while at that stage Boutsen could only boast his 2nd place at Imola in 1985. saw Boutsen with a new teammate, the Italian Alessandro Nannini. When Cosworth stopped development of their turbocharged V6 engine, Benetton were forced to switch to normally aspirated Ford DFR V8 engines in anticipation of the banning of turbos in 1989. Boutsen's consistency, mechanical sympathy and speed in the Rory Byrne designed Benetton B188 saw him score points in 10 of the 16 races, including five 3rd-place finishes (all behind the all-conquering McLaren-Honda cars), and place 4th overall as the best non-turbo driver in the field. Williams Frank Williams signed Boutsen in the summer of 1988 to replace Nigel Mansell for 1989 as Mansell had signed to move to Ferrari. Boutsen's reputation as a reliable, fast driver with good development skills saw Williams sign him on a two-year contract. For 1989, he drove the new V10 Renault powered Williams FW12C. began with Boutsen on the back foot due to a heavy pre-season testing crash in Rio and because veteran teammate Riccardo Patrese had a major resurgence in form. However at the Canadian Grand Prix, Boutsen drove well in wet conditions and took his maiden victory after Senna suffered a late engine failure. Although it was a welcome win (Boutsen became the first new winner in F1 since former Arrows teammate Gerhard Berger had won the 1986 Mexican Grand Prix for Benetton), it was considered a lucky win for the Belgian as he had been last at one stage and had a full 360° spin, though luckily he managed to keep his car off the walls. He managed to catch and pass Patrese who was suffering with a loose undertray and took the lead 3 laps from the end when the Honda V10 engine in Senna's McLaren MP4/5 seized. Three more podium finishes came before Boutsen rounded the year off with a second victory at the rain-soaked Australian Grand Prix. Ironically Boutsen had been one of the drivers protesting about the conditions at the circuit before the race. saw more consistent points scoring drives, including his third and final Grand Prix victory - a lights-to-flag victory in Hungary where he took his first pole position and held off sustained pressure from Alessandro Nannini (Benetton) and Ayrton Senna (McLaren) to win. However, with Nigel Mansell available in 1991, Williams felt they needed a 'star' driver to put together