24-hour race on the Nürburgring 2013

The 24-hour race on the Nürburgring 2013 (spelling: 41st ADAC Zurich 24h race ) was the 41st edition of the 24-hour race on the Nürburgring and took place from May 17th to 20th, 2013.

The race had to be interrupted for 9:33 hours due to rain and fog. The race winners were Bernd Schneider , Jeroen Bleekemolen , Sean Edwards and Nicki Thiim in a Mercedes-Benz SLS AMG GT3 from the Black Falcon team with 88 laps covered.

background

The race took place for the first time on Pentecost and was not started on Saturday, but on Sunday at 5 p.m. The end was on Monday at the same time.

The DTM ran a race at the British Brands Hatch parallel to the 24-hour race , so that the DTM drivers could only intervene in the course of the race, the same applied to the WTCC drivers who drove a race on the Salzburgring . BMW drivers Augusto Farfus and Martin Tomczyk as well as Audi driver Mike Rockenfeller traveled from Brands Hatch during the race, last year's winner Marc Basseng from Salzburg. Farfus, however, did not even race because his vehicle, the BMW Z4 GT3 with starting number 19, had already retired at the time of his arrival at the Nürburgring.

So-called Code 60 zones were newly anchored in the regulations , in which yellow flags were waved twice and a speed limit of 60 km / h applied. Using GPS has been monitoring compliance with speed limits in Code-60 zones.

Balance of performance

The Balance of Performance ( German  balance of power ) is used to produce equality between the different GT cars. The DMSB can adjust several parameters for the 24-hour race on the Nürburgring. For GT4 vehicles, this includes the minimum weight, the tank capacity and, in the run-up to the race, the maximum performance on a roller dynamometer. For GT3 vehicles , there is also the diameter of the air flow limiter , the performance on an engine test bench and, for vehicles with charged engines, the maximum boost pressure.

For the 24-hour race at the Nürburgring 2013, the vehicles were classified in classes SP 9 (GT3 vehicles) and SP 10 (GT4 vehicles) as follows:

Class SP 10
Manufacturer	model	Minimum weight in kg	Tank capacity in liters	Air flow limiter	Max. Performance (engine test bench)	Max. Performance (roller test bench)	Others
Aston Martin	V8 Vantage N24	1350	100	-	-	420 hp	-
	GT4 2012 4.7	1375				455 hp
	GT4 2012 4.7 EVO	1400
BMW	M3 GT4	1395				435 hp
Porsche	997 CUP GT4	1330	85			405 hp
lotus	Evora GT 4	1280	90			400 hp
Ginetta	G50 GT4 2011 3.5	1060	85			320 hp
	G50 GT4 2012 3.7	1100	88			330 hp
Class SP 9
Manufacturer	model	Minimum weight in kg	Tank capacity in liters	Air flow limiter	Max. Performance (engine test bench)	Max. Performance (roller test bench)	Others
Audi	R8 LMS ultra	1325/1335 1	120	2 × 43.5 mm	538 hp	559 hp	-
Aston Martin	V12 Vantage GT3		125	2 × 35.0 mm	530 hp	551 hp
BMW	Z4 GT3	1300	110/115 2	1 × 70.0 mm	500 hp	520 hp
ford	GT	1275	110	1 × 54.5 mm	523 hp	544 hp
McLaren	MP4-12C	1325	125	2 × 35.0 mm	532 hp	553 hp	Boost pressure limitation
Mercedes Benz	SLS AMG GT3		120/123 2	2 x 34.8 mm	525 hp	546 hp	-
Nissan	GT-R	1335	125	2 × 40.0 mm	530 hp	551 hp	Boost pressure limitation
Porsche	GT3R	1300/1290 3	110	1 × 50.0 mm	504 hp	525 hp	-
	GT3 Cup S	1250	100	1 x 72.3 mm	-	-
	GT3 Cup	1150	90	-

¹ After the top 40 qualifying, the minimum weight was increased to slow the cars down in the race after they had proven to be slightly superior there.

