The 911 SC Group 4 Project: Part One

March 15, 2012 in Autohaus Hamilton News

We've wanted to do a project car for a while now, and have been working hard to make sure that it will be something unique, stylish and inspirational.

A couple of years ago I spotted this car on the internet and it struck me straight away as something rare and very special, so I thought it would make an excellent framework for our Autohaus project car.

We are not setting out to build the ultimate interpretation of the air-cooled 911. Rather, we want to build something different, something we love, something we think our customers will like and something that will be based strongly on a theme - in this case the 911 SC Group 4 (SCGrp4) from the late ‘70s and early ‘80s.

Most rally fans still have fond memories of the ‘70s. It was a time when heroes like Walter Röhrl, Sandro Munari, Markku Alén, Bjorn Waldegaard and Per Eklund were flat out at full opposite lock and Lancia Stratos & Porsche 911s were singing their brutal tunes turned up to 11.

The golden years of Group 4's supremacy were spectacular, adventurous and especially diverse. Sports cars like the aforementioned Stratos, Alpines and Porsche 911s compete against saloons like the Ford Escort, Opel Kadett or Fiat 131 until finally the revolutionary Audi Quattro came along and took rallying to the next level with the change to Group B regulations in 1982. Unlike today, a dozen or so manufacturers were fielding machines that could win WRC rallies (Porsche 911 SC Grp 4  -  1st place WRC Tour De Course 1980).

Last year we were lucky enough to have the Porsche factory send Walter Röhrl and the actual 911 SC Group 4 that he drove in the 1982 WRC San Remo out to Australia for Targa Tasmania, so we managed to get a good look at it in the flesh. That was enough to tip us over the edge to find a donor car, buy the body kit and get started.

911SC Group 4 Project Car

Our car is based on a 1987 RHD 3.2 Carrera (chosen for its G50 gearbox). It’s not meant to be a replica in the strictest sense, we’re building something that someone can still happily drive to work a few days a week, take out for a good Sunday run and do half-dozen track days a year in. An out and out race/track car it won’t be.

We want it to be a pleasant, modern place to be, so it will have Aircon that works (we've developed our own kits that do) comfortable leather seats, a modern stereo with Bluetooth and satellite navigation, xenon lights and a clutch pedal that won’t require any extra legs to operate.

The following is a list of the spec we have planned:

Body:


  • Factory RHD 3.2 Carrera completely stripped and repainted in original colour GP White

  • All door frames, brightwork and trim removed, cleaned and re surfaced

  • 911 SC Group 4 wheel arches, front spoiler, ducktail, 935 mirrors

  • Lightweight GRP bumper bars


Interior:

  • RS carpet set without rear seats (fittings will be retained so rear seats can be re installed)

  • Lightweight carbon fiber seats

  • WEVO billet shifter with centre console delete and switches moved to dashboard

  • Engine start button

  • Momo Prototipo steering wheel in Alcantara

  • 964RS style door panels and pulls.

  • Alcantara dash, knee pads, door tops

  • Rennline black anodised floorboards and pedals


Engine:

  • 3.4L piston and barrel set likely to run 10.3:1 compression ratio

  • Remapped Motronic ECU set up to run on 98 RON fuel

  • Custom cams

  • Extrude honed manifold with larger throttle body

  • Lightweight valve spring and retainers

  • Complete rebuild right down to the crank with blueprinted assembly (everything weighed and matched for fine tolerance).


Gearbox will remain standard G50 with a new clutch and WEVO billet shifter as mentioned above.

Suspension:


  • Rebel Racing (RSR) custom-valved Bilstein RSR threaded shocks with coil overs, spring rated and valved to accommodate street and track use

  • 935 style RSR spring plates

  • RSR Monoball rear trailing arm bearings

  • RSR semi-solid front strut mounts

  • Adjustable RSR front and rear sway bars

  • RSR billet front control arm bushing kit

  • RSR Triangulated front strut brace

  • Strengthened rear suspension mounts

  • Turbo tie rod kit


Brakes:

  • Front - Brembo 4 pot caliper running 323mm x 28mm disc / pad set up with stainless steel lines

  • Rear - Brembo 4 pot caliper respective disc / pad set up with stainless steel lines.


Wheels:

  • Penta Motorsport 917 replica 17” custom billet aluminium wheels, likely 8” front and 10” rear


911SC Group 4 Project Car

Last but certainly not least is the colour and general ‘look’. We have started with a factory original Grand Prix White car and intend to keep it that way, with the only addition being some cool graphics and stripes.

We’ve attached some renderings and we'd to get some feedback from you, our fellow Porsche aficionados. The two schemes essentially differ in that one employs the Autohaus racing livery of black/red/silver and the other is a simpler black on white scheme.

Let us know which you prefer in the comments below, or on our Facebook page here. Keeping in mind that some lucky person actually has to drive it around without looking too much like they're lined up on the starting grid.

911SC Group 4 Project Car

So, that’s the spec and the plan. In the mean time enjoy the progress photos and we’ll keep you in the loop with regular updates over the next few months as this beast is brought to fruition and YES! it will be for sale upon completion.