A major mid-season upgrade from McLaren doesn't sound like anything out of the ordinary today. In more humble times three decades ago, it was a big undertaking, yet that's what was required for the team to complete a hat-trick of world championships and Ayrton Senna to claim a second title in the face of a resurgent Ferrari in 1990.
McLaren didn't see reason to change a winning formula for that season. Its first normally aspirated Honda-powered car had won 10 of the 16 races in 1989, and so the MP4/5 morphed into the MP4/5B.
"We didn't consider anything else," says Neil Oatley, who led the design of both cars. "The basic chassis and layout were good, so we effectively fitted a different aero package to what we had."