² After the Top 40 qualifying, the maximum tank capacity was increased to enable the vehicles to cover nine laps on one tank of fuel.

³ After the Top 40 qualifying, the minimum weight was reduced because the vehicles were too loud and had to be equipped with two additional silencers.

In addition, minimum pit times have been set for vehicles of classes SP 6 , SP 7 , SP 8 , SP 8T , SP 9 , E1-XP1 and E1-XP2 , as the teams had tried in the previous year to use the tank restrictors, which only allowed the fuel to run at a set speed in the tanks to get around. The minimum pit times increased with the number of laps driven in the race segment, which began with the start of the race or the last time you left the pit lane and ended when you entered the pit lane. The minimum pit times were measured between the pit entry line and the pit exit line. For the last 90 minutes of the race, this rule was overridden to allow a short stop to refuel ( splash and dash ).

	Minimum pit times in s
Laps driven	for 1st pit stop after the start of the race	from the 2nd pit stop after the start of the race
1	57	49
2	74	66
3	91	83
4th	108	100
5	125	117
6th	142	134
7th	159	151
8th	176	168
9	193	185
10	211	203
11	228	220

Vehicle classes

The 24-hour race was announced for the following vehicle classes:

class	Vehicle type, cubic capacity
24h special and E1-XP
SP 2T	over 1350 cm³, up to 1600 cm³, with turbocharger
SP 3	over 1750 cm³, up to 2000 cm³
SP 3T	over 1600 cm³, up to 2000 cm³, with turbocharger
SP 4 1	over 2000 cm³, up to 2500 cm³
SP 4T	over 2000 cm³, up to 2600 cm³, with turbocharger
SP 5 1	over 2500 cm³, up to 3000 cm³
SP 6	over 3000 cm³, up to 3500 cm³
SP 7	over 3500 cm³, up to 4000 cm³
SP 8	over 4000 cm³, up to 6250 cm³
SP 8T	over 2500 cm³, up to 4000 cm³, with turbocharger
SP 9	GT3 vehicles
SP 10	GT4 vehicles
D1T 2	Diesel vehicles, over 1750 cm³, up to 2000 cm³
D2T	Diesel vehicles, over 2000 cm³, up to 2500 cm³
D3T 2	Diesel vehicles, over 2500 cm³, up to 3000 cm³
D4T	Diesel vehicles, over 3000 cm³, up to 6250 cm³
AT	Gas and biodiesel vehicles
E1-XP1	Special vehicles, over 1750 cm³, up to 3000 cm³
E1-XP2	Special vehicles, over 3000 cm³, up to 6250 cm³
E1-XP hybrid	Special vehicles, hybrid drive, over 1,750 cm³, up to 6,250 cm³
VLN production car
V 2	over 1750 cm³, up to 1800 cm³
V 3	over 1800 cm³, up to 2000 cm³
V 4	over 2000 cm³, up to 2500 cm³
V 5	over 2500 cm³, up to 3000 cm³
V 6	over 3000 cm³, up to 3500 cm³
Group N vehicles
N 2	Group N, over 1750 cm³, up to 2000 cm³
N 3	Group N, over 2000 cm³, up to 2500 cm³
N 4	Group N, over 2500 cm³, up to 3000 cm³
N 5	Group N, over 3000 cm³, up to 6250 cm³
Cup vehicles
Cup 1	Opel Astra OPC Cup vehicles

¹The classes SP 4 and SP 5 were merged due to insufficient number of participants.

²Classes D1T and D3T were merged due to insufficient number of participants.

free training

Free practice should take place on Friday at 2:25 p.m. and last 90 minutes. Due to thick fog, however, the training had to be postponed by 30 minutes and shortened to 60 minutes.

