Senna won the first four races of the season, in the
United States,
Brazil,
San Marino and
Monaco, before
Williams and
Nigel Mansell found their feet with the FW14, which dominated in mid-season. Consistent podium finishes on Senna's part throughout the year helped McLaren, but Senna insisted that Honda step up their engine development programme and demanded further improvements to the car before it was too late. Honda responded with updated versions of the V12 engine, while Oatley redesigned various features of the car, particularly the sidepods and wings. Senna won in
Hungary and
Belgium before clinching his third and final Drivers' Championship in
Japan with second place behind Berger; he then won the final race in
Australia to secure the team's fourth consecutive Constructors' Championship. McLaren continued with the MP4/6, upgraded to 'B' specification, for the first two races of , Senna finishing third in
South Africa. The MP4/6B was then replaced with the car designed for the 1992 season, the
MP4/7A which had a semi-automatic transmission and traction control, though three MP4/6Bs were brought to the 1992 Brazilian Grand Prix as spares. The MP4/6 was considered by some to be the most competitive car in the Formula One field until Williams sorted the FW14, which was aerodynamically and technically more advanced. In all, the MP4/6 took eight Grand Prix wins and ten pole positions and scored 148 points. The car brought a close to McLaren's and Honda's domination of the sport, stretching back to the mid-1980s. File:Ayrton Senna McLaren MP4-6 1991 United States.jpg|Ayrton Senna won the
1991 United States Grand Prix with the MP4/6. File:Honda RA121E engine Honda Collection Hall.jpg|The
Honda RA121E
V12 engine. == In popular culture ==