 Ramba uchinyora ndima iyi - Achityaira Mercedes, Wagner akapedza ari wechipiri kuna Christian Lautenschlager mu1914 French Grand Prix paLyon. Akakwikwidza mu1919 Indianapolis 500achityaira Ballot asi akabuda aine vhiri rakaputsika panzira 45. Muna 1924 akatyaira timu yeAlfa Romeo, muP2 padivi paAntonio Ascari naGiuseppe Campari. Muna 1926, Wagner akabatana naRobert Sénéchal kuti vatyaire Delage 155B kuti vakunde muBritish Grand Prix yokutanga. MunaAugust akahwina Grand Prix de la Baule muDelage 2LCV. Mukuwedzera kumakwikwi eGran Prix, Wagner akakwikwidzawo mumakwikwi emaawa makumi maviri nemana eLe Mans. 