Montier went into the business of selling and servicing cars, becoming one of the two agents of the Ford Motor Company in France.

Charles entered the Belgian Grand Prix on three occasions, his 1931 entry earning him 20th place in the first European Championship.

[8] An experienced racer and hillclimber,[3][8][9] Montier entered the Grand Prix d' Endurance de 24 Heures, also known as the 1923 24 Hours of Le Mans, alongside Albert Ouriou.

[16] The "dainty" Montier-Ford has since been called "perhaps the best Model T-based speedster ever created from the pedestrian farmer's fliver".

[14][21] The duo's third and final attempt at Le Mans, in 1925, was also unsuccessful as they were unclassified due to only completing 54 of the 117 laps required.

[33] Montier entered the 1931 Belgian Grand Prix championship event with co-driver "Ducolombier", finishing 8th, 30 laps down.

[44] A Montier Special with Ferdinand at the wheel turned up at the 1932 La Baule Grand Prix, however; the car on this occasion sported two engines "mounted in tandem for a total of 4072cc capacity"[45] instead of the Ford Model A-derived 3.3L straight 4 used hitherto.

[47] The race was won by René Dreyfus in his Bugatti Type 59 – the last Grandes Épreuves victory for the famous marque.

[50] It is unclear from contemporary reports, but researcher Leif Snellman believes Montier may have been driving the twin-engine car but it may have been the V8.