Introduced in 1976, the Porsche 934 was the official Group 4 racing version of the 930 Turbo. Having homologated the model by producing the required 400 road-going 930 Turbos over two consecutive years, Porsche constructed just 31 examples of the pure-bred racer.

Built around a standard galvanized 930 bodyshell, the 934 was transformed with a full aluminium roll cage, a stripped interior containing only a single racing seat with harness, and additional instrumentation for monitoring boost pressure. Power was adjustable between 480 and 560 bhp via a dashboard dial, giving the 1,120 kg car an extraordinary power-to-weight ratio of roughly 2 kg per horsepower.

The 934 retained the production 930’s four-speed gearbox and iconic whale-tail spoiler, as required by the regulations. This prevented the fitment of the large air-to-air intercooler used on the works 2.1-litre Turbo RSRs. Porsche’s solution was characteristically clever: water radiators mounted in the front spoiler circulated coolant to twin heat exchangers in the engine bay, dropping intake charge temperatures from 300 °F (149 °C) down to 120 °F (49 °C).

The front compartment housed a 144-litre fuel cell, oil tank, and battery, all reinforced by a substantial aluminium cross-brace. Upgraded running gear included 917-derived finned brake calipers with ventilated and cross-drilled discs, strengthened hubs, and centre-lock wheels measuring 10.5 inches wide at the front and a massive 16 inches at the rear.

When the prototype 934, driven by Manfred Schurti, lapped the Nürburgring 15 seconds faster than the best 3.0-litre Carrera RSRs, the message was clear. By early 1976, most top European GT teams abandoned their RSRs and switched to the new 934.
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Chassis 0158 was delivered new by Porsche’s Competition Department to Erwin and Manfred Kremer in Cologne. Financed by German privateer Gerhard Holup, the car was primarily campaigned by Holup in national events, while the Kremer brothers retained rights to enter it in major World and European Championship races with professional drivers.

In 1976, #0158 made its mark on the international stage. Bob Wollek, Didier Pironi, and Marie-Claude Beaumont shared driving duties at the Le Mans 24 Hours, while Reinhold Joest, Jürgen Barth, and Bob Wollek contested the 6 Hours of Dijon.

For the 1977 season, the car was sold to Dieter Schornstein, who ran a full season in the German DRM Championship under Sekurit sponsorship. Schornstein contested all ten rounds and raced the 934 a total of 20 times that year. On occasion the car competed in Group 5 specification, fitted with a larger 935-style rear wing.

In 1978, Schornstein upgraded to a new 935 and sold #0158 back to Gerhard Holup. Holup teamed up with Edgar Dören and ran the car under Weralit tool manufacturer sponsorship, prepared by the Max Moritz team. For the 1978 Le Mans 24 Hours, the car was entered by Kremer in striking orange Jägermeister livery, driven by Holup, Dören, Hervé Poulain, and Romain Feitler. It retired after 16 hours with transmission failure, but across its seven international outings that season, #0158 secured one class win and two second-place finishes in GT.

The car retained its orange livery for the remainder of 1978. In 1979 it was repainted in its familiar white with green and red stripes and continued under Weralit sponsorship. Competing in the DRM (now open to Group 4 cars running alongside faster Group 5 machinery), Edgar Dören drove #0158 to four victories — enough to clinch the overall German championship.

After four intense seasons and 66 races — including two starts at Le Mans and two at the Nürburgring 1,000 km — chassis 0158’s European career came to an end. It was sold to American enthusiast Jack Refenning in Florida. In 1980–81, Refenning campaigned the car in IMSA GTO, contesting the Daytona 24 Hours and Sebring 12 Hours. In its final race, the 1981 Daytona 24 Hours, #0158 finished a respectable 9th overall.


Ownership history of # 930 670 0158
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1st owner:
Gerhard Holup (D, 1976)

2nd owner:
Dieter Schornstein (D, 1977)

3rd owner:
Gerhard Holup (D, 1978 - 1979)

4th owner:
Jack Refenning (USA, 1980 - ?)

