He began racing motorcycles in 1928 and specialised in hill climbing. In 1935, Carl grew interested in midget racing and built his first racecar using a motorcycle engine. By 1936 he was firmly entrenched in midget racing and won the track championship at Sioux City, Iowa. Carl Forberg was among the first men to race midgets in the Omaha area in 1935 and built his first racecar using a motorcycle engine. He quickly found success, and later moved to Detroit, racing midgets with AAA. In 1951, after losing parts of the 1949 and 1950 seasons due to injuries suffered at a Chicago race, Carl, in the Auto Shippers sponsored Indy car, qualified 27th for the 500. He finished the race in 7th place, at the age of 40. In 1952 Carl suffered a back injury in a midget race and retired from driving, but that did not lessen his interest in racing. He began his role as a car owner. In the 1960s and 1970s he owned a USAC sprint car driven by Johnny Parsons Jr., Ralph Ligouri and Todd Gibson. His daughter was married to Pancho Carter.