Patrick Head to realise the team had been too conservative regarding car set up; Boutsen preferred his set-ups to have the anti-roll bars as stiff as possible, to give the car a go-kart feel the Belgian preferred. The 1990 AUTOCOURSE annual published that the Renault V10 produced around 660 BHP at 13,000 RPM, while the class leading Honda V10 used by McLaren produced around 700 BHP at over 13,000 RPM, giving the Williams-Renault a power deficit of around 40 BHP which on power sensitive circuits such as Hockenheim, Spa, Monza and Suzuka would have meant the Williams-Renault combination was giving away at least 0.3 tenths of a second per lap compared to McLaren-Honda on a like for like basis. This partly explains why the FW13 was not a match for the McLarens on fast circuits. The FW13B was replaced for the 1991 season by the successful FW14. Complete Formula One results (key) (results shown in bold indicate pole position; results in italics indicate fastest lap) * 54 points scored in using FW12C References Williams Formula One cars