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Thursday, January 7, 2021

Singer Transforms a 1990 Aircooled Porsche 911 into a High-Speed Rally Machine


Porsche restoration specialist Singer, known for their work on the 911 1989 to 1994 964 chassis, has come up with this unique effort inspired by the golden era of Porsche rallying in the 1980s. And while it was done at the request of one client, they’re opening it up to others as well.

Prepared in cooperation with rally specialist Richard Tuthill, a dominant name in grueling rally events such as the East African Safari Classic and Dakar Rally, the All-terrain Competition Study or ACS enables this air-cooled 911 to compete in off-road racing. And to highlight the broad capabilities of the ACS, two machines were commissioned—one focused on high-speed desert rallying, and another for high-speed tarmac events.



Things start with a 1990 Type 964 Porsche 911. Singer and Tuthill then strengthened the monocoque for heavy off-road use. The body panels were then switched to carbon fiber for quick replacement and underbody access.

From there, a specialized long-travel suspension with twin, five-way adjustable dampers per corner were installed along with forged 8x16” wheels with BF Goodrich All-Terrain tires, and 4-piston monobloc disc brakes with a hydraulic handbrake.



Giving it more oomph, a 6.0-liter air cooled twin turbocharged flat-6 was installed. Developing 450 horsepower and 569 Nm of torque, the ACS uses a 5-speed sequential gearbox. Power is routed through a permanent all-wheel drive system with front, center, and rear mechanical limited slip differentials.

Built for the likes of the Baja 1,000 and Dakar Rally in mind, it also comes with a long-range fuel tank, two full-sized spare race wheels and tires in the front trunk and rear storage area, full FIA specification roll cage and sport seats, a rehydration system, and a GPS race navigation system. 



As always, each car is approached as a bespoke restoration, and Singer is only able to price them once a client approaches them for their restoration services. 

The ACS restoration has been undertaken as a collaboration between the two companies. Singer’s Design Office in California has led a joint engineering team with assembly undertaken in the UK at the Tuthill facility in Oxfordshire. Future cars will all be modified at Tuthill’s facilities.

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