Pedzisa mutsara unotevera: Muna 1990, pamwe chete nevakwikwidzi vake veFormula Three Heinz-Harald Frentzen naKarl Wendlinger, akabatana nehurongwa hweMercedes hwevaduku mumakwikwi eWorld Sportscar Championship. Izvi zvakanga zvisina kujairika kumutyairi wechiduku: vazhinji vevanhu vakararama panguva yaSchumacher vakakwikwidza muFormula 3000 munzira yekuFormula One. Zvisinei, Weber akaudza Schumacher kuti kuratidzwa kumisangano yevashandi vepepanhau uye kutyaira motokari dzakasimba mumakwikwi marefu-refu zvaizobatsira basa rake. Mumwaka we1990 World Sportscar Championship, Schumacher akakunda mwaka wekupedzisira kuAutódromo Hermanos Rodríguez muSauber <unk> Mercedes C11, uye akapedza wechishanu muDrivers 'Championship kunyangwe achingotyaira mumakwikwi matatu kubva pamakwikwi mapfumbamwe. Akaenderera mberi nechikwata mumwaka wa1991 weWorld Sportscar Championship, achikunda zvakare mujaho wekupedzisira wemwaka kuAutopolis kuJapan neSauber <unk> Mercedes-Benz C291, zvichitungamira kunzvimbo yechipfumbamwe muDrivers 'Championship. Akakwikwidzawo pa
Le Mans mumwaka iwoyo, achipedza ari wechishanu mumotokari yaakagoverana naWendlinger naFritz Kreutzpointner. Muna 1991, akakwikwidza mujaho mumwe chete muJapan Formula 3000 Championship, achipedza wechipiri.