Porsche in motorsport

Targa Florio winning 1973 Porsche 911 Carrera RSR in Martini Racing colours at the 2006 Goodwood Festival of Speed.

Porsche 956 and 962C, like this in Jägermeister livery, won the 24 Hours of Le Mans six years in a row in the 1980s.

Porsche has been successful in many branches of motorsport of which most have been in long distance races.

Despite their early involvement in motorsports being limited to supplying relatively small engines to racing underdogs up until the late 1960s, by the mid-1950s Porsche had already tasted moderate success in the realm of sports car racing, most notably in the Carrera Panamericana and Targa Florio, classic races which were later used in the naming of street cars. The Porsche 917 of 1969 turned them into a power house, winning in 1970 the first of over a dozen 24 Hours of Le Mans, more than any other company. With the 911 Carrera RS and the Porsche 935 Turbo, Porsche dominated the 1970s, and even has beaten sports prototypes, a category in which Porsche entered the successful 936, 956 and 962 models.

Porsche is currently the world's largest race car manufacturer. In 2006, Porsche built 195 race cars for various international motor sports events, and in 2007 Porsche is expected to construct no less than 275 dedicated race cars (7 RS Spyder LMP2 prototypes, 37 GT2 spec 911 GT3-RSRs, and 231 911 GT3 Cup vehicles).^[1]

Porsche regards racing as an essential part of ongoing engineering development—it was traditionally very rare for factory-entered Porsche racing cars to appear at consecutive races in the same specification. Some aspect of the car almost invariably, was being developed, whether for the future race programs or as proof of concept for future road cars.

Early years

As Porsche only had small capacity road and racing cars in the 1950s and 1960s, they scored many wins in their classes, and occasionally also overall victories against bigger cars, most notably winning the Targa Florio in 1956, 1959, 1960, 1964, and every year from 1966 to 1970 in prototypes that lacked horsepower relative to the competition, but which made up for that, with reliability, low drag, low weight and good handling.

In their September 2003 publication, Excellence magazine identified Lake Underwood as Porsche's quiet giant in the United States ^[2] and he is among the four drivers, including Art Bunker, Bob Holbert, and Charlie Wallace who are identified by the Porsche Club of America as having made Porsche a giant-killer in the USA during the 1950s and early 1960s.^[3] Notable early successes in the USA also included an overall win in the 1964 Road America 500 for an under-2-litre RS-60 driven by Bill Wuesthoff and Augie Pabst.

Porsche started racing with lightweight, tuned derivatives of the 356 road car, but rapidly moved on to campaigning dedicated racing cars, with the 550, 718, RS, and RSK models being the backbone of the company's racing programme through to the mid-1960s. The 90x series of cars in the 60s saw Porsche start to expand from class winners that stood a chance of overall wins in tougher races where endurance and handling mattered, to likely overall victors. Engines did not surpass the two litres mark until the rule makers limited the capacity of the prototype class to 3 litres after 1967, as the four-litre Ferrari P series and the seven-litre Ford GT40 became too fast. Porsche first expanded its 8-cyl flat engine to 2.2 litres in the 907, then developed the 908 with full three litres in 1968. Based on this 8-cyl flat engine and a loophole in the rules, the 4.5-litre flat 12 917 was introduced in 1969, eventually expanded to five litres, and later even to 5.4 and turbocharged. Within few years, Porsche with the 917 had grown from underdog to the supplier of the fastest (380 km/h at Le Mans) and most powerful (1580 hp in CanAm) race car in the world.

Five decades of Porsche 911 success

Even though introduced in 1963, and winning the Rally Monte Carlo, the Porsche 911 classic (built until 1989) established his reputation in production-based road racing mainly in the 1970s.

• Porsche 911 Carrera RSR, winner of the Targa Florio, Daytona and Sebring in the mid-1970s
• Porsche 934
• Porsche 935, winner in Le Mans 1979

Due to rules, the 911 was not used very much in the 1980s, but returned in the 1990s as the Porsche 993, like the GT2 turbo model. The water-cooled Porsche 996 series became a success in racing after the GT3 variant was introduced in 1999.

24 Hours of Le Mans successes

The 917 gave Porsche its first 24 Hours of Le Mans win in 1970.

