History Car 1980s

Opel Ascona 400

Overview Specs Highlights Characteristics

Overview

Opel developed the Ascona 400 from the second-generation Ascona B two-door saloon to compete in Group 4 rallying. A highly modified front-longitudinal 16-valve four-cylinder and rear-wheel-drive live-axle chassis were developed for consistent international rally pace rather than four-wheel-drive peak traction. British motorsport specialists including Cosworth contributed to the engine head programme, but the final rally engine was not a common standard Opel 2.0-litre road unit.

The exact engine figure deserves careful treatment. FIA Group 4 and Group B historic records list 2,410 cc for the Ascona 400 homologation, while Opel's 2022 factory retrospective describes a 1982 works car with 95 mm bore and 85 mm stroke and calls it 2,420 cc. The geometric capacity from that bore/stroke is approximately 2,410 cc, meaning Opel's prose figures disagree by about 10 cc. We retain both attributed source figures rather than silently converting the 2,420 cc manufacturer label into the FIA value.

Röhrl and co-driver Christian Geistdörfer defeated Audi's Michèle Mouton in the 1982 World Rally Championship drivers' contest through outright wins in Monte Carlo and Ivory Coast and consistent points scoring. Opel did not win the 1982 manufacturers' championship: that went to Audi. FIA homologations also have a crucial chronology: Group 4 form 666 was valid from late 1979, and separate Group B form 221 started in October 1982.

Technical Specs & Innovations

  • Homologated model: Opel Ascona 400, derived from two-door Ascona B
  • Group 4 FIA number: FIA form 666, effective 2 November 1979 in FIA Historic Database, 2,410 cc RWD
  • Group B FIA number: FIA form 221, effective 2 October 1982, retaining 2,410 cc and rear-wheel drive
  • Regulation caution: Its 1982 Monte Carlo victory was Group 4, not a later Group B win
  • FIA displacement: 2,410 cc, per both separate original FIA homologation records
  • Manufacturer 1982 engine claim: Opel's 2022 works-car retrospective says 2,420 cc, although 95 × 85 mm four-cylinder bore/stroke computes to approximately 2,410 cc
  • Bore: 95 mm, from Opel primary technical specification
  • Stroke: 85 mm, from Opel primary technical specification
  • Engine construction: Front-longitudinal naturally aspirated inline-four with competition aluminium crossflow 16-valve cylinder head
  • Cylinder head ancestry: Cosworth-influenced DOHC competition design, developed with Opel engineering
  • Induction: Two Weber twin-body carburettors in Opel's 1982 works-spec description
  • Ignition: Bosch electronic ignition in 1982 Opel manufacturer workscar technical reference
  • Lubrication: Dry-sump oil system on works example
  • Works peak output: Up to 191 kW / 260 hp at 7,000 rpm, Opel factory figure
  • Works peak torque: About 280 Nm at 5,500 rpm, Opel factory figure
  • Gearbox: Getrag five-speed manual competition gearbox
  • Final-drive options: 3.18:1 to 5.3:1 final drive ratios in Opel's works technical description
  • Driven axle: Rear-wheel drive; competition limited-slip rear differential
  • Clutch: Single-plate competition clutch in Opel 1982 reference
  • Body: Steel Ascona B two-door reinforced monocoque with competition cage and guards
  • Length of homologation car: 4,320 mm with bumpers in original FIA Group 4 form
  • Wheelbase of homologation car: 2,518 mm, FIA original Group 4 form
  • Front suspension: Independent double wishbones with coils, anti-roll bar and Bilstein gas dampers in Opel works 1982 reference
  • Rear suspension: Five-link located rigid rear axle with coil springs and Bilstein dampers
  • Brake system: Dual-circuit ventilated discs, driver-adjustable bias and hydraulic handbrake
  • 1982 front disc diameter: 290 mm in Opel works description
  • 1982 rear disc diameter: 278 mm in Opel works description
  • Wheels/tyres: 15-inch Opel light alloys; Michelin tyres sized by surface, widths described from five to ten inches
  • Works car weight: Approximately 1,050 kg without crew as quoted by Opel
  • Works top speed: Up to 225 km/h subject to final-drive gearing, Opel 1982 reference
  • Crew and safety: Recaro seats, six-point harnesses, extinguisher, safety fuel cell, notes/instruments
  • Operational personnel: Rothmans Opel Team under manager Jochen Berger and chief engineer Karl-Heinz Goldstein, with Tony Fall as principal
  • Group B successor: Opel Manta 400 became the later priority rally challenger; Ascona 400 and Manta 400 must remain distinct

🏆 Competitive Highlights

  • 1979 Group 4 homologation: The 2,410 cc Ascona 400 gained FIA homologation 666; works success followed in the early 1980s.
  • 1982 Monte Carlo Rally: Walter Röhrl and Christian Geistdörfer won outright in the rear-wheel-drive Opel Ascona 400.
  • 1982 Swedish Rally: Röhrl finished third in the Opel while Stig Blomqvist's Audi quattro won.
  • 1982 Safari Rally: Röhrl/Geistdörfer finished second behind Nissan's Shekhar Mehta; a key result for season consistency.
  • 1982 Tour de Corse: Röhrl finished fourth on Corsican tarmac, adding championship points without a rally victory.
  • 1982 Rally New Zealand: Röhrl placed second as the championship battle against Audi developed.
  • 1982 Sanremo Rally: Röhrl finished third, maintaining a strong points position.
  • 1982 Rally Côte d'Ivoire: Röhrl/Geistdörfer won outright after an exceptionally attritional event, securing the drivers' championship.
  • 1982 championship split: Röhrl won the drivers' World Rally Championship; Audi won the manufacturers' championship. This was not an Opel manufacturers' crown.
  • Group B eligibility in 1982: Separate FIA Ascona 400 B-221 homologation began in October 1982; don't backdate it to January Monte Carlo.
  • 1982 RAC Rally: Henri Toivonen placed third in an Ascona 400, behind the Audi quattro one-two.
  • Successor context: The Manta 400 became Opel's subsequent Group B focus; its results do not add titles to the Ascona 400.

Driving Characteristics

With rear-wheel drive, a longitudinal naturally aspirated four-cylinder and a long-travel located rear axle, the Ascona responded predictably to precise power application and a disciplined approach to brake placement. The lack of turbo lag helped Röhrl balance the rear axle, but on loose snow and deep gravel the quattro had an inherent four-wheel-drive traction advantage.

Opel's contemporary specification is unusually detailed: Getrag five-speed, dry sump, driver-adjustable brake balance, double-wishbone front geometry and live rear axle. These specific choices—plus extensive maintenance and low retirement rate—explain the season results more faithfully than a vague assertion that the car simply 'handled beautifully'.

The manufacturer's up-to-260-hp figure belongs to its 1982 works car. It must not be assigned to every Group 4 road homologation chassis or modern historic restoration, particularly as FIA and manufacturer descriptions disagree on capacity.

Development & legacy

The 1982 Ascona 400 earned one of the last pre-AWD-era drivers' world titles through Röhrl/Geistdörfer's disciplined programme. It was neither an Audi-style all-wheel-drive car nor a world manufacturers' champion in 1982. Its Group 4-to-Group B legal transition, two outright 1982 wins and technical source discrepancy are central archival details.

Research sources & verification

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