In late 1988 Chiti was commissioned by Subaru to design a new 12-cylinder boxer engine, known as the 1235 for the new 3.5-litre normally aspirated F1 regulations.
A finais de 1988 Subaru encargou a Chiti o deseño dun novo motor boxer de 12 cilindros, coñecido como o 1235 un 3´5 litros de aspiración atmosférica para a F1.