Citroen BX 4TC group B (1986)
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Chassis numbers (EVO)

On board: special stage in Swedish rally 1986 with Andrue: see video
Technical details: see video


Specifications

Registration numbers
Group/Class B/12 Homologation number: B279
Years active 1986 Homologation start: 1/1/1986
Homologation end: 31/12/1990
Engine
Type Simca type 180 N9TE, straight 4 cyl, 4 stroke, petrol engine located front longitudinal with 15o inclination to co-driver side (LHD)
Capacity 2141.5 cc WRC: x 1.4 = 2998 cc
1988: x 1.7 = 3640.5 cc
Bore x Stroke (mm) 91.4 x 81.6
Compression ratio 7.0:1
Output power - torgue 380 HP / 7000 rpm 46.9 kgm (460Nm) / 5500 rpm
Main bearings forged steel crankshaft with 5 main bearings 57mm diameter connecting rod length between centers 137mm, big end bearing tunnel diameter 55.9mm
Materials block: cast iron cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers
Cams/valves 2 overhead camshafts (DOHC), chain driven 2 valves/cyl. - 8 valves total.43mm inlet valve diameter, 38mm exhaust valve diameter.
EVO: 46.2mm inlet valve diameter, 41.2mm exhaust valve diameter. 53o angle between inlet valve axis and exhaust valve axis
Aspiration Garrett T3 (11 blades nickel alloy turbine 16/58.3mm in/out diameter, 12 blades aluminium compressor 15/60mm in/out diameter) turbocharger, EVO: KKK K26 turbocharger (12 blades nickel alloy turbine 54.5/64.4mm in/out diameter, 12 blades aluminium compressor 50.9/76mm in/out diameter) with air/air intercooler, Bosch multipoint electronic fuel injection. EVO: Bosch K-jetronic mechanical multi point fuel injection pressure: 1.25 bar
Ignition electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, fan and thermostat 9.5 lt
Lubrication system dry sump with oil cooler located below rear airofoil lt
Transmission
Type four wheel drive citroen SM-C35 5 speed gearbox
Gearbox ratios constant: 1.000/1 (24/24),
1st: 2.923/1 (38/13)
2nd: 1.941/1 (33/17)
3rd: 1.321/1 (37/18)
4th: 0.969/1 (32/33)
5th: 0.756/1 (28/37)
R: 3.153/1 (41/13)
constant: 1.000/1 (24/24),
1st: 2.500/1 (35/14)
2nd: 1.777/1 (32/18)
3rd: 1.381/1 (29/21)
4th: 1.130/1 (26/23)
5th: 0.96/1 (24/25)
R: 3.153/1 (41/13)
constant: 1.000/1 (24/24),
1st: 3.307/1 (43/13)
2nd: 2.250/1 (36/16)
3rd: 1.631/1 (31/19)
4th: 1.227/1 (27/22)
5th: 0.96/1 (24/25)
R: 3.153/1 (41/13)
Diffrential ratio front/rear 3.889/1 (35/9), 4.375/1 (35/8), 4.857/1 (34/7), 4.875/1 (39/8) spiral bevel gears 30% limited slip front differential. Hypoid spiral bevel gears 30% limited slip rear differential. Lock mechanism to rear differential engagement
Clutch dry, double plate disks
Chassis-body
Type steel monocoque chassis with roll cage. 5 door saloon steel/fiber bodyshell with fiber panels, bumpers, doors, bonnets and rear airofoil
Front suspension double unequal wishbones with 1 lower 'A' wishbone and 1 upper short transverse arm, hydropneumatic system, and anti roll bar
Rear suspension double unequal wishbones with 1 lower 'A' wishbone and 1 upper short transverse arm, hydropneumatic system, and anti roll bar
Steering system rack and pinion with hydraulic power assistance 2.5 turns lock to lock. 14.48/1, 11.16/1 ratio
Brakes front and rear ventilated disks 260mm diameter with 4 aluminium piston calipers 42mm diameter dual circuit with Citroen hydraulic servo
Dimensions
length: 4.512 m (177.6")
EVO: 4.590 m (180.7")
width: 1.830 m (72")
EVO: 1.915 m (75.4")
height: 1.380 m (54.3")
wheelbase: 2.612 m (102.8") front track: 1.550 m (61.0") rear track: 1.550 m (61.0")
Rims - tires 150 TR 380FH 210/55x15 VR 390
Weight 1150 kg
Weight/power 3.0 kg/HP
Fuel tank 85 - 110 lt
Drag coefficient 0.38

Results in WRC

Statistics

1986 Total
Total works WRC results
Races /wins 3 3
Entries/finishes 7/1 7/1 (14.3%)
Total points 14 5
(1.667 per race) )
(0.715 per entry)

Races

Works team: Citro├źn Competition

Season
Entry Rally event
Driver
Codriver
Team MC SVE
Entry list
POR KEN TdC GRE NZ ARG FIN (CdI) SR RAC (Oly)
Jean-Claude Andruet
Annick Peuvergne
works acci dent 6th acci dent
Philippe Wambergue
Jean-Bernard Vieu
VF7XBXL0000XL0017
works suspe nsion engine
Philippe Wambergue
Jean-Bernard Vieu
VF7XBXL0000XL0015
works suspe nsion
Maurice Chomat
Didier Breton
works suspe nsion
Total points
()
5 5
Statistics
Works starts/finishes 7/1 2/0 2/1 3/0

bx_6max.jpg Source
bx_3max.jpg Source
bx_4tcevo_rear.jpg Source
_Citroen_BX_4TC498188fc9fef5.jpg Source

Article ftom 4T 182, 11/1985

Click here
BX-4TC-1.jpg Source
citroenbx_engine.jpg Source

Drawings

unknowncitroenbx4tcwrc1.jpg Source
bx_4tc_transparant.jpg
Street version

Engine

N9TEcutaway.jpg Source
Also used in Peugeot 505 turbo

Transmission

citroen-bx-4x4_xxxx.jpg Source
Rear Torsen type differential not for racing use (top), or rear limited-slip differential (bottom)
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