Audi R15 TDI

Audi R15 TDI at the 2009 24 Hours of Le Mans

Category

Le Mans Prototype (LMP1)

Constructor

Audi

Technical specifications

Chassis

Carbon fibre monocoque

Suspension (front)

Double wishbone, torsion bar with separate damper, anti-roll bar

Suspension (rear)

Double wishbone, torsion bar with separate damper, anti-roll bar

Engine

Audi TDI 5.5 litre V10 turbodiesel,mid-engined, longitudinally mounted

Transmission

5-speed S-tronic

Weight

appr. 900 kg (1,984 lb)

Fuel

Shell V-Power Diesel

Tyres

Michelin

Competition history

Notable entrants

Audi Sport Team Joest

Notable drivers

Tom Kristensen

Allan McNish

Rinaldo Capello

Marco Werner

Lucas Luhr

Mike Rockenfeller

Timo Bernhard

Romain Dumas

Alexandre Prémat

André Lotterer

Marcel Fässler

Benoît Tréluyer

Debut

2009 12 Hours of Sebring

Races	Wins	Poles	Fastest laps
10	3	1	2

Constructors' Championships

Drivers' Championships

	2009 Audi R15 TDI 2010 Audi R15 TDI plus
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The Audi R15 TDI, commonly abbreviated to the R15, is a Le Mans Prototype (LMP)racing car constructed by the German car manufacturer Audi AG. It is the successor to the Audi R10 TDI. Like its predecessor, the R15 TDI uses a turbocharged diesel engine, although the R15's V10 engine is physically smaller than the R10's V12. The smaller engine is pushed further toward the middle of the car than in the R10, resulting in a more neutral weight balance that gives the car better agility around the corners than its predecessor.

The car was tested for the first time in December 2008, before its official unveiling and competition debut at the 2009 12 Hours of Sebring race, 21 March 2009. Three R15 TDIs participated in the 24 Hours of Le Mans in June 2009, under the control of Joest Racing. Audi did not defend their American Le Mans Series, or Le Mans Series titles with the R15 TDI.

The R15 made its competition debut at the 2009 12 Hours of Sebring in March 2009, and followed this event at the 24 Hours of Le Mans in June. The R15 got off to a perfect start by winning the 12 Hours of Sebring, setting a new race record in the process, but then lost in its second entry.Peugeot, its rival, with its 908 HDi FAP, took the top two spots in the 24-hour race, ending Audi's five-win streak that lasted back to 2004 with the gasoline-powered R8.

The R15 TDI features a 5.5 litres (336 cu in)Turbocharged Direct Injection (TDI)turbodiesel V10 engine, rated at over 600 PS (440 kW; 590 bhp) and 1,050 newton metres (774 ft·lbf) torque. The electrical system uses a lithium-ion battery, a first for Audi sports prototypes, as well as LED headlights,and a unique system of LED rear lights that are mounted on the rear wing endplate.

In the week running up to the 2009 24 Hours of Le Mans, rivals Peugeot lodged a protest against the R15, claiming that its bodywork did not comply with regulations stating that parts of the bodywork cannot be fitted with the sole purpose of generating downforce. However, after the Wednesday free practice session, the ACO rejected Peugeot's protest.At the 2009 Le Mans, Audi was unable to continue its winning streak that dated back to 2004. The #3 R15 ran off at Indianapolis corner, and the #2, driven by Luhr, crashed and retired. In the evening, the #1 Audi lost a lap to the leading Peugeot which was faster, and further technical issues dropped it a full 7 laps down the order. The sole surviving Audi clinched a podium win, finishing in third place.

Audi announced on August 25, 2009 that two R15s would race at the 2009 Petit Le Mans. Both Audis led for approximately 90% of the race but a late spin during the final rain-soaked caution handed the victory to one of the Peugeot 908 HDi FAPs entered by Team Peugeot Total. This loss was Audi's first since competing in Petit Le Mans since their initial attempt at Road Atlanta back in 2000.

R15 TDI Plus

In response to losing the 24 Hours of Le Mans and the Petit Le Mans to the Peugeot 908s, Audi updated their R15 for the 2010 season, creating the R15 plus. 2010 Regulations reduced the size of diesel LMP1 air restrictors and turbocharger boost pressure. However, despite this Audi's engineering team led by Dr Ulrich Baretzky were able to achieve engine power and performance that was comparable to the 2009 powerplant. Aerodynamic efficiency was also a major area of focus for 2010. The frontal area of the car was redesigned to reveal the raw crash structures. The front fenders were also lowered in an effort to reduce drag while the concept of air running through the car was abandoned for a more conventional design. The air channel that exited to the side of the car was redesigned resulting in a more conventional configuration, and a new headlight concept was introduced. Audi stated that they had improved the fuel tank and cooling system as well.

Racing history

At the 2010 24 Hours of Le Mans, the three Joest Racing-entered R15s finished on the podium.

