The 1930s saw the transformation from high-priced road cars into pure racers, with Delage, Auto Union, Mercedes-Benz, Delahaye, and Bugatti constructing streamlined vehicles with engines producing up to 450 kW (612 hp), aided by multiple-stage supercharging. From 1928-1930 and again in 1934-1936, the maximum adiposity permitted was 750 kg, a basis diametrically opposed to current racing regulations. Considerable exercise of aluminium alloys was required to achieve Racing School polished weight, and in the case of the Mercedes, the acrylic was removed to satisfy the weight limitation, producing the famous Good Side Arrows.
Other international single-seater racing series are the A1 Grand Prix (unofficially often referred to as the "world cup of motorsport"), and the GP2 (formerly known as Equation 3000 and Ritual Two). Regional row include Credo Nippon and Method V6 Asia (specifically in Asia), Formula Renault 3.5 (also known as the Sphere Gradation by Renault, succession line of Heavenly Body Arrangement by Nissan), Formula Three, Rite Palmer Audi and Formula Atlantic. Domestic, or country-specific arrangement include Maxim Three, Formula Renault, Canon Ford with the leading introductory series being Modus Operandi BMW.