The original base was a 924 Turbo chassis with chassis number 93A0150562. The vehicle was initially built as a Carrera GT and bore the license plate BB P 693 at that time. As development progressed, it evolved into the first 924 Carrera GTS with the current chassis number WP0ZZZ93ZBS710001 and engine number 4710036.
Even within the later GTS series, this Porsche remained unique. It is the only 924 Carrera GTS finished in Grand Prix White and, at the same time, the only one built in Weissach. The remaining 58 vehicles were built in Zuffenhausen and painted in Guards Red. Only left-hand-drive models were produced. The base price at the time was 110,000 DM gross; the Rally Package II, available as an option, cost an additional 42,400 DM. Registration was only possible through a German individual approval process at the TÜV.
Even the technical documentation reveals the high standards with which Porsche developed the GTS. The water-cooled inline four-cylinder engine has a displacement of 1,984 ccm, a bore of 86.5 mm, and a stroke of 84.4 mm. In the documented configuration of this test vehicle, the turbocharged engine produces 270 PS at 6,250 rpm and delivers 335 Nm at 3,000 rpm. The boost pressure is 1.1 bar, fuel injection is handled by K Jetronic, and the engine features a dry-sump lubrication system.
Power is transmitted via a reinforced Porsche five-speed transmission with oil cooling and splash lubrication. It is complemented by a 40-percent limited-slip differential, which ensures that power is transferred to the rear wheels in a controlled manner even during spirited driving.
For the suspension, Porsche employed a sophisticated design. The front axle features triangular control arms and McPherson struts, while the rear uses aluminum trailing arms with coil springs. Stabilizer bars and Bilstein gas-pressurized shock absorbers round out the setup. The braking system is derived from the 911 Turbo and features internally ventilated and perforated brake rotors, as well as four-piston fixed-caliper brake calipers and corresponding Turbo wheel hubs.
Particularly impressive is the consistency with which weight reduction was implemented. The body features numerous components made of fiberglass-reinforced plastic (FRP) and plastic, including the hood, spoiler, and doors. The side windows and rear window were constructed using lightweight materials. Inside, the rear seats and sound-deadening material were omitted; instead, the car features racing seats modeled after those in the Porsche 935, harness belts, and a permanently integrated aluminum roll cage.
The forged Fuchs rims are fitted with 7 J x 16 tires in the front and 8 J x 16 tires in the rear. The test vehicle’s documentation lists 225/50 ZR 16 tires on the front axle and 245/45 ZR 16 tires in the rear. With a weight of just 1,060 kilograms and an output of 270 PS, this results in an exceptional power-to-weight ratio. The historical records indicate a top speed of 260 kph and acceleration from 0 to 100 kph in 5.2 seconds.
From Development Vehicle to Historical Artifact
After its active development phase, the Porsche initially remained in service. It was used for testing and test drives and was also deployed in the context of rally events. The documentation describes it, among other things, as a test car in Weissach and as a chase car at rallies. Of particular interest is its deployment at the 1982 San Remo Rally, where Jürgen Barth drove this vehicle to provide support for Walter Röhrl.
After this active period, the car was finally stored at Porsche in Weissach. There, it fell into obscurity for about a decade. For a vehicle that played a direct role in the development of the 924 Carrera GTS, its story would have come to a very early end.
Porsche race mechanic Werner Hillburger eventually rescued it from obscurity and completely rebuilt the car in the early 1990s. It was re-registered in 1994. In 2001, the GTS was acquired by Peter Voigt before passing into the hands of its current owner in March 2007—a man who owns an impressive collection of original rally cars and who regularly races some of them himself, including as a co-driver for Walter Röhrl.
Since then, the car has undergone another thorough restoration and comprehensive technical overhaul. Today, the 924 Carrera GTS is once again fully operational and is occasionally driven at events across Europe. What ultimately makes this Porsche so extraordinary, therefore, is not just its low production volume.
It is the combination of its early origins in the Porsche development department, its role as a prototype for GTS development and Group 4 homologation, its unique production in Weissach, and its technical design as an uncompromising competition car.
Added to this is the fact that its story did not end with its time at Porsche. After years of obscurity, it was rescued, rebuilt, and preserved over the course of decades. Today, we have a vehicle that offers a very direct insight into Porsche’s motorsport development in the early 1980s.
Conclusion: An extraordinary piece of Porsche history. As the first 924 Carrera GTS and the only one in Grand Prix White, this prototype holds a very special place. With just 29,000 km on the odometer and only three previous owners, it combines a remarkable history with a special connection to the original vehicle. A car that is not only rare but truly one of a kind.
This vehicle is the first of 59 cars that Porsche produced through February 28, 1981, as a small evolutionary series of pure competition cars following the end of production of the 406
924 Carrera GT road sports car. It is the only one in Grand Prix White and the only GTS built in Weissach; all 58 others are uniformly painted in Guards Red and were built in Zuffenhausen. Only left-hand-drive models were produced. This vehicle was originally built as a prototype in November 1980 in the development department based on a 924 Turbo chassis with chassis number 93A0150562 as a Carrera GT and was later registered with the license plate BB-P 693 as the first GTS with chassis number WPOZZZ93ZBS710001 and engine number 4710036. The prototype was used to prepare for the TÜV certification tests and to apply for Group 4 homologation; it is therefore equipped with Group 4 homologation parts for club racing, such as dry-sump lubrication. It served as a test car for Porsche engineer Roland Kussmaul in Weissach and as a chase car at rallies; Jürgen Barth had a minor accident with this vehicle while driving it to provide support for Walter Röhrl at the 1982 San Remo Rally.
Each GTS could only be registered with an individual TÜV approval and only in Germany—either directly or via a German customs number.
After 1982, this vehicle was used for testing purposes and for dealer test drives before it was stored at the Porsche Development Center in Weissach, where it fell into obscurity for a decade. Porsche race mechanic Werner Hillburger saved the vehicle from being scrapped and completely rebuilt it in the early 1990s, registering it as LB-RR 54 in 1994. He sold it in 2001 to Peter Voigt, who registered it with the license plate BB-939.
The current owner purchased the vehicle in March 2007. Following a thorough restoration, the vehicle is now fully operational again and is occasionally entered in events across Europe.
- “Rally Package II”
- Porsche 924 Carrera GTS Prototype
- Vehicle No. 1 – Chassis No. 001
- The only 924 Carrera GTS built in white at Weissach
- Mileage: 29,000 km
- 3 previous owners
- From a renowned rally collection
1981 
