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The First Twin-Charged Car

Lancia Delta S4 "Stradale"

The Lancia Delta S4 “Stradale” was produced from 1985-1986. Lancia is an Italian automaker that was required to produce a street version of the Delta S4 for it to compete in the World Rally Championship Group B. There were a total of 200 units of the street version built.

The Lancia Delta S4 was the first car to use the twin-charger technology. The 1.8-liter engine is equipped with a turbocharger and a supercharger. During this time many turbo vehicles faced “turbo lag” in the low RPM range. The belt driven supercharger was in place to help eliminate the low-end turbo lag.

The car produced around 250 horsepower which was plenty to run 0-60 mph in just six seconds. The Lancia Delta S4 featured a space frame with steel tubes, lightweight body components, a four-wheel drive system, 5-speed manual transmission, and two inter-coolers etc. The manufacturer claimed that the car can top out at 140 mph.

1985-1986 Lancia Delta S4 interior.

The racing version of the car was tuned more aggressively with over 480hp. The manufacturer was able to get to 1000hp on the same engine for demonstration purposes.  The Group B series of the WRC was disbanded in 1986 along with the Delta S4.

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