The Ferrari 641 was also the first Formula One car to use an effective traction control system, which debuted at the 1990 Portuguese Grand Prix in Estoril; less than two years before a traction control system debuted on the eventually highly successful Williams FW14B. Ferrari technicians sat down on the Tuesday after the Italian GP on September 11, and developed a rudimentary traction control system, which debuted in Portugal less than two weeks later. The system was relatively simple and straightforward; using just some software and a wheel speed sensor.[4]