Piquet Jr. says he's moving to NASCAR

MADRID -- Former Renault Formula One driver Nelson Piquet Jr. said Tuesday he is moving to NASCAR.

Piquet Jr. said that after his "first 18 months in F1 did not go as planned I have decided to focus on something different and have chosen to take a route in America."

NASCAR will be the "ultimate challenge," Piquet Jr. said. He did not reveal which team he would race for but says more details will come soon.

Piquet Jr. hasn't raced since being fired by Renault in August after a 28-race career where his best finish was second at the 2008 German GP.

The Brazilian driver is best remembered for deliberately crashing his car at the 2008 Singapore Grand Prix on team orders to help teammate Fernando Alonso win the race.