Kammala jumla mai zuwa: Kodayake daidaito na Senna, gasa ta mota, da rashin amincin Williams a farkon kakar ya ba shi damar da ya dace, Senna ya nace cewa Honda ta haɓaka shirin haɓaka injin su kuma ta buƙaci ƙarin ci gaba ga motar kafin ya yi latti. Waɗannan gyare-gyare sun ba shi damar yin turawa a ƙarshen kakar, kuma ya ci ƙarin tsere uku don tabbatar da gasar, wanda aka daidaita a
Japan lokacin da Mansell (wanda yake buƙatar cin nasara), ya tafi a farkon kusurwa yayin da yake gudu na uku kuma ya sa Williams a cikin tarkon dutse. Senna ya gama na biyu, ya ba da nasara ga abokin aikinsa Gerhard Berger a kusurwa ta ƙarshe a matsayin nuna godiya ga goyon bayansa a wannan kakar. Senna yana shirin komawa ƙungiyar Williams don kakar 1992, amma Shugaba na Honda, Nobuhiko Kawamoto, da kansa ya buƙaci ya kasance a McLaren-Honda, wanda Senna ya yi daga aminci; ban da shawarar Alain Prost, Honda ta taka muhimmiyar rawa wajen kawo Senna tare da su zuwa McLaren.