Franco Rocchi's W12 was ready in the first half of the Formula One season. It was the time when turbocharged engines were no longer legal in Formula One and the rules required a normally aspirated motor. New engine manufacturers entered Formula One (such as Ilmor, Judd and Yamaha), and new ideas broke through. Ferrari and Lamborghini used V12 engines (successfully in the former's case), Carlo Chiti's Motori Moderni unsuccessfully tried to revive flat-12 engines, badged as Subarus and used by the Coloni team, whilst Renault and Honda developed V10 engines, used successfully by Williams and McLaren.