5th owner:
Jean Paul Richard (F, 1991 - 2004)

6th owner:
Manfred Freisinger (D, 2004 - 2012)

7th owner:
Private collector (UK, 2012 – 2013) 

8th owner:
John Minshaw (UK 2013 – 2014)

9th owner:
John C Rothenberger (USA, 2014 – 2017) 

10th Owner:
Pascal Duhamel (UAE, 2017 – 2018)

11th Owner:
Private collector (USA, 2018 – current)

We are delighted to offer this highly significant and historically correct Porsche 934, chassis 0158.A true veteran with approximately 70 competitive starts, the car contested two 24 Hours of Le Mans, two Nürburgring 1,000 km races, two Daytona 24 Hours, the 12 Hours of Sebring, and numerous other major international events. It was driven by some of the era’s finest pilots, including Bob Wollek, Didier Pironi, Edgar Dören, and others.

Presented in the iconic ELF livery it wore at the 1976 24 Hours of Le Mans, the car is accompanied by a comprehensive history file, current FIA HTP papers, and a detailed 2006 appraisal by renowned Porsche historian Ulrich E. Trispel.

Meticulously restored and maintained to the highest standards, this famous 934 represents a rare opportunity for the serious collector or historic racer. It is highly eligible for prestigious events such as Le Mans Classic and the Classic Endurance Racing Series.
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Competition history # # 930 670 0158

21.03.76
AvD-  Race "Bergischer Löwe" Zolder (B)
(1. race for the German  Rundstreckenpokal)
Gerhard  Holup 
4^th
‍Group 2, 4 und 5 nat. 

04.04.76
11.  
ADAC 300 km, Nürburgring (D)
(2. race for the German Rundstreckenpokal)
Gerhard  Holup
8
DNF
Group  2, 4 und 5 nat. 

11.04.76
"Jim  Clark Race", Hockenheim (D)
(3. race for the German Rundstreckenpokal)
Gerhard  Holup
937
4^th
‍Group  2, 4 und 5 nat. 

25.04.76
AvD -  Airport Race Sembach, Trie (D)
(4. race for the German Rundstreckenpokal)
Gerhard  Holup
93
DNF
Group  2, 4 und 5 nat.
Start  collision with Schütz

02.05.76
39.  ADAC- Eifel Race, Nürburgring (D)
(1. race for the German  Rennsport-Meisterschaft)
Gerhard  Holup
7
DNF
Division  1
Collision  with Kannacher

23.05.76
AvD -  Airport Race Mainz- Finthen (D)
(2. race for the German Rennsport-  Meisterschaft)
Gerhard  Holup
108^th
‍Division  1 

12/13.06.76
44. Le  Mans 24 Hours (F)
(no world championship status)
Bob Wollek/
Didier  Pironi/
Marie C. Beaumont
65
19^th 4^th 2^nd
Overall Group  4- all Classes Group  4 > 3000 ccm
2 x  changing the clutch

20.06.76
DMV-  Rhein Pokal- Race, Hockenheim (D)
(3. race for German Rennsport-  Meisterschaft)
Gerhard  Holup
6
7th
Division  1 

27.06.76
ADAC-  Norisring Trophy, Nürnberg (D)
(3. race for GT- European Championship)
Bob  Wollek
6
DNF
All  classes Transmission  failure

25.07.76
ADAC-  Airport Race Diepholz (D)
(5. race for the German Rennsport Meisterschaft)
Gerhard  Holup
12
7^th
Division  1 

01.08.76
AvD-  Rheinland Pfalz- Trophy, Nürburgring (D)
(6. race for the German Rennsport  Meisterschaft)
Gerhard  Holup 
DNS
Division  1
Accident  in training

29.08.76
AvD-  Trophy of the Nations, Hockenheim (D)
(8. race for the German Rennsport  Meisterschaft)
Gerhard  Holup
104
4^th
Division  1 