The fastest was the Mercedes-Benz SLS AMG GT3 with starting number 23 from Rowe Racing with a lap time of 10: 18.667 minutes, followed by the Audi R8 LMS ultra with starting number 29 and the Porsche 997 GT3 R from FALKEN Motorsports . In total, only 133 vehicles achieved a timed lap.

Qualification training

Qualifying started on Friday at 7:35 p.m. and on Saturday at 11:20 a.m. While the first training session was supposed to last just under four hours, the Saturday training session was scheduled to last two hours.

The first qualification training took place in the wet, but the track began to dry out towards the end of the training session. The fastest was starting number 10 with a lap time of 8: 39.989 minutes, the Mercedes-Benz SLS AMG GT3 from Team Black Falcon , 1.178 seconds ahead of the Nissan GT-R from Schulze Motorsport with starting number 123. Behind it was already more than 11 seconds The backlog of the Audi R8 LMS ultra from Team Mamerow with starting number 2.

In the second qualifying, the track was dry, so the drivers were able to significantly improve their lap times from the first practice session. Here, too, the car with starting number 10 was the fastest with a lap time of 8: 23.181 minutes, followed by three Audi R8 LMS ultra with starting numbers 29, 4 and 2 as well as another Mercedes-Benz from Rowe Racing. The fifth placed was less than 2 seconds behind.

The training had to be stopped one minute before the time ran out because the Gazoo Racing team's Toyota GT86 had come off the lane in the Breidscheid area and crashed into the guardrails.

Top 40 qualifying

The Top 40 qualifying introduced last year started on Saturday at 5:50 p.m.

The ten best-placed vehicles from the qualifying sessions of the VLN Langstreckenmeisterschaft Nürburgring events prior to the 24-hour race and the 30 fastest vehicles from the two qualifying sessions were eligible to participate in the Top 40 qualifying. The vehicles were lined up at the start and finish line, and the vehicles started every ten seconds. After a warm-up lap on the Nordschleife, the participants started flying into two qualifying laps.

The top 40 qualifying was dominated by the vehicles of class SP 9 , which took the first 18 places. The ten fastest vehicles were within just 5 seconds. The number 4 Audi R8 LMS ultra from Phoenix Racing started from pole position with a time of 8: 17.212 minutes, followed by the number 7 works Aston Martin Vantage GT3 and an Audi R8 LMS ultra des with a gap of 1.150 seconds Team Mamerow with starting number 2, which was 1.861 seconds behind. The fastest car in another class was the Porsche 911 GT3 RSR from Manthey Racing with starting number 18, which competed in class SP 7 and achieved a lap time of 8: 23.990 minutes.

Only 39 of the 40 qualified teams took part in the final decision on the starting grid. The Porsche 997 GT3 R from Timbuli Racing with starting number 35 could not take part after an accident. The team also failed to repair the vehicle for participation in the race. The number 69 McLaren MP4-12C from Dörr Motorsport lost a wheel during the warm-up lap due to a defect in the rim, so that it was unable to complete a timed lap and had to start the race from 39th on the grid.

Race course

The race started at 5:00 p.m. After the weather was still sunny on Sunday morning, the first raindrops fell shortly before the start, but it initially remained dry.

The # 69 McLaren MP4-12C already suffered engine damage on the warm-up lap and was unable to start the race.

At the start, the Audi R8 LMS ultra with start number 4 took the lead, ahead of the Aston Martin Vantage with start number 7 and the Audi R8 LMS ultra with start number 1. The fourth-placed Audi R8 LMS ultra with start number 2 broke at the end of the first lap on the Döttinger height of the front spoiler . The car had to go to the pit twice for repairs and was able to continue the race just under two laps behind.

The Mercedes-Benz SLS AMG GT3 with starting number 10 from Team Black Falcon also fell far behind. On the Nordschleife, after being touched by another participant, the left rear suspension broke and a return to the pits was only possible at slow speed. The subsequent repair took more than an hour.

