Superchargers were banned for motorcycle racing from 1946, so that may have reduced speed too.
In 1926, the United States Army was very interested in the turbo-supercharger as a way of improving engine performance, and requested that one be added to the last of the PW-9s, and the engine upgraded to a 510 hp Packard 1A-1500.
This was to be a two-seater powered by a Rolls-Royce Kestrel S engine fitted with a similar two-stage supercharger installation and generating 500 hp (370 kW).
His work to remedy high gasoline prices resulted in the first Weber carburetor, a "sidedraft, double-throat ... bolted to a Weber designed overhead-valve/supercharger conversion for the 501 Fiat".
A real effort to improve the performance of the engine in 1938 resulted in the Hispano-Suiza 12Y-45, which used the S-39-H3 supercharger co-designed by André Planiol and Polish engineer Joseph Szydlowski.
These trucks featured a special Ivan Stewart signature package with Toyota Racing Development (TRD) wheels, grille, interior, and supercharger.
The steam plant for these ships consists of two Combustion Engineering or Babcock & Wilcox "D" type boilers, each equipped with a high-pressure (supercharger) forced draught air supply system, allowing a plant working pressure of 1,200 psi and 1000 °F superheat.
Turbochargers and superchargers allowed for petrol engines with a maximum displacement of 2000 cc (122 ci) and for diesel engines with a maximum displacement of 3700 cc (225.8 ci), restrictor-limited to around 700 bhp.
British luxury apparel manufacturer Aquascutum was also commissioned to design an exclusive interior appearance package for the Debonair, soon after the company had been purchased by Japanese textile conglomerate company Renown Incorporated; the supercharger was installed optionally with this particular trim package.
Engine options that were considered included an alternative fuel steam engine, based on earlier designs by Abner Doble, or a two-cycle gasoline engine with a McCulloch/Paxton supercharger.
Furthermore, on September 25, 1953, in Jabbeke (Belgium), a Z-102 Touring BS/2.8 (the old Barchetta used at Le Mans, 2.8 litre single supercharger), driven by Celso Fernández, broke four official R.A.C.B. (Royal Automobile Club de Belgique) worldwide records (fastest of them, 243.079 km/h (= 151.042 mph) average in the flying-start kilometer), previously owned by a Jaguar XK120.
The Greenpeace SmILE concept car uses a Hyprex pressure wave supercharger developed by the Swiss company Wenko AG.
It is frequently used as a supercharger in engines, where it is driven directly from the engine's crankshaft via a belt or, in a two-stroke diesel engine, by spur gears.
Additionally, the energy cost to drive a supercharger is higher than that of a turbocharger; if it is bypassed, the load of performing compression is removed, leaving only slight parasitic losses from spinning the working parts of the supercharger.
R.VI serial number R.30/16 was the earliest known supercharged aircraft to fly, with a fifth engine - a Mercedes D.II - installed in the central fuselage, driving a Brown-Boveri four-stage supercharger at some 6,000 rpm.