In 1930 the Duesenberg brothers split their racing operations with Augie naming his business A. S. Duesenberg Racing. The result was a total of eight Duesenberg-built racers entered in the Indianapolis 500 in 1930. The only Duesenberg racer to finish the race that year was driven by Bill Cummings, who took fifth place. Thirteen cars in the 1931 race were based on the Duesenberg Model A. Fred Frame drove Augie Duesenberg's ex-team car to a second-place finish, while Fred Duesenberg's two entries, driven by Jimmy Gleason and Ernie Triplett, finished sixth and seventh, respectively. Augie was also the designer and builder of a Duesenberg chassis for an entry in the 1931 race that was powered by a diesel engine from the Cummins Engine Company. Dave Evans, who became the first person to complete the race without making any pit stops, drove the car to a thirteenth-place finish. Duesenbergs faded from the top of the leaderboard beginning with the 1932 Indianapolis 500, when Duesenberg racers captured seventh-, eighth-, and ninth-place finishess with drivers Ira Hall, Freddy Winnai, and Billy Winn, respectively.