Ferrari 308 GTB (Group 4 / B)

Published on: Jan 18, 2016 @ 17:01
Originally Published in: 2014 (old website)
(C) Jay Auger - website owner & author
Notice: Any form of duplication methods (including but not limited to copy/paste of text and screen capture) of the website's content is strictly forbidden.
Ferrari 308 GTB – Group 4

INTRODUCTION

Conceived in 1975 by the well known Italian sports car maker, the Ferrari 308 was evidently not built for rallying in mind, nor was it produced expressly for homologation purposes. However, some privateers thought that the car would perform well in tarmac rallies around Europe.


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HISTORY

Ferrari went on with Group 4 homologation in 1976 to satisfy its customers. This then sparked the idea to have purpose-built 308 rally cars. Ferrari didn’t want to get directly involved due to its prior commitments in Formula One so they referred these customers to partner Michelotto instead. The well-known race engineering firm would devise a Group 4 rally package which was implemented in 11 customer cars.

It is notable to mention that, besides its transfer from Group 4, the 308 GTB was homologated three times into Group B; October of 1982, January of 1983, and again in April of 1983. This was done expressly to homologate different components such a bodywork panels in different material compositions and optional performance parts, plus variations on its engine.

In 1983, this allowed Michelotto to mildly update the rally package with polycarbonate screens and other performance options to take advantage of the looser Group B regulations. The firm would build 4 customer cars under the new specifications. Sadly, the Group B cars turned out to be somewhat unreliable in comparison to their Group 4 brethren.

Similarly to the BMW M1, the 308 GTB was very expensive to race and maintain, appearing in only three World Rally Championship (WRC) events when the national and international calendars overlapped. The best result of the car being a 2nd place finish at the 1982 Rallye Monte Carlo at the capable hands of Jean-Claude Andruet.

The Ferrari 308 GTB was ultimately never used as a factory “works” entry but the Maranello company witnessed the privateer cars perform rather well on European and Italian Rally Championship tarmac rallies.

Enticed by this success, Ferrari would later design and produce the incredibly potent 288 GTO (based on the 308 and GT/M) and its Evoluzione variant which was specifically intended for Group B homologation and circuit racing.

***This article is only a quick excerpt / please come back later for page expansion***


RALLY CAR SPECIFICATIONS

Group/Class
  • 4
  • B/12
Homologations:

  • # 648 (Group 4)
  • # B-220 (Group B)
  • B-236 (Group B)
  • # B-241 (Group B)
  • click # to view papers
Years active 1976~86 Homologation start:

  • November 1st 1976 (Group 4)
  • October 1st 1982 (Group B)
  • January 1st 1983 (Group B)

Homologation end:

  • December 31st 1987 (Group B)
Engine
Type Tipo F106A, V8, DOHC 32v, gas located middle transverse, 90 degree V8
Displacement 2927 cc WRC = 2927 cc
Compression ratio N/A
Output power – torque
  • 310 HP @ 8000 rpm
  • (400 HP reported possible)
– lb-ft (- Nm) @ – rpm
Materials block: light alloy cylinder head: light alloy
Aspiration
  • Normal / Natural
  • Bosch K-Jetronic Fuel Injection
Ignition N/A
Cooling system water-cooled
Lubrication system dry sump dual oil coolers
Transmission
Type rear wheel drive 5 speed manual gearbox
Gearbox ratios N/A N/A
Differential ratios N/A ZF type 50~80% limited slip rear differential
Clutch hydraulic
Chassis-body
Type steel tubular spaceframe with roll cage, lightweight fiberglass bodyshell
Front suspension double wishbones, coil springs, anti-roll bar
Rear suspension double wishbones, coil springs, anti-roll bar
Steering system rack and pinion N/A
Brakes AP 4-pot calipers, 305 mm vented discs both front and rear. dual circuit with servo, pedalbox with adjustable brake-bias
Dimensions
length: 4230 mm (166.5 in) width: 1820 mm (71.7 in) height: 1120 mm (44.1 in)
wheelbase: 2340 mm (92.1 in) front track: 1500 mm (59.0 in) rear track: 1500 mm (59.0 in)
Rims – tires
  • Front: 8×15″
  • Rear: 12×15″
  • Front: 18/60-15
  • Rear: 29/61-15 (335/35)
Dry/Unladen Weight 980~1030 kg (2160~2270 lb)
Weight/power 3.2 kg/HP (7.0 lb/HP)
Fuel tank N/A

HOMOLOGATION / PRODUCTION VERSION

ferrari308

Styled by renowned design firm Pininfarina, the 308 came in many versions and specifications over its 11 year production run from 1975 to 1985. In fact, it was homologated no less than four times (once in Group 4, thrice in Group B) to allow customers to compete with the various spec’d cars.

The 308, along with the GT/M prototype, was the main technical basis for the incredible 288 GTO Group B homologation supercar, which was sadly never raced.

Ferrari 308 – technical view

ROAD CAR SPECIFICATIONS

The following specifications are for highest spec’d of the 308 GTB: the European Quattrovalvole (QV) version.

Class Grand Touring Homologations:

  • # 648 (Group 4)
  • # B-220 (Group B)
  • B-236 (Group B)
  • # B-241 (Group B)
  • click # to view papers
Production 1975~85 (12,004 units) Assembly: Maranello, Italy
Engine
Type F105AB, V8, DOHC 32v, gas located middle transverse, 90 degree V8
Displacement 2927 cc
Compression ratio 8.8:1
Output power – torque 245 HP @ 7000 rpm 180 lb-ft (243 Nm) @ 4600 rpm
Materials block: light alloy cylinder head: light alloy
Aspiration
  • Normal / Natural
  • Bosch K-Jetronic Fuel Injection
Ignition Marelli MED 803A Digiplex electronic ignition system
Cooling system water-cooled
Lubrication system wet sump N/A
Transmission
Type rear wheel drive 5 speed manual gearbox
Gearbox ratios N/A N/A
Differential ratios N/A limited slip rear differential
Clutch hydraulic
Chassis-body
Type steel tubular spaceframe, steel bodyshell
Front suspension double wishbones, coil springs, anti-roll bar
Rear suspension double wishbones, coil springs, anti-roll bar
Steering system rack and pinion N/A
Brakes ventilated discs, all-round
Dimensions
length: 4230 mm (166.5 in) width: 1720 mm (67.7 in) height: 1120 mm (44.1 in)
wheelbase: 2340 mm (92.1 in) front track: 1460 mm (57.5 in) rear track: 1460 mm (57.5 in)
Rims – tires
Curb Weight 1286 kg (2835 lb)
Weight/power 5.2 kg/HP (11.6 lb/HP)
Fuel tank N/A

VIDEOS


REFERENCES

 Affiliates Program – (free delivery worldwide!)

 Ferrari 308, 328 & 348: The Complete Story

Group 4 Group 4 – From Stratos to quattro (English)

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(C) Articles by Jay Auger – website owner & author

  • Images & videos are the property of their original owners
  • All homologation papers are the property of the Fédération Internationale de l’Automobile (FIA): SOURCE
  • Eifel Rallye Festival pictures used under permission – McKlein Publishing
  • DISCLAIMER / LEGAL NOTICES
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