The Porsche 917 is considered one of the most iconic racing cars of all time and gave Porsche their first 24 Hours of Le Mans win, while open-top versions of it dominated Can-Am racing. After dominating Group 4, 5, and 6 racing in the 1970s with the 911-based 934 and 935 and the prototype 936, Porsche moved on to dominate Group C and IMSA GTP in the 1980s with the Porsche 956/962C, one of the most prolific and successful sports prototype racers ever produced.

Porsche scored a couple of unexpected Le Mans wins in 1996 and 1997. A return to prototype racing in the USA was planned for 1995 with a Tom Walkinshaw Racing chassis formerly used as the Jaguar XJR-14 and the Mazda MXR-01 fitted with a Porsche engine. IMSA rule changes struck this car out of the running and the private Joest Racing team raced the cars in Europe for two years, winning back-to-back Le Mans with the same chassis, termed the Porsche WSC-95. This is a feat Porsche had also achieved in the 956 era, contrasting with the 1960s and 1970s where most cars ran only one or two races for the works before being sold on.

Between 1998 (when Porsche won overall with the Porsche 911 GT1-98) and 2014, Porsche did not attempt to score overall wins at Le Mans and similar sports car races, focusing on smaller classes and developing the water-cooled 996 GT3. Nevertheless, the GT3 and the LMP2 RS Spyder won major races overall during the period. Porsche returned to top-tier Le Mans racing in 2014 with the 919, but both cars experienced unknown engine issues with an hour and a half left to go and retired just as the #20 car was chasing down the #1 Audi in first place.

In 2015, a Porsche 919 Hybrid hybrid car driven by Nick Tandy, Earl Bamber and Nico Hülkenberg won the 83rd running of the 24 Hours of Le Mans. The Porsche LMP1 program went on to win the overall victory in the 2015 FIA World Endurance Championship. The 919 program has also gone on to win the 84th running of Le Mans in a 919 driven by Neel Jani, Romain Dumas, and Marc Lieb.

Teams and sponsorship

The original Porsche 935/78 "Moby Dick" in Martini Racing livery at the Porsche Rennsport Reunion IV.

In the 1960s, Porsche grew into a major competitor in sports car racing, sometimes entering half a dozen cars which were soon sold to customers. Apart from the factory team, calling itself Porsche AG or Porsche System Engineering since 1961, Austrian-based Porsche Salzburg was set up in 1969 as a second works team to share the work load, providing the much sought first overall win at Le Mans, in 1970. Martini Racing and John Wyer's Gulf Racing were other teams receiving factory support, allowing Zuffenhausen to focus on development, while the teams provided the sponsorship funds and manpower to be present and successful at many international races. In CanAm, Porsche cooperated with Penske, while in Deutsche Rennsportmeisterschaft, customers like Kremer Racing, Georg Loos and Joest Racing enjoyed various degrees of factory support. After appearing as Martini Porsche in the mid-1970s, the factory entered as Rothmans Porsche in the mid-1980s.

Many Porsche race cars are run successfully by customer teams, financed and run without any factory support; often they have beaten the factory itself.

Recently, 996-generation 911 GT3s have dominated their class at Le Mans and similar endurance and GT races. The late 1990s saw the rise of racing success for Porsche with The Racer's Group, a team owned by Kevin Buckler in Northern California. In 2002, Buckler won the 24 Hours of Daytona GT Class and the 24 Hours of Le Mans GT Class. In 2003, a 911 run by The Racers Group (TRG) became the first GT Class vehicle since 1977 to take the overall 24 Hours of Daytona victory. At the 24h Nürburgring, factory-backed Manthey Racing GT3 won since 2006. The team of Olaf Manthey, based at the Nürburgring, had entered the semi-works GT3-R in 1999.

Rally

Walter Röhrl's 1981 Porsche 924 GTS driven at the 2008 Rallye Deutschland.

The various versions of the Porsche 911 proved to be a serious competitor in rallies. The Porsche works team was occasionally present in rallying from the 1960s to late 1970s. In 1967 the Polish driver Sobiesław Zasada drove a 912 to capture the European Rally Championship for Group 1 series touring cars.^[4] Porsche took three double wins in a row in the Monte Carlo Rally; in 1968 with Vic Elford and Pauli Toivonen, and in 1969 and 1970 with Björn Waldegård and Gérard Larrousse. In 1970, Porsche also edged Alpine-Renault to win the International Championship for Manufacturers (IMC), the predecessor to the World Rally Championship (WRC). Porsche's first podium finish in the WRC was Leo Kinnunen's third place at the 1973 1000 Lakes Rally.

