The Lancia team was pinning their hopes on the new Delta S4, which was set to make its introduction late in the 1985 season. The team was not to be disappointed. The S4, one of the most advanced cars ever built, was the only car ever built with a turbo- and supercharged engine, in order to provide maximum boost at all RPM ranges. The complex system, developed in association with Abarth, used a supercharger to provide most of the boost at lower RPM (because a turbo suffers from lag at lower engine speeds), and a turbocharger pressurized the engine at higher RPMs (because a supercharger is less efficient at higher RPMs). The 500+ hp engine took time to perfect, but the results were worth waiting for. Lancia and Abarth managed to successfully synchronize the turbo- and supercharger, so there was a smooth transition from one to the other, and Markku Alen and Henri Toivonen were bestowed with the honour of driving for the Lancia factory during the 1986 season.
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