04.09.76
6  Hours Dijon (F)
(7. race Manufacturers’ World Championship)
Reinhold  Jöst/Jürgen  Barth/Bob  Wollek
7
8^th 1^st
All  classes
Group  4- class 

19.09.76
Trofeo  Armando Bevilacqua, Imola (I)
(6. race for GT European Championship)
Hans  Heyer 
2^nd
All  classes 0.3  sec. behind

26.09.76
ADAC  Trophy from Baden W. Hockenheim (D)
(10. race for the German Rennsport  Meisterschaft)
Hartwig  Bertrams
6
7th
Division  1 

10.10.76
ADAC-  Nürburgring- Trophy (D)
Gerhard  Holup
2
3^rd Group  2, 4 und 5 nat. 

17.10.76
ADAC-  End of season race Zolder (D)
Gerhard  Holup
6
5^th
Division  1 

23.10.76
Trophy  of Neus, Nürburgring (D)
Dieter  Schornstein 
1^st Group  2, 4 und 5 nat.
Test  drive

31.10.76
ADAC-  South-West Trophy, Hockenheim (D)
(7. race for the GT- European Championship)
Hans  Heyer
7
3^rd
All  classes 

13.03.77
AvD -  Race "Bergischer Löwe", Zolder (B)
(1. race for the German  Rennsport- Meisterschaft)
Dieter  Schornstein
6
17^th
Division  1 

27.03.77
12.  ADAC - 300 km, Nürburgring (D)
(2. race for the German Rennsport-  Meisterschaft)
Dieter  Schornstein
6
16^th 4^th
Division  1
Group  2, 4 und 5 nat. 
Additional  race

17.04.77
Jim  Clark Race, Hockenheim (D)
(1. race for the German Rundstreckenpokal)
Dieter  Schornstein
496
4^th
Group  4 > 3000 ccm 

24.04.77
2.  ADAC- Airport Race Sylt (D)
(2. race for the German Rundstreckenpokal)
Dieter  Schornstein 
1^st
Group  4 > 3000 ccm
Overall  winner

01.05.77
40.  ADAC- Eifel Race, Nürburgring (D)
(3. race for the German Rennsport-  Meisterschaft)
Dieter  Schornstein
61
6^th
Division  1 

08.05.77
ADAC-  Airport Race Kassel- Calden (D)
(4. race for the German Rennsport  Meisterschaft)
Dieter  Schornstein
61
DNF
Division  1 

15.05.77
Avd-  "100 Miles of Hockenheim" (D)
(4. race for the German  Rundstreckenpokal)
Dieter  Schornstein
224
1^st
Group  4 > 3000 ccm 

22.05.77
Airport  Race Mainz Finthen (D)
(5. Race for the German Rennsport- Meisterschaft)
Dieter  Schornstein
61
8^th
Division  1 

29.05.77
ADAC -  100 km Race, Nürburgring (D)
(4. Race for Manufacturers’  World Championship)
Dieter  SchornsteinG. von  Tschirnhaus
6
5^th 4^th
All  classes
Group  .5 > 2000 ccm 

12.06.77
ADAC -  Trophy of Luxemburg, Nürburgring
Dieter  Schornstein 
1^st
Group  .5 > 2000 ccm
(Le  Mans- Weekend)

26.06.77
ADAC -  Rundstr. Race Düren, Zolder (B)
(8. race for the German Rundstreckenpokal)
Dieter  Schornstein 
2^nd
Group  .5 > 2000 ccm 

03.07.77
ADAC-  Norisring Trophy, Nürnberg (D)
(6. race for the German Rennsport  Meisterschaft)
Dieter  Schornstein
61
7^th 10^th
Division  1
All  classes  
Additional  race

24.07.77
10.  ADAC - Airport Race Diepholz
(7. Race for the German Rennsport Meisterschaft)
Dieter  Schornstein
61
5^th Division  1 

31.07.77
AvD-  Rheinland- Pfalz- Trophy
(8. Race for the German Rennsport Meisterschaft)
Dieter  Schornstein
61
DNF
Division  1 

