe formed a single removable unit, allowing the Joest crew to swap the entire rear transaxle in as little as three minutes and 16 seconds. The ACO responded by mandating that the gearbox casing could not be changed during a race, though the R8 retained faster access to gearbox internals than any competitor.
The Joest works team, driven by [[tom-kristensen|Tom Kristensen]], [[emanuele-pirro|Emanuele Pirro]], and [[frank-biela|Frank Biela]], recorded a 1–2–3 finish at Le Mans on the car's debut in 2000. The R8 won the American Le Mans Series manufacturers' title six consecutive times from 2000 to 2005, the European Le Mans Series title in 2001, and the Le Mans Series title in 2004. Following the works team's withdrawal after 2002, privateer entries continued winning at Le Mans in 2004 and 2005.
The 2005 Le Mans victory was also Tom Kristensen's sixth consecutive and record seventh overall Le Mans win, surpassing [[jacky-ickx|Jacky Ickx]]'s previous record of six. Tragedy struck the programme on 25 April 2001 when ex-Formula 1 driver [[michele-alboreto|Michele Alboreto]] died in a high-speed tyre-failure accident during an R8 test session at the Lausitzring.
In 2003 the [[bentley-speed-8|Bentley Speed 8]] broke the R8's Le Mans winning streak; that car used a heavily modified 4.0-litre version of the R8's V8 engine. Audi developed the [[audi-r10-tdi|Audi R10 TDI]] turbodiesel successor and the R8 made its final competitive appearance in the American Le Mans Series on 1 July 2006 at Lime Rock Park, winning the race to mark the type's 50th ALMS victory. The road-going [[audi-r8|Audi R8]] sports car launched in 2007 takes its name and styling inspiration from the race car.
This article is based solely on the supplied corpus. No external sources were consulted; claims that could not be substantiated against the corpus were omitted under the drop-the-claim rule.
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