Porsche’s Weapon from the 70s, the Legendary 934: Porsche 934/5

Chassis 911 660 9057 driven by Dr. Afschin Fatemi at the AvD Oldtimer Grand Prix back in 2019.

By Marcel Hundscheid / Speed-O-Graphica

In our second story looking back at the legendary Porsche 934, we take a closer look at an interesting iteration – the Porsche 934/5.

Porsche aimed to compete in Group 4 of the IMSA championship in 1977 with the 934/5 – a hybrid between the Group 4 Porsche 934 and the more powerful 935 based on the 911 Turbo. The marque used the chassis and engine from a 934 and the wheels, tyre and rear wing configuration of the 935, resulting in the 934/5.

The car was powered by a three-litre single KKK-turbocharged boxer engine equipped with two intercoolers, generating 590 hp. With a curb weight of 1,120 kilograms, the racing version is 75 kilograms lighter than the production car.

With the more powerful 935/77 in play, European racing teams showed a striking lack of interest in the 934/5 and only ten 934/5s were built. And then, before the car could race, it was banned from competition by IMSA.

Brumos Racing owner Peter Gregg was forced to switch from IMSA into the rival SCCA Trans-Am series. The mighty 934/5 won 6 out of 8 races and grabbed the 1977 Trans-Am title. Canadian Ludwig Heimrath finished second in the championship driving a 934. After lodging a formal protest against the winning 934/5, the officials awarded him the championship title.

Chassis 930 670 0645 raced by German Hans-Jörg Hübner at the Spa Classic 2019.