 In a spark-ignition engine, a low compression ratio must also be used if the supercharger produces high boost levels, negating some of the efficiency benefit of low displacement.The concept of twincharging was first used by Lancia in 1985 on the Lancia Delta S4 Group B rally car and its street legal counterpart, the Delta S4 Stradale.The idea was also successfully adapted to production road cars by Nissan, in their March Super Turbo.