For the people counting more springs, like me, there are no doubt: 1986. Because the differents alternatives: Lotus-Renault(Senna) x Mclarem-Porsche(Prost) x Williams-Honda(Piquet and Mansell)
A lot of history!
1. Senna won the Spanish GP by 0,14 sec. against Mansell. Fantastic!
2. Prost said, in the first part of the championship: "For now I can´t win many races. We need to develop the car first. But I will colect the maximun possible amount of points. It can be important"
3. The Williams-Honda car was the best one during that year. But Nelson Piquet and Nigel Mansell fight one against other each race.
4. Mansell makes a very, very, beautiful overtake, beating Piquet in Brands Hatch.
5. Rosberg and Alboretto in Monaco. An overtake by the outside part of the track in the Saint-Devote curb!
6. Nelson Piquet x Ayrton Senna in Hungaroring. No coments!
7. Four drivers fighting by the championship until 4 races to the end!
8. Three (Mansell, Prost and Piquet) drivers fighting for the championship in the last Race (Adelaide, Austrália)
9. In this race Mansell needs only a third place. Prost makes a mistake and need to change the tires. Piquet is the leader when Mansell blows up the tires and leaves the race. The title belongs to Nelson? No. The Good Year staff calls all the drivers to change because Mansell´s incident. Except Prost because his tires were changed some laps before. The Professor assumes the first position, wins the race and the championship.