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Motorsport genes for the road · 1974-1987

Porsche 911 G-Series Homologation Models Buyer's Guide

Carrera RS 3.0, Carrera SC/RS and Carrera CS: variants, identification, originality, typical weak points, documents, market prices and a buying check for the most exclusive icons of the G-Series.

The models at a glance Technical analysis Cost overview Market prices Expert advice
Approval for motorsport

Investments with motorsport DNA

The Porsche 911 has always stood for the perfect symbiosis of everyday usability and motorsport performance. But there are special models that carry the motorsport idea further still: the sporting Homologation models. These cars were developed primarily to gain approval for motorsport while remaining usable on the road.

In this buyer's guide we look at three of the most exclusive icons: the radical Carrera RS 3.0 (1974), the extremely rare rally car Carrera SC/RS (1984) and the purist lightweight version Carrera CS (1987). As genuine investments with steadily growing value, these cars call for a well-founded basis for a decision.

55

RS 3.0 road cars

21

Carrera SC/RS worldwide

340

Carrera CS built

900 kg

Lightweight construction of the RS 3.0

The models at a glance

Exclusive motorsport icons

Carrera RS 3.0 (1974)

55 road cars

  • Radical lightweight construction (around 900 kg)
  • A 3.0-litre flat six with 230 PS
  • Brakes from the Porsche 917
  • Ducktail and front spoiler lip

Carrera SC/RS (1984)

21 cars worldwide

  • A Group B rally car
  • The 3.0-litre engine modified to 255 PS
  • The Turbo wide body in aluminium
  • An uprated 915/71 gearbox

Carrera CS (1987)

340 built

  • A weight reduction of around 70 kg
  • Hollow inlet valves and 6,840 rpm
  • A G50 gearbox with a short shift
  • Comfort consistently done without
Technical analysis

Weak points and particularities

Click the sections to read the full information.

1. Body and exterior: lightweight construction +

Carrera RS 3.0 (1974): Thin panels with material milled away where it was not needed. Engine lid and front lid in fibreglass. Underbody protection left off to save weight.

  • Risk: Highly prone to corrosion. The fibreglass can tear out at the fixing points

Carrera SC/RS (1984): The Turbo wide body, with aluminium for the lids, doors and wings. Fibreglass bumpers and spoilers.

  • Risk: Galvanic corrosion where aluminium meets steel. Check for signs of rally repairs

Carrera CS (Club Sport, 1987): The standard body, but without fog lights and insulation. Reduced underbody protection increases the risk of corrosion at the sills.

2. Engines and transmissions: the sporting specification +

Drivetrain:

  • RS 3.0 and SC/RS: The Bosch-Kugelfischer injection pump. Servicing and setting it up calls for highly specialised experts
  • SC/RS: High compression with forged pistons. A sintered metal clutch with an extremely heavy pedal
  • Club Sport: The marking "81" on the crankcase. A modified EPROM for the higher rev limit
3. Suspension and brakes: motorsport precision +
  • RS 3.0: RSR pick-up points at the rear for adjustable camber. Brakes from the 917 with adjustable balance
  • SC/RS: Rally suspension with additional struts and ride height adjustment through adjustable mounting points
  • Club Sport: Green Bilstein dampers and thicker anti-roll bars on late cars
4. Interior: purism +

Consistent reduction: no rear seats, pull straps instead of handles (RS 3.0 / SC/RS), a spartan specification.

  • Club Sport: The absence of air conditioning, central locking and a glovebox lid are marks of originality
The homologation models model bible

The complete knowledge: the Investor Dossier & Technical Compendium, in German

Concentrated expert knowledge on the RS 3.0, SC/RS and Carrera CS: detailed weak points, inspection checklists, production numbers, marks of originality and price forecasts.

€97

incl. VAT

To the compendium (German)
Estimates for 2026

Cost overview

Calculations based on specialist workshops.

Porsche 911 Carrera RS 3.0 (1974)

Repair / servicingApprox. cost
Engine rebuild, complete€30,000 - €40,000
Kugelfischer pump overhaul€3,500 - €5,000
917 brake system overhaul€4,000 - €6,000
Restoration of the lightweight partsfrom €8,000
Body restoration, complete€80,000 - €120,000

Carrera SC/RS (1984)

Repair / servicingApprox. cost
Engine rebuild, complete€25,000 - €35,000
Kugelfischer overhaul€3,500 - €5,000
Fibreglass body parts€5,000 - €10,000
Aluminium components€6,000 - €12,000
Rally suspension parts€5,000 - €8,000

Carrera CS (1987)

Repair / servicingApprox. cost
Engine rebuild, complete€20,000 - €30,000
G50 gearbox overhaul€5,000 - €7,000
Bilstein damper overhaul€2,000 - €3,500
CS interior parts€3,000 - €6,000
Repaint in the original colour€12,000 - €20,000
Price development, as at May 2025

Market prices and collector value

ModelCondition / variantPrice
Carrera RS 3.0Condition grade 2€1,800,000 - €2,400,000
Carrera RS 3.0Concours€2,400,000 - €3,000,000+
Carrera SC/RSRoadworthy€900,000 - €1,300,000
Carrera SC/RSA works car€1,800,000 - €2,500,000+
Carrera Club SportCondition grade 2€220,000 - €280,000
Carrera Club SportConcours€280,000 - €350,000+

Expert advice from 911Finder

Homologation models are more than cars: they are physical stores of value. The RS 3.0 and the SC/RS offer the greatest exclusivity. The Club Sport is the most accessible option for committed drivers who are focused on performance.

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