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The invention of the Targa bodystyle and the introduction of the turbocharger for series production cars are key milestones in Porsche's storied history. While the G-Series 911 Turbo Targa is well-known, a Targa version of the transaxle model series cars (the 924, 928, 944, and 968) never officially materialized. However, the Porsche 924 Turbo Targa prototype suggests otherwise.
The Logical Next Step
Porsche had seen success with Targa versions of the four-cylinder 912 and its successor, the 914, which was designed as a Targa from the outset. Therefore, developing a Targa version of the new 924 entry-level model seemed logical. The development of the 924 Targa began in 1977, with the 911 Targa already in the market since 1966. Simultaneously, the Turbo version of the four-cylinder transaxle model was in its final development phase.
The 924 Turbo Emerges
With the launch of the 1979 model year, the 170 PS, 225 km/h Porsche 924 Turbo closed the performance gap between the base 125 PS 924 and the 180 PS 911 SC. This new model offered a more affordable alternative to the 928, which featured a 240 PS 4.5-litre V8 engine. Porsche emphasized the technological link between the 924 Turbo and its 911 Turbo sibling, underscoring the racing-proven technology used in its turbocharging system.
Engineering the 924 Turbo
Significant changes were made to the 2.0-litre EA 831 engine, transforming it from a naturally aspirated to a turbocharged powerhouse. The 924 Turbo featured a redesigned combustion chamber, a reduced compression ratio, enlarged valves, and relocated platinum spark plugs. These modifications enabled the engine to handle the high temperatures characteristic of turbocharged engines.
The KKK 26 turbocharger, positioned close to the exhaust manifold, played a crucial role, increasing the power output to 170 PS at 5,500 rpm. The car also boasted a maintenance-free transistor ignition, an adapted K-Jetronic injection system, and an increased oil capacity.
A Targa Prototype Is Born
Development of the 924 Targa prototype began on May 1, 1977. The project, designated as 927/57, explored several design concepts, including a coupé with a large glass tailgate and a standalone notchback version. Ultimately, a classic Targa approach with a roll-over bar was chosen. The prototype, based on a 1979 924 Turbo, featured a removable roof section and a design that seamlessly integrated into the car's overall line.
Challenges and Halts
Despite its promising design, the 924 Targa project was halted on February 29, 1980. High development and tooling costs, along with concerns about body rigidity, led to the project's cancellation. The upcoming 944, which later featured a convertible version, also influenced this decision. The knowledge gained from the 924 Targa development contributed to future projects, including the 944 Targa.
Legacy of the 924 Targa
Though the 924 Targa never reached series production, its innovative design and engineering efforts remain a fascinating chapter in Porsche's history. The prototype, housed in the Porsche Museum, stands as a testament to the brand's relentless pursuit of automotive excellence.
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Conclusion
The Porsche 924 Turbo Targa prototype represents an intriguing "what if" in the brand's history. While it never made it to production, its development highlights Porsche's commitment to innovation and performance. If you're inspired by the heritage of Porsche and looking to own one in Dubai, explore the exceptional range of used cars at Auto Trader UAE.
