He test drove the first car built by Auto Avio Costruzione in Modena, where many ex-Lancia colleagues joined him.
Beginning in 1948, Nardi joined with and Renato Danese and established a workshop in Via Vincenzo Lancia, Torino, building racing cars, prototypes, and small-series special designs.
[5] It used a multi-tube chassis and was available as a monoposto (one-seater, or GP type) or due posti (two-seater, sports racer, when fitted with cycle fenders).
[5] For 1947, the Nardi-Danese 1500 Sport was built for Marco Crespi, coupling two 746 cc in series on an Auto Avio Costruzioni 815 chassis.
[7] Around the same time, he traced the original Ferrari straight-eight castings, made in Bologna, and fitted them with 508 heads and an assortment of internal parts, to create a 1½ liter and a 2-liter car.