Nadeau drove alongside sports car driver Gene Felton for the Jill Prewitt team which entered the 1992 12 Hours of Sebring, but retired after forty-eight laps because of a differential problem. He also took part in karting events in St. Petersburg, Russia, competing on an ice track, winning two out of eight races. Nadeau later stated the experience helped him to develop the skill of not using his car's brakes on slippery surfaces. In 1993, he raced in the Barber Pro Series, where he finished with one win and took fifth in the points standings. Nadeau also drove in the European Formula Ford Festival winning the qualifying race and coming second in the semi-finals behind Formula Ford champion Peter Duke. Nadeau secured fourth in the final heat. He also took five, top-four finishes in the Firestone Firehawk Series. Nadeau improved in the Barber Pro Series in 1994 by finishing fifth in the championship with two victories. In 1995, he took two victories but fell to thirteenth overall in the standings.