The Porsche 935 K3 represents Kremer Racing’s highly developed interpretation of Porsche’s Group 5 contender and is considered among the most effective evolutions of the factory 935/77. Its reputation was firmly established at the 1979 24 Hours of Le Mans, where a Kremer-entered 935 K3 claimed overall victory against a field of prototypes— an achievement that underscored the car’s exceptional performance and engineering.

The Porsche 935 was developed for the World Championship for Makes during a period when sports car racing needed fresh interest. Under the FIA’s Group 5 “Special Production Car” regulations, manufacturers were required to base their race cars on production models built in at least 400 units, but were then allowed wide freedom to modify them for competition. As long as the car retained the basic outline and layout of the road car, engineers could extensively redesign it for performance. This freedom earned the class the nickname “silhouette formula.”

Porsche took full advantage of these rules, using the 930 Turbo as the foundation for a purpose-built competition car known as the 935.

Sharing its basic monocoque shell with the road car, the 935 incorporated a tubular spaceframe front structure, titanium suspension springs, ventilated disc brakes derived from the 917, and a 2.85-liter turbocharged flat-six producing around 590 horsepower. Combined with its distinctive aerodynamic flat-nose FRP bodywork, the 935 was a meticulously engineered machine that quickly dominated its rivals. From 1977 onward, Porsche made the model available to customer teams, and its widespread success led some to jokingly refer to the championship as a “935 one-make series.”

Among the private teams to challenge the factory effort, few were as successful as Cologne-based Kremer Racing, led by brothers Erwin and Manfred Kremer. Initially campaigning modified 911 RSR-based machines known as the 935 K1 and K2, they took a major step forward for the 1979 season with the development of the 935 K3. While visually similar to the factory 935/77, the K3 featured significant technical advancements. An aluminum roll cage extended to the suspension pickup points improved chassis rigidity, the gearbox was mounted inverted to lower the center of gravity, and power was delivered by a twin-turbocharged flat-six of up to 3.2 liters producing over 800 horsepower (with a 2.94-liter variant used for Le Mans).

Kremer Racing successfully campaigned the K3 in the World Championship for Makes, the Deutsche Rennsport Meisterschaft, and at Le Mans, while also offering cars and conversion packages to customers. Existing 935s and even 930 Turbos could be upgraded to K3 specification, leading to a number of K3-based cars being produced.

The example offered here, a 935 K3/80, is one such car. It was originally delivered in 1977 as a Porsche 930 Turbo, chassis number 9307700486, and retains its original owner’s manual. It is understood to have been sent to Kremer Racing around 1981 and converted to K3/80 specification, incorporating period upgrades including the distinctive large rear wing. It is currently equipped with a 3.0-liter engine in Le Mans specification.

While no major international race entries have been confirmed, the accompanying logbook documents competition use from 1981 through 1984, including appearances in ADAC autocross events. In more recent years, the car has returned to the track in well-known historic competitions, including the Le Mans Classic and it is supported by FIA HTP papers (which expired on December 31, 2025), confirming its eligibility for leading historic racing events.

Presented in race-ready condition, this 935 K3/80 represents an appealing opportunity to acquire and actively enjoy one of Kremer Racing’s most celebrated Group 5 designs in modern historic competition.