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.
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
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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