Although the Porsche factory team withdrew from the WRC with no wins to their name, the best private 911s were often close to other brands' works cars. Jack Tordoff was the first privateer to win an International Rally using a 911 2.7 Carrera RS Sport (Lightweight) on the Circuit of Ireland in 1973 (a round of the European Rally Championship). This success was followed by Cathal Curley who won the 1973 Donegal International Rally in a 911 2.7 RS Touring. Cathal Curley followed this with the greatest run of International Rally wins ever recorded in a Porsche Carrera RS when in 1974 he won the Circuit of Ireland, Donegal and Manx International Rallies in AUI 1500, the last Rhd 911 2.7 Carrera RS Sport produced by Porsche. In 1975 Cathal Curley upgraded to the new 3.0 Carrera RS in 1975 and won the Cork 20 which became an International Rally in 1977. Cathal Curley won four International Rallies in a 2.7 Carrera RS, multiple wins in mechanically standard cars straight off the showroom floor. These wins were all the more impressive as Ireland was the hot bed of International Rallying for the Porsche 911 RS in the 1970s. Jack Tordoff's victory was steady and deserved as he stalked the leading works backed Escort that failed on the penultimate stage beating this car and two other entered 911s but by 1974 Cathal Curley's wins came against no less than fourteen other 911 RSs beating the great Roger Clark in a works backed Escort in the 1974 Manx International Rally too. Over half of the UK allocation of 17 2.7 RS Sport (Lightweights) were rallied at any one time in Ireland in the 70's.

Jean-Pierre Nicolas managed to win the 1978 Monte Carlo Rally with a private 911 SC, and Porsche's second, and so far last, WRC win came at the 1980 Tour de Corse in the hands of Jean-Luc Thérier. In the European Rally Championship, the 911 was driven to five titles, and as late as 1984, Henri Toivonen took his Prodrive-built and Rothmans-sponsored 911 SC RS to second place behind Carlo Capone and the Lancia Rally 037. In 1984 and 1986, the Porsche factory team won the Paris Dakar Rally, also using the 911 derived Porsche 959 Group B supercar.

IMC results

Year	Car	Driver	1	2	3	4	5	6	7	8	9	IMC	Points
1970	Porsche 911 S	Björn Waldegård	MON 1	SWE 1	ITA	KEN	AUT 1	GRE Ret	GBR Ret			1st	28
		Gérard Larrousse	MON 2	SWE	ITA	KEN	AUT	GRE	GBR 6
		Åke Andersson	MON 4	SWE Ret	ITA	KEN	AUT Ret	GRE Ret	GBR Ret
		Jerry Larsson	MON	SWE 5	ITA	KEN	AUT	GRE	GBR
1971	Porsche 914/6	Björn Waldegård	MON 3									3rd	16.5
	Porsche 911 S			SWE 4	ITA	KEN Ret	MAR	AUT	GRE	GBR 2
	Porsche 914/6	Åke Andersson	MON Ret
	Porsche 911 S			SWE 6	ITA	KEN Ret	MAR	AUT	GRE	GBR

Formula One

1962 Porsche 804

McLaren MP4/2 Formula One car, powered by a TAG-Porsche engine

Despite Ferdinand Porsche having designed Grand Prix cars in the 1920s and 1930s for Mercedes and Auto Union, the Porsche AG never felt at home in single seater series.

The Porsche 718 RSK, a two-seater sports car, in the late 1950s was also entered in Formula Two races, as rules permitted this, and lap times were promising. The 718 first was modified by moving the seat into the center of the car, then also proper open wheelers were built. These 1500 cc cars enjoyed some success. The former F2 were moved up to Formula One in 1961, where Porsche's outdated design was not competitive. For 1962, a newly developed flat-eight powered and sleek Porsche 804 produced Porsche's only win as a constructor in a championship race, claimed by Dan Gurney at the 1962 French Grand Prix. One week later, he repeated the success in front of Porsche's home crowd on Stuttgart's Solitude in a non-championship race. At the end of the season, Porsche withdrew from F1 due to the high costs, just having acquired the Reutter factory. Volkswagen and German branches of suppliers had no interest in a F1 commitment as this series was too far away from road cars. Privateers continued to enter the out-dated Porsche 718 in F1 until 1964.

