of the time and converted the new car to passive suspension. Walker reported that this was the reason the FW13 had so late in making its race debut as the team worked hard in testing to get the handling of the car right before putting it into competition. 1990 For the 1990 season, the car was updated, becoming the FW13B. It featured revised sidepods and suspension upgrades, as well as Renault's RS2 3.5-litre V10 engine. The FW13B proved fast and reliable, with Patrese and Boutsen winning one race each – Patrese at "home" in San Marino (the San Marino Grand Prix was actually run at the Imola Circuit in Italy), and Boutsen in Hungary after also claiming pole position. In the latter race, Patrese completed an all-Williams front row, drove the fastest race lap and finished fourth, giving the team plenty to celebrate that weekend. However, the team fell to fourth in the Constructors' Championship, behind Ferrari (with whom Alain Prost challenged for the Drivers' Championship) and Benetton (which won the final two races of the season thanks to former Williams driver Nelson Piquet). The general feeling around the F1 paddock was that the FW13B was potentially the fastest car on the grid in 1990 and that the only thing holding it back from consistently challenging McLaren, Ferrari and Benetton more often was Williams not having a true number 1 driver, as both Boutsen and Patrese (particularly Boutsen) were seen as journeymen drivers. After French World Champion Alain Prost had announced he would be leaving McLaren at the end of 1989, he began talks with both Ferrari and Williams about driving for them in 1990. Frank Williams was hopeful of signing Prost (who ultimately chose Ferrari) and many including outspoken World Champion James Hunt felt that had Prost driven the FW13B in 1990 instead of either Boutsen or Patrese then the true potential of the car could have been reached. This need for a true number one driver actually led Frank Williams to bring Nigel Mansell back to the team in to replace Boutsen (who signed with Ligier) despite the fact that the Belgian had given Williams three of its four wins in 1989 and 1990. Upon re-signing, Mansell tested the car and requested softer suspension and different wing settings on the FW13B. The car performed far better in his hands than it had with the regular 1990 drivers, leading