Even in starting groups two and three, there were several contacts between the vehicles at the beginning of the race, some of them on the Grand Prix track.

On lap six there was a code 60 zone at the Schwedenkreuz , the vehicles had to brake to 60 km / h at this point. This led to a backwater that ended exactly behind a difficult to see passage. Uwe Alzen drove to the end of the traffic jam in the number 19 BMW Z4 GT3 and saw the last vehicle on the chain so late that he could no longer avoid a collision. This was the BMW Z4 of his teammates with the starting number 20, which lost about one lap to the top during the subsequent pit stop. The vehicle with starting number 19 had to be withdrawn later.

After the first hour two Audi R8s (starting numbers 4 and 1) led the field, with the Aston Martin with starting number 7 in third place.

After three hours the Aston Martin with starting number 7 was leading after it had passed the Audi with starting number 4 in a kilometer-long wheel-to-wheel duel on the Döttinger Höhe. Behind was the Audi with starting number 1, followed by the BMW Z4 with starting number 26, the Manthey-Porsche with starting number 50 and the best-placed Mercedes-Benz, the car with starting number 22 from Rowe Racing.

After 3:50 hours of driving, the rain that had already been expected set in. At this point in time, the two Audi R8 LMS ultra cars with starting numbers 1 and 4 were in the lead, with the front runner having completed one pit stop less. This was followed by the two Porsches of the Manthey team with starting numbers 18 and 50 and the Aston Martin with number 7. The Mamerow Audi with starting number 2 had dropped to 51st, the Black Falcon Mercedes with starting number 10 to 133rd. Shortly afterwards, the second Timbuli Racing Porsche (starting number 45) retired after an accident while lapping a slower vehicle.

At around 10:45 p.m. the race was interrupted after a racing time of 5:45 hours due to the persistent rain and fog.

At the time of the cancellation, the number 26 BMW Z4 of the Marc VDS Racing Team was in the lead . Since the result of the previous lap was counted when the race was stopped, the team slipped back to third behind the Aston Martin and the Manthey Porsche with starting number 18. This was followed by the Audi R8 LMS ultra with starting number 1, the second BMW Z4 from the Marc VDS Racing Team (starting number 25) and the second Manthey-Porsche (starting number 50).

The restart was scheduled for 8:00 a.m., after an introductory lap the race resumed with a flying start at around 8:20 a.m. The interruption was counted as a safety car phase, i.e. time intervals were canceled, lap intervals remained.

In wet conditions, the two BMW Z4s from the Marc VDS Racing Team quickly took the lead together with the Audi R8 LMS ultra from the Phoenix team (car number 1). When the track dried out, three Mercedes-Benz AMG SLS GT3s took the lead and were able to hold onto these positions until the last hour of the race. The number 25 BMW Z4 had meanwhile dropped to fourth place. Maxime Martin , who drove the last stint in the BMW Z4, was able to shorten the gap to the leading Mercedes-Benz by 20 seconds per lap and move up to second place in the final laps. In the final phase, Martin set the fastest race lap in 8: 22.088 minutes, which was less than five seconds above the best time in the top 40 qualifying.

The race was won by starting number 9, the Mercedes-Benz SLS AMG GT3 from Black Falcon with Bernd Schneider , Jeroen Bleekemolen , Sean Edwards and Nicki Thiim . For Schneider it was the first ever finish at this race. Bleekemolen had already left on Monday morning because his wife was expecting twins. For Mercedes-Benz as well as for all four drivers and the Black Falcon team, it was the first victory in the 24-hour race at the Nürburgring.

Second place went to the Marc VDS Racing Team's BMW Z4 (starting number 25) with Maxime Martin , Andrea Piccini , Yelmer Buurman and Richard Göransson . The podium was completed by the Mercedes-Benz of the Rowe Racing Team (starting number 22) with drivers Klaus Graf , Thomas Jäger , Jan Seyffarth and Nico Bastian , who crossed the finish line just 0.158 seconds ahead of their teammates with starting number 23.

