Riviera MotorSports is proud to present the fully restored Ruoteclassiche - Best in Classic 2022" award Lancia Delta S4 Stradale. The image posted in the advert is for representation purpose only. Images and supporting documents will be provided upon serious request.
The Lancia Delta S4 is a Group B rally car manufactured by the Italian car company Lancia. The Delta S4 competed in the World Rally Championship in 1985 and 1986, until Group B class was disbanded and the cars were eventually banned from competition completely by European sanctioning body FIA. The car replaced, and was an evolution of the 037. The S4 took full advantage of the Group B regulations, and featured a midship-mounted engine and all-wheel drive for superior traction on loose surfaces. The car's 1,759 cc (1.8 L) Inline-four engine combined supercharging and turbocharging to reduce turbo lag at low engine speeds (rpm). The engine generated a maximum output of 490 PS (360 kW; 483 hp) but some sources even claim that the engine was capable of generating 507 PS (373 kW; 500 hp). In 1985, when Lancia engineers tested an S4 engine under extreme conditions, it developed around 1,014 PS (746 kW; 1,000 hp) at 5 bars of boost pressure. An engine capacity multiple of 1.4 was applied to forced induction engines by the FIA and the choice of 1,759 cc (1.8 L) put the S4 in the under 2,500 cc class, which allowed for a minimum weight of 890 kg (1,962 lb). The combined super/turbocharger system (often referred to as twin charging) was a development of the 037 engine that generated 325 hp (242 kW) with a supercharger only.
Between October 1985 and 1986 Lancia, in keeping with Group B racing regulations, was to have built 200 of a road-going version of the Delta S4, officially named Lancia Delta S4 but widely known as "Stradale", for the purpose of homologation in Group B, but it is more likely that fewer than 100 were actually built. In Italy, the car was priced at about 100 million Lira:[7] five times the price of the most expensive Delta of the time, the HF Turbo.

The Stradale's chassis was a space frame, similar to its rally counterpart, built out of CrMo steel tubes and aluminum alloy for the crash structures; it was covered by epoxy and fiberglass body panels. Like the rally car, the 1.8-litre four-cylinder engine was longitudinally mid-mounted, equipped with Weber-Marelli IAW integrated electronic ignition and fuel injection, a supercharger, a turbocharger and two intercoolers. In road tune the 1.8 produced 250 PS (184 kW; 247 hp)[8] at 6750 rpm and 291 N⋅m (215 lb⋅ft) of torque at 4500 rpm. The "Stradale" kept a three differential four-wheel-drive system from the rally car; the centre differential sent 30% of the engine torque to the front open differential, and 70% to the rear limited slip. The transmission remained a 5-speed but was a fully-synchronized unit built by CIMA.
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