RX Lancia Delta S4 – Bruno Saby

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LANCIA DELTA S4 RX (Bruno Saby)

Before Group B was cancelled, Bruno Saby managed to get much rallying experience with the top Peugeot Talbot Sport WRC team, winning the 1986 Tour de Corse. Afterwards, among other series, he participated in the 1988 French Rallycross Championship driving a Lancia Delta S4.

Albeit it was a very costly car, the Delta S4 was one of the most coveted for rallycross since it combined both supercharging and turbocharging (resulting in very little lag and more power down in the low rpm range). However, the car was reportedly very twitchy and difficult to drive on bumpy terrain. As such, many Delta S4 rallycross privateers tried adding lots of aerodynamic aids to the car. Albeit Saby’s S4 was officially rated at 450 HP, other teams reportedly used up to 600 HP, and in the later rallycross horsepower wars it was rumored that some S4s had over 800 HP. It is one of the rarer Group B cars to participate in the European Rallycross Championship.

SPECIFICATIONS

Group/Class Formula A – Division 2 Championships: none
Years active 1988 Best finish: 2nd (1988)
Engine
Type Abarth 233 ATR 18S, I-4, DOHC 16v, gas located middle longitudinal
Capacity 1759 cc
Compression ratio 7.1:1
Output power – torque 450 HP @ 8,000 rpm 289 lb-ft @ 5,000 rpm
Materials block: aluminium alloy cylinder head: aluminium alloy
Aspiration
  • KKK K27 turbocharger combined with Abarth Volumex Supercharger with 2 intercoolers
  • IAW Weber-Magneti Marelli multipoint electronic fuel injection
boost: 32 psi (2.2 bar)
Ignition Weber-Magneti Marelli electronic
Cooling system water-cooled
Lubrication system dry sump
Transmission
Type four wheel drive 5 speed ZF gearbox
Gearbox ratios 1st: 2.500
2nd: 1.579
3rd: 1.115
4th: 0.862
5th: 0.710
R: 2.462
Differential ratio
  • 2.263
  • helical gears Ferguson viscous coupling epicyclic center differential with F35/R65% ratio and 2 outputs shafts
  • 1st to spiral bevel gear limited slip front differential and 2nd to spiral bevel gear limited slip rear differential
Clutch dry – double disc
Chassis-body
Type composite riveted body panels on tubular Chrome-Molybdenum steel spaceframe, underbody lips, large supplemental rear spoiler
Front suspension double unequal wishbones, coil spring, telescopic hydraulic shock absorbers, anti-roll bar
Rear suspension double unequal wishbones, coil spring, twin telescopic hydraulic shock absorbers, anti-roll bar
Steering system pneumatic power assisted rack and pinion 2.5 turns lock to lock
Brakes front and rear ventilated rotors 300mm diameter, 4 piston calipers all around dual circuit with servo, adjustable ratio split front to rear (unassisted)
Dimensions
length: 3990 mm (157.1 in) width: 1880 mm (74.0 in) height: 1360 mm (53.5 in)
wheelbase: 2440 mm (96.1 in) front track: 1510 mm (59.4 in) rear track: 1535 mm (60.4 in)
Rims – tires 8″~10″ x 16″
  • front: 235/660 – 16
  • rear: 290/660 – 16
Dry/Unladen Weight 980 kg (2160 lb) bias % F45/R55
Weight/power 2.2 kg/HP (4.8 lb/HP )
Fuel tank 25 liters

PICTURES & VIDEOS

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Article by Jay Auger

Website owner & author


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