Petit made his single-seater debut in 2011, racing in the
FFSA Academy-centrally run
French F4 Championship. Following one-off appearances in the
Formula Renault 2.0 Alps Series and Peugeot RCZ Racing Cup France in the next two years, Petit spent the following two seasons in the V de V Challenge Endurance for Mornay Motorsport and
Graff, respectively. Remaining with
Graff for 2016, Petit made his debut in the LMP3 class of the
European Le Mans Series alongside
Enzo Guibbert and Eric Trouillet. In his rookie season, Petit scored wins at
Le Castellet and
Spa to end the season runner-up in points after scoring two more podiums. Stepping up to LMP2 competition for 2017, Petit remained with
Graff for his sophomore season in the
European Le Mans Series. In his maiden season in the category, Petit finished third at the
Red Bull Ring and
Le Castellet to finish seventh in points at season's end. Remaining in the LMP2 class of the
European Le Mans Series for 2018, Petit switched to
Racing Engineering for his third season in the series. In his only season with the team, Petit won at
Le Castellet and finished second at the
Red Bull Ring to secure third in the standings. The following year, Petit made his debut in GT3 competition by joining
Team WRT to race in the
Blancpain GT Series Endurance Cup alongside
Shae Davies and
Alex MacDowall. Racing in all but two races, Petit scored a best result of sixth and finished the year 16th in the Silver Cup standings. Petit then transitioned to the
French GT4 Cup for 2020, joining
AKKA ASP Team alongside
Thomas Drouet. In his first season in the series, Petit scored Silver Cup wins at
Le Castellet and took five more podiums to end the year third in the standings. In 2021, Petit joined
Toksport WRT to race in the Silver Cup of the
GT World Challenge Europe Endurance Cup alongside
Marvin Dienst and
Óscar Tunjo. In his sophomore season in the series, Petit scored class podiums at the
24 Hours of Spa and
Nürburgring, and ending the year 13th in points despite missing the finale at
Barcelona due to a knee injury. Returning to the French GT4 Cup for 2022, Petit joined CD Sport to race in the Silver Cup alongside Viny Beltramelli. On his return to the series, Petit scored a best result of sixth in class at
Le Castellet to end the year tenth in points. The following year, Petit made his debut in the
GT4 European Series with
Saintéloc Junior Team alongside Marc Lopez Gutierrez. In his rookie year in the series, Petit scored a best class finish of fourth at
Barcelona and ended the year 16th in points. For his sophomore season in the
GT4 European Series, Petit joined AV Racing to race in the Pro-Am class alongside Noam Abramczyk. In their only season together, the pair scored three class podiums which included a win at
Misano, as they ended the year third in the class points. Petit switched to Team Speedcar for 2025, joining
Grégory Guilvert in the Silver Cup for his third season in the
GT4 European Series. In the six-round season, Petit took his first podium at
Zandvoort and later scored his an overall win in race one at
Spa en route to a seventh-place points finish. Petit remained with the team for 2026, for his second season alongside Guilvert. == Racing record ==