07.08.77
11.  ADAC- Airport Race Mainz- Finthen
(9. race for the German Rundstreckenpokal)
Dieter  Schornstein
5
1^st
Group  4> 3000 ccm 

14.08.77
11.  ADAC- Westfalen- Trophu, Zolder (B)
(9. race for the German Rennsport  Meisterschaft)
Dieter  Schornstein
61
6^th
Division  1 

28.08.77
2.  ADAC- Nürburgring- Trophy (D)
Dieter  Schornstein
73
DNS
Group  5 > 2000 ccm
Engine  failure

25.09.77
6  hours, Brands Hatch (GB)
(7. race for Manufacturers’ World Championship)
Dieter  Schornstein
Alain  Peltier
4
10^th
All  classes
Rain  during race, abort

02.10.77
4.  ADAC- Super Sprint, Nürburgring (D)
(10. race for the German Rennsport-  Meisterschaft)
Dieter  Schornstein
6
18^th
Division  1 

09.10.77
ADAC –  Rennsport Finale, Hockenheim (D)
(8. race for the Manufacturers’ World  Championship)
Dieter  Schornstein
Alain  Peltier
6
8^th
All  classes  

19.03.78
6  Stunden von Mugello (I)
(2. race for the Manufacturers’ World Championship)
Gerhard  Holup
Edgar  Dören
27
12^th 2^nd
All  classes
Group 4- class  

02.04.78
ADAC-  Goodyear 300, Nürburgring (D)
(2. race for the German Rennsport  Meisterschaft)
Edgar  Dören
20
8^th
Division  1 

16.04.78
6  Stunden von Dijon (F)
(3. race for the Manufacturers’ World Championship)
Edgar  Dören
Gerhard  Holup
38
16^th 7^th
All  classes Group 4- class
Race  reduced to 4 hours (due to weather)

14.05.78
6  Stunden von Silverstone (GB)
(4. race for the Manufacturers’ World  Championship)
Edgar  Dören
Gerhard  Holup
23
DNF
All  classes
Accident  in lap 55

28.05.78
24.  ADAC- 1000 Km- Rennen, Nürburgring (D)
(5. race for the Manufacturers’ World  Championship)
Edgar  Dören
Gerhard  Holup
46
DNF
All  classes 

10/11.06.78
46. Le  Mans 24 hours (F)
(5. race for the long distance – Drivers’ World  Championship)
Edgar  Dören
Gerhard  Holup
Hervé  Poulain
Romain  Feitler
68
DNF
All  classes
Transmission  failure (16hrs)
Sponsor:  Jägermeister

25.06.78
6  Stunden von Misano (I)
(6. race for the Brands - World Championship)
Gerhard  Holup
Edgar  Dören
Eckhard  Schimpf
26
8^th 2^nd
All  classes
Group 4 class
Sponsor:  Jägermeister

20.08.78
ADAC-  Westfalen- Pokal- rennen Zolder (B)
(9. race for the German Rennsport-  Meisterschaft)
Gerhard  Holup
31
8^th
Division  1
Sponsor:  Jägermeister

03.09.78
6  Stunden von Vallelunga (I)
(8. race for the Manufacturers’ World  Championship)
Edgar  Dören
Gerhard  Holup
24
8^th 1^st
All  classes
Group  4- class
Sponsor:  Jägermeister

17.09.78
ADAC-  Norisring Trophäe, Nürnberg
(10. race for the German Rennsport-  Meisterschaft)
Edgar  Dören
20
6^th
Division  1
Sponsor:  Jägermeister

01.10.78
5.  ADAC - Super-Sprint Nürburgring (D)
(11. race for the German Rennsport-  Meisterschaft)
Edgar  Dören
41
8^th 1^st
Division  1
Group  4- class
Sponsor:  Jägermeister

15.10.78
ADAC -  End of Season Race, Zolder (B)
Gerhard  Holup
24
11^th 2^nd
Group  5- Race
Group  4- Race
Sponsor:  Jägermeister

