Documenting A Very Rare Breed

The 1992 Porsche Turbo S Leichtbau

M30/69 SL Engine

A key design goal of the 1992 Turbo S was to increase the engine power over the standard 3.3 ltr turbo (M30/69 – 235 kW/320 bhp) and the X33 increased power option (M30/69S – 261 kW/355 bhp). The M30/69 SL Turbo S engine achieved this goal attaining 280 kW/381 bhp using a combination of different camshafts, precision-machined intake ducts, slightly higher charge pressure and an optimized ignition and fuel injection system. The result was a top speed of 290 km/h (standard – 270 km/h, X33 280 km/h) and 0 – 100 kph at 4.7 seconds.

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1992 Turbo S Leichtbau Specifications

For the base price of 295,000 DM, or approximately $189,000 USD, the M720 option featured a litany of power, weight saving and aesthetic upgrades over the standard 3.3 Turbo. In fact the list of changes is so extensive that it consumes 3 pages of the Porsche Technical Bulletin. From the modified engine to the deleted parts to the lightweight body kit to the upgraded mechanicals, the car is so different from the standard 3.3 turbo as to in some ways be a closer comparison to the Carrera RS and Cup cars (engine induction method aside).

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The 1992 Turbo S Leichtbau

In January 1992 Porsche A.G.’s Rolf Sprenger, head of the VR Department (which oversees the VRS or Exclusive Department), issued a memo to the Porsche Board of Directors regarding the building of a new project car the ‘911 Turbo RS Leichtbau’. The vehicle would be a lightweight street legal Turbo that would be different than standard Turbo units in regards to torque, horsepower, handling, visual aesthetics and market appeal.

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