The Lotus-Honda 100T was not a success and Ducarouge in mid 1989 returned to France. Lotus hired Frank Dernie to replace him. With the new normally aspirated engine regulations in 1989 Lotus lost its Honda turbo engines and moved to Judd V8 engines. In the middle of the year Warr departed and was replaced as team manager by Rupert Manwaring, while long time Lotus senior executive Tony Rudd was brought in as chairman. At 1989, the best result for the team however was 4th places for Piquet in UK, Canada, Japan and 4th place and fastest lap for Nakajima in Australia. At the end of the season Piquet went to Benetton and Nakajima to Tyrrell.