sentences:  The turbocharged BMW M12 engine now produced around in qualifying trim, de-tuned to for the races, making it the most powerful car ever seen in F1 at the time.This power allowed Piquet to record the fastest speed trap of the 1984 season when he clocked on the 1 km long straight at the old Kyalami circuit during qualifying for Round 2 of the championship in South Africa.Like all other cars in Formula One in 1984, the rear wings featured smaller winglets on each side of the end plates for extra downforce pioneered by Ferrari in 1983.