Fiat was the dominant force in Grand Prix racing in the early 1920’s. The 804 was Fiat’s answer to the new 2 litre formula of 1922 with its all new 6 cylinder 2 litre engine. At the French Grand Prix in July of 1922 a Fiat 804 driven by veteran driver Felice Nazzaro secured an easy win, victory however was marred by the death of his nephew, Biagio in a sister 804. Pietro Bordino would follow the French Grand Prix win with victory at the Italian Grand Prix followed by Nazzaro in second.
Fiat also had success in 1923 with the 805 but with pressure from Mussolini's government to concentrate on other projects and tired of other teams copying their technology and poaching their staff Fiat quit racing in 1924.
Their only other appearance was with the awesome 806 for one race in 1927 winning the Grand Prix of Milan just to show the world they were still the best. After this performance the racing programme was halted and all the racing cars destroyed.