Every August, the Bonneville Salt Flats fill with streamliners, lakesters, and vintage muscle cars chasing a record that could vanish within a year. Speed Week traces back to 1937, when a handful of Southern California car clubs founded the SCTA to bring order to dry-lake racing. By 2017’s 69th running, it had become something rarer: a motorsport with no purse, no crowd, and nothing to prove except how fast you really are.