The new vehicle was a success at the 2010 8 Hours of Le Castellet, winning 5 laps ahead of the next competitor Aston Martin. The Oreca Peugeot, which was supposedly its rival, dropped a full 8 laps down the order because of the airjacks failed to come off. Audi continue to go flat out and in the end finished 10 laps ahead of the Peugeot. Audi had now been able to achieve both the speed and reliability combination that they considered sufficient to match the Peugeot challenge for Le mans. A full squad of 3 cars was entered for the next race which was the 2010 Spa 1000 km, finishing 3rd (#7, behind the two Peugeots - #3 took 1st, #2 took 2nd), 5th (#9) and 12th (#8) respectively. Audi treated the race as a setup exercise for car configuration at Spa that would then be used for the 2010 24 Hours of Le Mans.

The 2010 24 Hours of Le Mans race got off to a tightly contested start with Peugeot occupying the top spots (as they did for qualifying) and for a large part of the race. However, it was apparent throughout the race that Audi were able to match pace with the Peugeots, but were working according to a different race strategy. By pushing the French manufacturer to the limit, three of the Peugeot cars experienced engine problems due to connecting rod failure towards the latter part of the race. With engine troubles for three of the Peugeots that forced the cars to retire before the end of the race, and an early exit by the #3 due to a suspension failure, the three Audis would finish 1-2-3 (the #9 took 1st, #8 took 2nd and #7 took 3rd), with all cars exceeding the previous distance record of 5,335.313 km (3,315.210 mi) set in the 1971 raceby Dr Helmut Marko and Gijs Van Lennep: the winning #9 car, led by Mike Rockenfeller and two Porsche factory drivers Timo Bernhard and Romain Dumas, set not only a record-tying number of laps around Le Mans of 397 laps, but eclipsed the distance record outright at a distance of 5,410.7 km (3,362.1 mi).

Audi R15 at Sebring 2011

Post-Le Mans Audi did not collect any more victories and lost all 3 remaining races to the Peugeot 908, which happened to be part of the ILMC championship. Audi fielded 2 cars into the Silverstone 1000 km but the #7 crashed and retired. The sole remaining #8 finished 3rd. At Petit Le Mans 2 cars were entered but both lost to a Peugeot 1-2 victory. At the R15's last race, 2 cars were entered into the Zhuhai 1000 km. Both cars were leading the 908s by 30 seconds after Sebastian Bourdais make contact with a GT2 Porsche. A late safety car session saw the Audi's lead shrink to 13 seconds. Afterwards a controversial team-work by Peugeot saw the #1 908 slowed down the #7 Audi enough to let the #2 Peugeot come out of the pits just 2 seconds ahead. The race ended with Peugeot #2 winning 4 seconds ahead of the Audi. Audi did not win the LMP1 Le Mans Series team championship nor the ILMC LMP1 championship.

The R15's final race was at the 2011 Sebring 12 Hours. Both cars ran in 2010 configuration with new restrictors. The #1 Audi finished 5th overall after 2 consecutive tyre punctures and rear bodywork damage in the hands of Mike Rockenfeller. Later in the race the #1 had to serve a penalty for speeding in pitlane. The #2 ran at the front exchanging the lead with Peugeot until a shunt by one of the Peugeots at turn 17 put Capello out of contention with a suspension failure. The #2 finished 4th overall, albeit 5 laps down from the winning Oreca Peugeot. Throughout its career the R15 won 3 of the 10 races it entered; Sebring in 2009, Paul Ricard and Le Mans in 2010.

Future

With a change in Le Mans Prototype engine regulations planned for 2011 Audi is working on a successor to the R15 TDI, known as the R18.In interview with Autosport Magazine, the head of Audi's Motorsport programme Doctor Wolfgang Ullrich stated that the R18 will be a closed roof coupe similar to the 908, however Ullrich did not state the car would be a hybrid or what fuel it will be running on. What he did state however is that one of the advantages of an open-top prototype has been lost with the recent regulation changes: open-top prototypes often shorten pit times compared to closed coupes; however with pit times slowed down due to new rules requiring only one man with one airgun in the pits, the advantage has been negated. The R18 would be Audi's first-ever coupe since the failed Audi R8C in 1999; the Bentley Speed 8(which won in 2003 with Audi-developed engines) were also closed prototypes. Along with the Peugeot 908 HDi FAP (replaced with a new generation 908), the R15 TDI will be replaced; however, due to developmental reasons, the R15 TDI will make its final run at the 2011 12 Hours of Sebring under the R15 plus plus configuration.

Technical data

Audi R 15 TDI
Design	Le Mans Prototype (LMP1)
Motor type	V10-Diesel motor with turbocharger
Engine displacement	5500 cc
Power	over 440 kW (590 HP)
Torque	1050 Nm (774 lb ft)
V_max	over 330 km/h (205 mph)
Drive wheels	Rear wheels
Gearbox	CFK-gearbox
Transmission	sequential, pneumatic actuated 5-gear
Brakes	2-circuit hydraulic braking system, carbon fibre disc brakes front and back
Length	4,650 mm (183.1 in)
Width	2,000 mm (78.7 in)
Height	1,030 mm (40.6 in)
Fuel tank capacity	81 L (21 US gal; 18 imp gal)
Weight	min. 900 kg (1,984 lb)