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

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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
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
Fuel tank	85, 110 lt
Drag coefficient	0.38

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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: Citroën Competition

1986Season

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

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Source
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Article ftom 4T 182, 11/1985

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Drawings

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Street version

Engine

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Also used in Peugeot 505 turbo

Transmission

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Rear Torsen type differential not for racing use (top), or rear limited-slip differential (bottom)