3.8L Porsche 911S Race Car Listed on Bring a Trailer

A modified 1977 Porsche 911S race car with a 3.8L engine is listed on Bring a Trailer, highlighting custom engineering and track-focused design. Learn more.

A heavily modified 1977 Porsche 911S race car has already reached a $128,500 bid on Bring a Trailer, standing out not as a typical classic but as a radically transformed track-focused machine.

Originally, the 911S of that era was a narrow-body G-series model powered by a 2.7-liter engine, designed primarily as a road-going sports car. In this case, little of that original character remains. The car now features a 3.8-liter flat-six derived from the 964 generation, built with Mahle pistons and cylinders, TWM individual throttle bodies, and controlled by a MoTeC M600 engine management system. Additional components include custom Elgin camshafts and a race-oriented oiling setup.

This configuration shifts the car firmly into track territory. The chassis incorporates an ERP 935-style front suspension system along with Fox Racing shocks featuring remote reservoirs. Brembo brakes are paired with cooling ducts and a brake bias adjuster, while wide Hoosier racing tires underline its focus on grip and performance. Inside, the stripped cabin includes a roll cage, Sparco racing seat, Schroth harnesses, a fire suppression system, and a carbon-fiber dashboard centered around a tachometer — a layout closely tied to Porsche’s motorsport heritage.

What makes this car particularly distinctive is its lack of alignment with any specific racing class. The project was built without regulatory constraints, combining elements from multiple eras: a 1977 chassis, a 964-based engine, and suspension influences from the 935. As a result, it sits outside the traditional categories of factory race cars or typical restomod builds.

This positioning is reflected in the market. Standard late-1970s 911S models are generally valued as accessible classics, whereas builds like this occupy a separate niche where value depends on engineering depth and component quality. The current bid places it near the upper end of the modified 911 market.

At the same time, the car remains highly specialized. It is not road-legal and includes features such as a Fuel Safe racing fuel cell and a modified Type 915 transmission, reinforcing its identity as a dedicated track machine rather than a dual-purpose classic.

Its repeated appearances across auction platforms, with consistent specifications and documented modifications, further distinguish it. The car is not just a one-off creation but a recognized project within the broader custom Porsche landscape.