Having been very successful with turbocharged cars in the 1970s, Porsche returned to Formula One in 1983 after nearly two decades away, supplying water-cooled V6 turbo engines badged as TAG units for the McLaren Team. For aerodynamic reasons, the Porsche-typical flat engine was out of the question for being too wide and with turbo power being the way to go in F1 at the time a 90° V6 turbo engine. The TAG engine was designed to very tight requirements issued by McLaren's chief designer John Barnard. He specified the physical layout of the engine to match the design of his proposed car. The engine was funded by TAG who retained the naming rights to it, although the engines bore "made by Porsche" identification (initially Porsche were reluctant to have their name on the engines, fearing bad publicity if they failed. However, within a few races of the 1984 season when it became evident that the engines were the ones to have, the "Made by Porsche" badges began to appear). TAG-Porsche-powered cars took two constructor championships in 1984 and 1985, three driver crowns in 1984, 1985 and 1986. The engines powered McLaren to 25 victories between 1984 and 1987 (19 for 1985 and 1986 World Champion Alain Prost, and 6 for 1984 Champion Niki Lauda).

Despite its overwhelming success, the TAG-Porsche engines were never the most powerful in Formula One as they did not have the ability to hold higher turbo boost like the rival BMW, Renault, Ferrari and Honda engines. The McLaren drivers who regularly raced with the engine (Lauda, Prost, Keke Rosberg and Stefan Johansson) continually asked Porsche to develop a special qualifying engine like their rivals. However, both Porsche and TAG owner Mansour Ojjeh baulked at the requests due to the extra costs involved, reasoning that the proven race engines already had equal power and better fuel economy than all bar the Hondas, thus qualifying engines were never built. Though the lack of horsepower did not stop McLaren from claiming 7 pole positions (6 for Prost, 1 for Rosberg) and 21 front row starts.

Porsche returned to F1 again in 1991 as an engine supplier, however, this time with disastrous results: The Footwork Arrows cars powered with the overweight Porsche 3512 double-V6 which weighed 400 pounds (180 kg), (according to various reports, including from McLaren designer Alan Jenkins, the engine was in fact 2 combined TAG V6 engines used by McLaren from 1983 to 1987 minus the turbochargers)^[5] failed to score a single point, and failed even to qualify for over half the races that year. After the Porsche engines was sacked by Footwork in favor of Cosworth DFRs, Porsche has not participated in Formula One since. According to reports from Arrows, the 3512's major problem, other than a lack of horsepower, was severe oil starvation problems which often led to engine failure.

During the 2010 Paris Motor Show, Porsche chairman Matthias Mueller made a statement hinting to a possible Porsche return to Formula 1. Specifically, Mueller stated that either Porsche or Audi would compete in Le Mans while the other would turn to Formula 1. Previously, Audi's motorsport boss Wolfgang Ulrich had already stated that Audi and Formula 1 "do not fit".^[6]

Formula One results

Indy cars

Teo Fabi's 1988 Porsche 2708

V8 engine for the Indy 500-race

Porsche first attempted to compete in the 1980 Indianapolis 500 with an engine initially based on the 935 sports car flat 6 with Interscope Racing as the entrant and Danny Ongais as driver. The engine would be fitted to Interscopes's new Interscope IR01, which featured a tubular rear subframe, as the Porsche motor could not be used as a stressed member as the Cosworth engines were. USAC had more favorable rules for stock-block engines at the Indy 500 than CART allowed at their races. Porsche applied to and received approval from USAC for their engine to be allowed the stock block boost pressure of 55 inches. After setting an unofficial lap record in private testing at the now-defunct Ontario Motor Speedway, a clone of the Indiana track, rumors circulated regarding the performance of the engine and top-level teams pressured officials to alter their initial ruling and now categorize the Porsche a race motor, dropping boost pressure to 48" thus losing its boost and horsepower advantage. Porsche withdrew and Interscope entered a Parnelli VPJ6C-Cosworth DFXat Indianapolis that year. The Indianapolis engine became in the basis of the highly-successful 956/962 motor.