Of the 173 vehicles that started, 136 vehicles were included in the ranking, i.e. after the 24 hours had passed, they had crossed the finish line and completed the required 50% of the number of laps of the winner.

Results

Final ranking

Class winners are marked in bold .

Item	class	No.	team	driver	vehicle	Round
1	SP 9	9	Black Falcon	Bernd Schneider Jeroen Bleekemolen Sean Edwards Nicki Thiim	Mercedes-Benz SLS AMG GT3	88
2	SP 9	25th	BMW Sports Trophy Team Marc VDS	Maxime Martin Andrea Piccini Yelmer Buurman Richard Göransson	BMW Z4 GT3	88
3	SP 9	22nd	ROWE Racing	Klaus Graf Thomas Jäger Jan Seyffarth Nico Bastian	Mercedes-Benz SLS AMG GT3	87
4th	SP 9	23	ROWE Racing	Lance David Arnold Alexander Roloff Jan Seyffarth Thomas Jäger	Mercedes-Benz SLS AMG GT3	87
5	SP 9	1	G-Drive Racing by Phoenix	Mike Rockenfeller Marcel Fässler Frank Stippler Markus Winkelhock	Audi R8 LMS ultra	87
6th	SP 9	20th	BMW Team Schubert	Dirk Adorf Claudia Hürtgen Jens Klingmann Martin Tomczyk	BMW Z4 GT3	87
7th	SP 7	18th	Manthey Racing	Marc Lieb Romain Dumas Lucas Luhr Timo Bernhard	Porsche 911 GT3 RSR	87
8th	SP 9	4th	Phoenix Racing	Michael Ammermüller Frank Stippler Ferdinand Stuck Johannes Stuck	Audi R8 LMS ultra	86
9	SP 9	3	G-Drive Racing by Phoenix	Frank Biela Christer Jöns Luca Ludwig Roman Rusinov	Audi R8 LMS ultra	86
10	SP 9	7th	Aston Martin Racing	Darren Turner Stefan Mücke Allan Simonsen Pedro Lamy	Aston Martin V12 Vantage GT3	86
11	SP 9	50	Manthey Racing	Marco Holzer Nick Tandy Jörg Bergmeister Richard Lietz	Porsche 911 GT3 R.	85
12	SP 9	8th	Haribo Racing Team	Richard Westbrook Emmanuel Collard Mike Stursberg Hans Guido Riegel	Porsche 911 GT3 R.	85
13	SP 7	12	Wochenspiegel Team Manthey	Georg Weiss Oliver Kainz Michael Jacobs Jochen Krumbach	Porsche 911 GT3 RSR	84
14th	SP 7	77	Raceunion Teichmann Racing	Jos Menten Stefan Landmann Stef van Campenhout Rodney Forbes	Porsche 911 GT3 Cup	84
15th	SP 7	55	Black Falcon Team TMD Friction	David Jahn Steve Jans Hannes Plesse Maik Rosenberg	Porsche 911 GT3 Cup	84
16	SP 9	11	Team Klaus Abbelen	Klaus Abbelen Sabine Schmitz Patrick Huisman Patrick Pilet	Porsche 997 GT3 R.	84
17th	SP 9	24	Walkenhorst Motorsport powered by Dunlop	Henry Walkenhorst Ralf Oeverhaus Max Partl Wolf New Year's Eve	BMW Z4 GT3	83
18th	SP 9	15th	Audi race experience	Rahel Frey Dominique Bastien Marco Werner Alex Yoong	Audi R8 LMS ultra	82
19th	SP 9	63	Black Falcon	Vimal Mehta Khaled Al Qubaisi Daniel Keilwitz Christian Bracke	Mercedes-Benz SLS AMG GT3	82
20th	SP 9	44	Falken Motorsports	Wolf Henzler Peter Dumbreck Martin Ragginger Sebastian Asch	Porsche 997 GT3 R.	82
21st	SP 8	81	Team Tobias Guttroff	Tobias Guttroff Joachim Kiesch Volker Strycek Arno Klasen	Corvette C6	81
22nd	SP 7	47	Team Peter Schmidt	Peter Schmidt Johannes Siegler Chris Zöchling Klaus Koch	Porsche 911 GT3 Cup	81
23	SP 4T	105	Besaplast Racing Team 1	Franjo Kovac Martin Tschornia Fredrik Lestrup Kurt Thiim	Audi TT RS	81
24	SP 7	39	Team Willie Moore	Willie Moore Bill Cameron Peter Bonk	Porsche 997 GT3 Cup	81
25th	SP 3T	111	Raeder Motorsport	Elmar Deegener Jürgen Wohlfahrt Christoph Breuer Dieter Schmidtmann	Audi TT RS 2.0	80

