Built to demolish off-road stages, the Singer ACS is a 2021 interpretation of the legendary 911 rally cars that Porsche built in the 1980s. Watch as Tuthill Porsche shows what it can do.

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What is the Singer ACS all about?

The Porsche 911 Reimagined by Singer All-terrain Competition Study (ACS) was undertaken by Singer, in partnership with Richard Tuthill. The idea actually came as a result of a request from a Singer client for a modified air-cooled Porsche 911 that could compete in off-road racing.

The client didn’t just request one, though, no, he requested two. The first of which is featured here in Parallax white, and focuses on high-speed desert rallying. The second is finished in Corsica Red and is built for high-speed, high-grip tarmac stages.

Modifications developed for the Porsche 911 Reimagined by Singer All-terrain Competition Study include:

  • Off-road competition capability, conceived with events such as the Baja 1000 and Dakar Rally in mind, but suitable for a range of surfaces
  • Dramatically increased ride height, suspension travel and overall strength
  • Carbon fibre body panels suited to quick replacement and easy underbody access
  • Permanent AWD
  • A twin-turbocharged, 3.6L, air-cooled flat-six with power starting at 450hp
  • Sequential racing transmission with front, centre and rear limited-slip differentials

Singer ACS: Tech Specs

  • 1990 Type 964 Porsche 911
  • Core strengthening to monocoque for heavy duty off-road use, carbon fiber body panels and off-road race modifications including:

Suspension, wheels and brakes:

  • Specialised long-travel suspension with twin, 5-way adjustable dampers per corner (8 dampers total)
  • Forged aluminium 8×16” wheels with BF Goodrich All-Terrain tyres
  • 4-piston, monobloc steel disc brakes with hydraulic handbrake


  • 3.6L twin turbo-charged, air-cooled, Porsche flat-six
  • Water-to-air intercoolers, with individual-bank charge coolers housed within the plenum and cooled by clamshell-mounted radiator
  • Tuned for the demands of each event, power starts at 450hp and 420lb ft torque


  • 5-speed sequential dog-box enabling flat-shifting. Manual and paddle-shift capable
  • Permanent AWD
  • Front, centre and rear, mechanical, plated limited-slip differentials

Additional Specialised Equipment:

  • Long-range fuel tank
  • 2 x full-size spare race wheels and tyres in front trunk area and rear storage area
  • Full FIA specification roll cage
  • Bespoke competition seats with FIA certification
  • Rehydration system for driver and navigator
  • State-of-the-art GPS race navigation system


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