Ferrari 308 GTB group 4 (1976)
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Home » Rally Cars » Ferrari 308 GTB

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Specifications

2897 units built for GTB
494 units built for GTBi
748 units built for QV
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Group/Class 4 or B/12 Homologation number: 648 and transfer group B, B220, B236, B241 (QV)
Years active 1976-1985 Homologation start: 1/11/1976, 1/10/1982 and 1/1/1983, 1/4/1983
Homologation end: 31/12/1981, 31/12/1987, 31/12/1987, 31/12/1991
Engine
Type Ferrari Dino F106 AB, V8 (90o) cyl, 4 stroke, petrol engine located transverse center, in front of rear axle
Capacity 2927 cc WRC: 2927 cc
Bore x Stroke (mm) 81.0 x 71.0
Compression ratio 10.5:1
Output power - torgue 270 - 290 HP / 8000 rpm 27.2 kgm (267 Nm) / 6000 rpm
with 25 kgm / 4000 rpm
Main bearings forged steel crankshaft with 5 main bearings 63mm diameter connecting rod length between centers 137mm, big end bearing diameter 47.1mm
Materials block: aluminium alloy cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers, 127mm height
Cams/valves 2 x 2 overhead camshafts (DOHC), belt driven 2 valves per cyl - 16 valves total, 42mm inlet valve diameter, 36.8mm exhaust valve diameter. 22.5o angle between inlet valve axis and vertical, 22.5o angle between exhaust valve axis and vertical. 2 coil springs per inlet/exhaust valve
Aspiration naturally, 4 x Weber 40 DCNF57-58-59-60 carburetors
Ignition electronic, firing order 1-5-3-7-4-8-2-6
Cooling system jacketed watercooled with pump, radiator, fan and thermostat
Lubrication system dry sump with 3 stage pump and 2 oil coolers
Transmission
Type rear wheel drive 5 speed manual gearbox with "input" transfer box from engine
Gearbox ratios Transfer box
0.829/1 (30/28 x 24/31) or
0.714/1 (30/28 x 22/33) or
0.770/1 (30/28 x 23/32) or
0.892/1 (30/28 x 25/30) or
0.960/1 (30/28 x 26/29) or
1.033/1 (30/28 x 27/28) or
1.157/1 (30/28 x 27/25) or
1.200/1 (30/28 x 28/25)
1st: 3.077/1 (40/13)
2nd: 2.118/1 (36/17)
3rd: 1.524/1 (32/21)
4th: 1.120/1 (28/25)
5th: 0.828/1 (24/29)
R: 2.923/1 (38/13)
1st: 3.077/1 (40/13)
2nd: 2.118/1 (36/17)
3rd: 1.789/1 (34/19)
4th: 1.409/1 (31/22)
5th: 1.208/1 (29/24)
R: 2.923/1 (38/13)
1st: 3.419/1 (40/13)
2nd: 1.944/1 (35/18)
3rd: 1.409/1 (31/22)
4th: 1.038/1 (27/26)
5th: 0.767/1 (23/30)
R: 2.923/1 (38/13)
cancelled in group B
Diffrential ratio 3.706/1 (63/17)
1983 QV: 3.823/1 (65/17)
helical gears 50-75% limited slip rear differential
Clutch dry, single disk 241mm diameter
Chassis-body
Type steel tubular chassis with roll-cage. 2 door coupe fiberglass bodyshell
Front suspension double unequal wishbones with coil spring, adjustable telescopic gas shock absorber and anti-roll bar 14/15/16/17mm diameter
Rear suspension double unequal wishbones with coil spring, adjustable telescopic gas shock absorber and anti-roll bar 14/18/20mm diameter
Steering system rack and pinion (no servo) 21/1 ratio
Brakes front ventilated disks 272mm diameter with 2 piston calipers 48mm diameter, rear ventilated discs 277mm diameter with 2 piston calipers 38mm diameter.
1977: front ventilated disks 305mm diameter with 4 piston calipers 44.45mm diameter, rear ventilated discs 305mm diameter with 4 piston calipers 38.1mm diameter
dual circuit with vacuum servo
Dimensions
length: 4.230 m (166.5") width: 1.710 m (67.3") height: 1.100 m (43.3")
wheelbase: 2.340 m (92.1") front track: 1460 m (57.5") rear track: 1460 m (57.5")
Rims - tires Front: 8x15" and rear: 12x15" Front: 18/60-15 and rear: 29/61-15 (335/35).
Weight 1050 kg
Fuel tank 74 lt. Group B: 120 lt

Quattrovalvole

Engine
Type Ferrari Dino F106 AB, V8 (90o) cyl, 4 stroke, petrol engine located transverse center, in front of rear axle
Capacity 2927 cc WRC: 2927 cc
Bore x Stroke (mm) 81.0 x 71.0
Compression ratio 10.5:1
Output power - torgue 315 HP @ 8000 rpm
Main bearings forged steel crankshaft with 5 main bearings 63mm diameter connecting rod length between centers 137mm, big end bearing diameter 47.1mm
Materials block: aluminium alloy cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers, 127mm height
Cams/valves 2 x 2 overhead camshafts (DOHC), belt driven 4 valves per cyl - 31 valves total, 29mm inlet valve diameter, 26mm exhaust valve diameter. 22.5o angle between inlet valve axis and vertical, 22.5o angle between exhaust valve axis and vertical. 2 coil springs per inlet/exhaust valve
Aspiration naturally, Bosch K-Jetronic multipoint mechanical fuel injection
Ignition electronic, firing order 1-5-3-7-4-8-2-6
Cooling system jacketed watercooled with pump, radiator, fan and thermostat
Lubrication system wet or dry sump with 2 oil coolers

Results in WSCC

Season
Car entry Car number/ result
Daytona Mugello Silver stone Nurb Watkins Glen Mosport Brands Hatch Hocke nheim Valle lunga
Team 24h 6h 6h 1000km 6h 6h 6h 6h 6h
Felice Besenzoni/ Luciano Dal Ben, 20457 #14, in entry list
Statistics
Works Starts/finishes 0/0

Results in Endurance races

Group GTS-2
Car entry, chassis number Car number, result
Daytona Sebring Le Mans
Date 5/2 18/3 18/6
Duration 24h 12h 24h
Team\ Championship IMSA IMSA
Martino Finotto/ Ruggero Melgrati/ John Finger #80, intake manifold
Statistics
Works Starts/finishes 1/0 1/0

Results in WRC

Races

Season
Entry Rally event
Driver
Codriver
Team MC SVE
Entry list
KEN POR GRE FIN CAN S.R CdI TdC RAC
Raffaele Pinto
Fabio Penariol
20951
Padova Corse distri butor
Statistics
Others starts/finishes 1/0 1/0

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Ferrari-308-GTB-Group-4_9.jpg Source
Ferrari-308-GTB-Michelotto.jpg Source
308gtb-silverstone81.jpg Source
308 GTB Turbo Group 5 at Silverstone '81
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Chassis
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Drawings

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ST27-DC1026.jpg Source
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308-gtb-1980_102.jpg Source

Engine

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Suspension

ferrari308qvfrontsuspen.jpg
Front suspension
ferrari308qvrearsuspens.jpg
Rear suspension

CAD

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