Porsche return to CART in its 1987 season fielding Al Unser in the #6 Quaker State Porsche, with the chassis and engine both being Porsche only competing at the Champion Spark Plug 300K at Laguna Seca Raceway. Unser would qualify 21st out of 24 cars and would retire in 24th place after only seven laps due to a water pump failure. For 1988 Teo Fabi would drive the #8 Quaker State March 88C-Porsche getting a best finish of 4th at the Bosch Spark Plugs Grand Prix at Pennsylvania International Raceway, Fabi would finish tenth in points. For 1989 Fabi would drive the #8 Quaker State March 89P-Porsche qualifying on the pole position at both the Budweiser / G.I. Joe's 200 at Portland International Raceway and the Red Roof Inns 200 at Mid-Ohio Sports Car Course getting the win at the latter. Fabi would also give Porsche their best finish on an IndyCar oval by finishing 2nd at the Marlboro 500 at Michigan International Speedway.

In 1990 Porsche attempted to race a new car with carbon-fiber chassis, but CART banned it.^[7] The team expanded to two cars, fielding Fabi in the #4 Foster's/Quaker State March 90P-Porsche and John Andretti in the #41 Foster's March 90P-Porsche. Fabi would qualify on the pole position at the Texaco/Havoline Grand Prix of Denver at the Streets of Denver and would finish 3rd at the Marlboro Grand Prix at the Meadowlands at the Meadowlands Sports Complex but would drop to 14th in points. While Andretti would get a best finish of 5th at the Budweiser Grand Prix of Cleveland at Burke Lakefront Airport and at the Molson Indy Vancouver at the Streets of Vancouver and would finish tenth in points.

Porsche withdrew from IndyCar at the end of the 1990 season. Team director Derrick Walker bought the assets to become the owner of Walker Racing.

Carrera Cup and amateur racing

Porsche has always been a popular marque for amateur racing GT and Production Sports Car racing in Europe, America and Asia, particularly the Porsche 911. Stock and lightly modified Porsches are raced in many competitions around the world; many of these are primarily amateur classes for enthusiasts.

Porsche has and continues to build models based on road cars but optimised for competition, most famously the Porsche 911 GT3 Cup. Porsche has established and supported several motor racing series, many of them single-model series for Porsches, or specific models of Porsche. Porsche Carrera Cup has featured in several countries and today variations of Carrera Cup have been held in Asia, Australia, Canada, France, Germany, Britain, Italy, Japan, the Middle East, the Netherlands, New Zealand, Scandinavia as well as originating IROC in the United States. A professional series evolved from these, the European-based Porsche Supercup.

Today

Penske Racing's Porsche RS Spyder in the 2008 Utah Grand Prix.

Porsche dropped its factory motorsports program after winning the 1998 24 Hours of Le Mans with the Porsche 911 GT1 for financial reasons, facing factory competition from Audi, BMW, Mercedes-Benz, Toyota and others. An LMP1 prototype with a V10 engine, intended to be entered in 2000, was abandoned unraced due to an agreement with Audi, a related company led by Porsche co-owner Ferdinand Piech. The V10 was used in the Porsche Carrera GT instead, while Audi dominated Le Mans after BMW, Mercedes and Toyota moved to F1.

Porsche made a comeback in the LMP2 category in 2005 with the new RS Spyder prototype, although this was run by closely associated customer teams rather than by the works. This was not welcomed very much, as rule makers intend the LMP1 category for factory entries, while the LMP2 should be reserved for privateers. Based on LMP2 regulations, the RS Spyder made its debut for Roger Penske's team at Mazda Raceway Laguna Seca during the final race of the 2005 American Le Mans Series season, and immediately garnered a class win in the LMP2 class and finishing 5th overall. The nimble albeit less powerful (due to the regulations) RS Spyder clearly possessed the pace to challenge Audi and Lola LMP1 cars in the ALMS. Penske Racing won the LMP2 championship on its first full season in 2006 and against Acura in 2007 and 2008. 2007 was the most successful year for the RS Spyder, winning 8 overall races and 11 class wins while the Audi R10 from the larger LMP1 class won only 4 overall victories. The car debuted on European circuits in 2008 and dominated the Le Mans Series; Van Merksteijn Motorsport, Team Essex and Horag Racing taking the first three places in the LMP2 championship. Van Merksteijn Motorsport took a class victory at the 2008 24 Hours of Le Mans and Team Essex won the LMP2 class at the 2009 24 Hours of Le Mans.

