Piquet won the final two races of the season, including a 1–2 finish for Piquet and Moreno at the controversial Japanese Grand Prix. During the season's last race in Adelaide, Australia (the 500th World Championship Grand Prix held since it all began in ), Piquet won after holding off former Williams teammate Nigel Mansell who was racing in a Ferrari. During the race morning warm up in Australia, Piquet's B190 was the fastest car on the 900-metre-long Brabham Straight at (although this was significantly slower than the seen from the turbo powered cars of 1985–1988, the Piquet's fastest race lap time, the second fastest of the race behind only Mansell, was comfortably under the lap record for Adelaide that had been set in 1987 by Gerhard Berger in a Ferrari).