11.03.79
AvD-  Rennen "Bergischer Löwe", Zolder (B)
(1. race for the German  Rennsport- Meisterschaft)
Edgar  Dören
71
10^th 1^st
Division1
Group  4 

25.03.79
Luxemburg  Trophy, Goodyear Str. (LUX)
Edgar  Dören 
2^nd
Group  4 

08.04.79
"Jim-  Clark- Rennen", Hockenheim (D)
(2. race for the German Rennsport-  Meisterschaft)
Edgar  Dören
71
9^th 1^st
Division  1
Group  4 

29.04.79
42.  ADAC – Eifel Rennen, Nürburgring (D)
(3. race for the German Rennsport  Meisterschaft)
Edgar  Dören
71
12^th 2^nd
Division  1
Group  4 

20.05.79
ADAC –  Bavaria Rennen, Salzburgring (A)
(4. race for the German Rennsport  Meisterschaft)
Edgar  Dören
71
9^th 2^nd
Division  1
Group  4 

17.06.79
AvD -  Flugplatzrennen Mainz - Finthen (D)
(5. race for the German Rennsport-  Meisterschaft)
Edgar  Dören
71
7^th 1^st
Division  1
Group  4 

24.06.79
ADAC –  Norisring Trophäe, Nürnberg
(6. race for the German Rennsport- Meisterschaft)
Edgar  Dören
71
11^th 4^th
Division  1
Group  4 

01.07.79
ADAC -  Trophy Zandvoort (NL)
(7. race for the German Rennsport Meisterschaft)
Edgar  Dören
71
8^th 1^st
Division  1
Group  4 

22.09.79
12. ADAC  - Flugplatzrennen Diepholz (D)
(8. race for the German Rennsport  Meisterschaft)
Edgar  Dören
71
11^th 3^rd
Division  1
Group  4 

19.08.79
ADAC –  Westfalen Pokal Rennen, Zolder (D)
(9. race for the German Rennsport  Meisterschaft)
Edgar  Dören
71
10^th 2^nd
Division  1
Group  4 

02.09.79
ADAC-  Hessen Cup, Hockenheim (D)
(10. race for the German rennsport Meisterschaft)
Edgar  Dören
71
12^th 4^th
Division  1
Group  4
Engine  failure

23.09.79
6.  ADAC - Super-Sprint Nürburgring (D)
(11. race for the German Rennsport-  Meisterschaft)
Edgar  Dören
71
14^th 6^th
Division  1
Group  4
Black  flag Lost  oil  (37 laps)

07.10.79
ADAC  Hessenpreis Kassel - Calden (D)
(Race for the Interserie)
Friedrich  Glatz 
6^th 1^st
All  classes
Group 4 

14.10.79
ADAC -  End of Season Race, Zolder (D)
Gerhard  Holup
30
10^th 1^st
Group  2, 4 und 5 nat.
Group  3 und 4 
Additional  race

04.11.79
ADAC –  Rheintal Race Hockenheim (D)
Edgar  Dören 
2^nd
Group  3 und 4 > 3000 ccm 

02/03.02.80
24  Hours Daytona (USA)
(1. race for the Brands - World Championship)
Jack  Refenning
Ray  Mummery
Ren  Tilton
24
DNF
IMSA  GTO 

21.03.81
12  Hours Sebring (USA)
(2. Race for the IMSA- Series)
Jack  Refenning
Ren  Tilton
Peter  Welter
24
DNF
IMSA  GTO 

04.07.81
Paul  Revere 250, Daytona (USA)
Ren  Tilton
24
4^th
All  classes 

29.11.81
Camel  GT 250, Daytona (USA)
Jack  Refenning
Ren  Tilton
24
DNF
IMSA  GTO 

30/31.01.82
24  Hours Daytona (USA)
(1. Race for the IMSA- Series)
Jack  Refenning
Ren  Tilton
Rusty  Bond
24
9^th 3^rd
All  classes IMSA GTO 


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