The Daytona Prototype Action Express Racing Riley-Porsche won the 2010 24 Hours of Daytona. This was unusual since the Riley-Porsche was powered by a Porsche Cayenne SUV based 5.0-litre V8. Porsche refused to develop the V8 for Grand-Am competition and was, instead, built by the Texas-based Lozano Brothers. Since it was not officially sanctioned by Porsche, the company will not technically claim the win.^[8]

Current factory drivers

• Earl Bamber
• Jörg Bergmeister
• Timo Bernhard
• Michael Christensen
• Romain Dumas
• Kévin Estre
• Brendon Hartley
• Wolf Henzler
• Neel Jani
• Marc Lieb
• Richard Lietz
• Patrick Long
• Frédéric Makowiecki
• Patrick Pilet
• Nick Tandy
• Mark Webber

^[9][10][11]

Former factory drivers

• Lucas Luhr
• Ryan Briscoe
• Hélio Castroneves
• Marco Holzer

Major victories and championships

• 12 World Sportscar Championship Manufacturers' and Team Titles: 1969, 1970, 1971, 1976, 1977, 1978, 1979, 1982, 1983, 1984, 1985, 1986
• 2 FIA World Endurance Championship Manufacturers' Titles: 2015, 2016
• 6 World Sportscar Championship Drivers' Titles: 1981, 1982, 1983, 1984, 1985, 1986
• 1 Intercontinental Le Mans Cup GT2 Team Title: 2010
• 18 24 Hours of Le Mans: 1970, 1971, 1976, 1977, 1979, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1994, 1996, 1997, 1998, 2015, 2016
• 18 12 Hours of Sebring: 1960, 1968, 1971, 1973, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 2008
• 18 Daytona 24 Hours as Manufacturer: 1968, 1970, 1971, 1973, 1975, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1985, 1986, 1987, 1989, 1991, 2003
• 11 Targa Florio: 1956, 1959, 1960, 1963, 1964, 1966, 1967, 1968, 1969, 1970, 1973
• 3 IMSA Supercar-Series: 1991, 1992, 1993
• 6 German Racing Championship: 1977, 1979, 1982, 1983, 1984, 1985
• 20 European Hill Climbing Championship
• 15 IMSA Supercar-Race (USA)
• 1 International Championship for Manufacturers: 1970
• 4 Rallye Monte Carlo: 1968, 1969, 1970, 1978
• 2 Paris-Dakar Rally: 1984, 1986
• 1 Formula One victory: 1962

TAG-Porsche engine in McLaren cars

• 3 Formula One World Drivers' Championships: 1984, 1985, 1986
• 2 Formula One World Constructors' Championships: 1984, 1985
• 25 Formula One victories: 1984, 12 wins; 1985, 6 wins; 1986, 4 wins; 1987, 3 wins

References

1. Watkins, Gary (7 March 2007). "Warehouse Shopping: Inside Porsche's Motorsport Centre". AutoWeek. Retrieved 2007-04-14.
2. "Excellence :: Back Issues". Excellence-mag.com. Retrieved 2010-11-24.
3. http://www.pca.org/join/history.html
4. Klein, Reinhard (2000). Rally Cars, pages 122-123. Germany: Konemann Inc.
5. "Lucky espace: the Porsche V12". Autosport. 2013-05-22. Retrieved 2013-05-16.
6. 1 October 2010 (2010-10-01). "Porsche's shock F1 return". Autocar. Retrieved 2010-11-24.
7. Future looks dim for Porsche - Joseph Siano, The New York Times, 1 July 1990
8. Smith, Steven (1 February 2010). "Action Express pulls off a stunning win at the Rolex 24 Hours of Daytona". AutoWeek. Retrieved 2010-02-01.
9. "Porsche Racing Drivers". Porsche. 2013. Retrieved 14 December 2013.
10. Dagys, John (2013-11-27). "Michael Christensen Named Porsche Factory Driver". sportscar365.com. John Dagys Media. Retrieved 2013-12-14.
11. "Works engagement with 919 hybrid and 911 RSR". porsche.com. Porsche. 2013-12-14. Retrieved 2013-12-14.

External links

• The official Porsche Motorsport website