literature

• 24 STUNDEN NÜRBURGRING NORDSCHLEIFE 2013 , Group C Motorsport Verlag Duisburg, ISBN 978-3-928540-72-8

Web links

• Official website of the ADAC Zurich 24h race
• 41st ADAC Zurich 24h race. Official Result. ADAC Nordrhein eV, January 28, 2014 (PDF).

Individual evidence

1. ↑ Mario Fritzsche & Dominik Sharaf: Premiere: Mercedes wins tough "Ring" marathon. Motorsport-Total.com, May 20, 2013, accessed May 21, 2013 . 
2. ↑ Bulletin No. 3 of May 14, 2013 on the approved tender for the 41st ADAC Zurich 24h Race May 17 to 20, 2013 DMSB Reg.-No. 1/2013 from November 8, 2012. (PDF; 174 kB) (No longer available online.) Walter Hornung, May 14, 2013, archived from the original on June 12, 2013 ; Retrieved May 22, 2013 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
3. ↑ ^{a b} Dominik Sharaf: New GPS monitoring: Race management is watching you. Motorsport-Total.com, May 19, 2013, accessed May 21, 2013 . 
4. ↑ 41st ADAC Zurich 24h - Race 2013. Balance of Performance ratings for classes SP10, SP9, E1-XP, SP8 and SP7 (SP8, SP7 if different from Appendix 5). (PDF; 68 kB) (No longer available online.) ADAC Nordrhein eV, May 7, 2013, archived from the original on June 12, 2013 ; accessed on February 4, 2014 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
5. ↑ ^{a b c} Nürburgring 24h Race 2013 BoP: New technology classification shortly before the start. sportauto.de, May 19, 2013, accessed on July 19, 2013 . 
6. ↑ Bulletin No. 3 of May 14, 2013 on the approved tender for the 41st ADAC Zurich 24h Race May 17 to 20, 2013 DMSB Reg.-No. 1/2013 from November 8, 2012. (PDF; 174 kB) (No longer available online.) Walter Hornung, May 14, 2013, archived from the original on June 12, 2013 ; accessed on February 4, 2014 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
7. ↑ Announcement 41st ADAC Zurich 24h Race. (PDF; 1882 kB) (No longer available online.) ADAC Nordrhein eV, archived from the original on February 22, 2014 ; Retrieved July 23, 2013 . 
8. ↑ ^{a b} 41st ADAC Zurich 24h race. (PDF) Provisional Result by class. (No longer available online.) ADAC Nordrhein eV, May 20, 2013, archived from the original on January 12, 2014 ; accessed on February 4, 2014 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
9. ↑ Mario Fritzsche & Dominik Sharaf: Rainy start on the Nordschleife. Motorsport-Total.com, May 17, 2013, accessed July 19, 2013 . 
10. ↑ 41st ADAC Zurich 24h Race. (PDF; 144 kB) Result Free practice. (No longer available online.) ADAC Nordrhein eV, May 17, 2013, archived from the original on August 18, 2013 ; Retrieved July 19, 2013 . 
11. ↑ 41st ADAC Zurich 24h Race. (PDF; 155 kB) Result 1st qualifying. (No longer available online.) ADAC Nordrhein eV, May 18, 2013, archived from the original on December 22, 2015 ; Retrieved July 19, 2013 . 
12. ↑ 41st ADAC Zurich 24h Race. (PDF; 158 kB) Result 2nd qualifying. (No longer available online.) ADAC Nordrhein eV, May 18, 2013, archived from the original on August 18, 2013 ; Retrieved July 19, 2013 . 
13. ↑ Mario Fritzsche & Dominik Sharaf: Second qualifying: Black Falcon continues to push the pace. Motorsport-Total.com, May 18, 2013, accessed July 19, 2013 . 
14. ↑ 41st ADAC Zurich 24h Race. (PDF; 158 kB) Result QUALIFYING. (No longer available online.) ADAC Nordrhein eV, May 18, 2013, archived from the original on June 13, 2013 ; Retrieved May 21, 2013 . 
15. ↑ Phoenix-Audi takes pole position at the "Ring". Motorsport-Total.com, May 18, 2013, accessed May 22, 2013 . 
16. ↑ ^{a b} Dominik Sharaf: For bright yellow it turns out pitch black: Timbuli is packing up. Motorsport-Total.com, May 19, 2013, accessed May 22, 2013 . 
17. ↑ ^{a b} Björn Tolksdorf: 24h at the Nürburgring: Dörr Motorsport. The whims of the McLaren. Motor-Talk.de, May 20, 2013, accessed on July 19, 2013 . 
18. ↑ Mario Fritzsche & Dominik Sharaf: Starting phase at the "Ring": three-way battle at the top. Motorsport-Total.com, May 19, 2013, accessed May 21, 2013 . 
19. ↑ Mario Fritzsche & Dominik Sharaf: Mamerow: Front splitter damage is a mystery. Motorsport-Total.com, May 19, 2013, accessed May 21, 2013 . 
20. ↑ Schubert: Sixth place is poor consolation. Motorsport-Total.com, May 20, 2013, accessed May 21, 2013 . 
21. ↑ 41st ADAC Zurich 24h Race. (PDF; 137 kB) split result after 01h. (No longer available online.) ADAC Nordrhein eV, May 19, 2013, archived from the original on June 12, 2013 ; accessed on February 6, 2014 . 
22. ↑ Mario Fritzsche & Dominik Sharaf: After three hours: Aston Martin is leading. Motorsport-Total.com, May 19, 2013, accessed July 19, 2013 . 
23. ↑ 41st ADAC Zurich 24h Race. (PDF; 140 kB) split result after 04h. (No longer available online.) ADAC Nordrhein eV, May 19, 2013, archived from the original on August 18, 2013 ; accessed on February 6, 2014 . 
24. ↑ 41st ADAC Zurich 24h Race. (PDF; 105 kB) Result interrupt. (No longer available online.) ADAC Nordrhein eV, May 20, 2013, archived from the original on June 12, 2013 ; Retrieved May 21, 2013 . 
25. ↑ Mario Fritzsche & Dominik Sharaf: 24-hour race released again. Motorsport-Total.com, May 20, 2013, accessed May 21, 2013 . 
26. ↑ Mario Fritzsche & Dominik Sharaf: Marc VDS celebrates Eifel magician Martin. Motorsport-Total.com, May 20, 2013, accessed May 21, 2013 . 
27. ↑ ^{a b c} 41st ADAC Zurich 24h race. (PDF) Official Result. (No longer available online.) ADAC Nordrhein eV, January 28, 2014, archived from the original on March 10, 2014 ; accessed on March 10, 2014 . 
28. ↑ Mario Fritzsche & Dominik Sharaf: Black Falcon brings Mercedes historic triumph. Motorsport-Total.com, May 20, 2013, accessed May 21, 2013 .