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| - R.T. Quaife Engineering, Ltd. is a British manufacturer of automotive drivetrain products. It designs and manufactures motorsport and performance orientated gearboxes, gearkits, differentials, steering racks and axle kits, along with many other associated drivetrain products. The company was founded in 1965, by Rod Quaife and is now run and owned by , Sharon's son Adrian Quaife-Hobbs is the owner of Pro-Sim and is a professional racing driver. Based near Sevenoaks, Kent they have two sites, one in Sevenoaks and the other, their OEM production facility, in Gillingham. (en)
- La R.T. Quaife Engineering, Ltd. o semplicemente Quaife è un'azienda britannica specializzata nella progettazione e produzione di gruppi di motopropulsione e cambi per automobili. Inoltre la loro competenza si estende anche nel campo delle corse automobilistiche, applicando le loro conoscenze a veicoli di serie, come ad esempio la sostituzione di ingranaggi o la trazione integrale. Nella sua storia, la Quaife ha anche costruito vetture da competizione complete, come la R4 GTS del 1998, che ha partecipato al . Nell'autunno del 2012 la società ha acquisito la società Tran-X. (it)
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| - R.T. Quaife Engineering, Ltd. is a British manufacturer of automotive drivetrain products. It designs and manufactures motorsport and performance orientated gearboxes, gearkits, differentials, steering racks and axle kits, along with many other associated drivetrain products. The company was founded in 1965, by Rod Quaife and is now run and owned by , Sharon's son Adrian Quaife-Hobbs is the owner of Pro-Sim and is a professional racing driver. The early days at Quaife were spent manufacturing performance motorcycle gearkits, most notably close ratio 5-speed units for Triumph, BSA and Norton. Quaife also took on subcontracted work from AMC; the makers of Matchless and AJS motorcycles. Quaife gearkits were used to achieve victories in the Daytona Speedway and Isle of Man TT. Based near Sevenoaks, Kent they have two sites, one in Sevenoaks and the other, their OEM production facility, in Gillingham. Quaife's signature product is its line of automatic torque biasing differentials, a form of limited slip differential that employ helical gears rather than clutch mechanisms that are controlled mechanically. These differentials are usually available as aftermarket items, but for some models are specified by automobile manufacturers as OEM equipment. Quaife's ATB differential is now available in over 300 different applications, covering everything from Alfa Romeo to Volvo. Originally developed in the 1980s, the ATB differential appeals to many performance and racing car enthusiasts for its mix of traction-enhancing abilities, reliability, smooth operation and its 'fit and forget' installation. Within many markets, the Quaife ATB differential also comes with a lifetime warranty; applicable to both road and race environments. Aside from manufacturing precision engineered differentials, Quaife also produces highly sought after sequential gearboxes. The Quaife QBE60G and QBE69G heavy duty 6-speed sequential gearboxes are offered with several bell housings to fit a number of popular racing applications. Other sequential transmissions cater for applications including the Ford GT40, Land Rover V8, Mitsubishi EVO 4–9, Nissan Skyline GTR R32-R34 and Porsche 996 and 997. Quaife also offers many transmissions in synchromesh and dog engagement formats. Quaife's range of motorsport gearkits replace the standard internals of many popular transmissions found in both classic and contemporary vehicles. Initially the company focused on classic British cars as well as those manufactured by Ford Motor Company. Over recent years, the company has expanded its gearkit offering by catering for many front-wheel drive vehicles including Honda K-Series, Volkswagen 02M/02Q and a number of Ford applications. Elsewhere, Quaife driveline components can be found in a wide range of vehicles, including those from Radical Sportscars, Caterham, Ginetta, Morgan Motor Company and Donkervoort. Quaife sequential transmissions help to power Mini JCW Challenge race cars, while the Ligier JS P4 manufactured by Onroak Automotive uses Quaife sequential technology. Quaife has also briefly built complete road cars, with the R4 GTS in 1999 which also competed in the British GT Championship. The company has also produced a roadster which was known as the R40. Quaife continues to manufacture and supply ATB differentials for Ford Motor Company, for the Fiesta ST, Puma ST and Transit Custom, and Lotus Cars, for the Evora. With electric vehicles becoming more and more prominent, Quaife has developed ATB differentials for the Tesla Model S and Model 3, and is looking to further expand the range of EV drivetrain products as the move to electric propulsion progresses. (en)
- La R.T. Quaife Engineering, Ltd. o semplicemente Quaife è un'azienda britannica specializzata nella progettazione e produzione di gruppi di motopropulsione e cambi per automobili. Inoltre la loro competenza si estende anche nel campo delle corse automobilistiche, applicando le loro conoscenze a veicoli di serie, come ad esempio la sostituzione di ingranaggi o la trazione integrale. Quaife produce una linea di differenziali automatici chiamati Automatic Torque Biasing Differential, una sorta di differenziale a slittamento limitato che utilizza ingranaggi elicoidali controllati meccanicamente o dal computer a bordo veicolo. Nella sua storia, la Quaife ha anche costruito vetture da competizione complete, come la R4 GTS del 1998, che ha partecipato al . Nel 2005 per celebrare i suoi 40 anni di attività, la Quaife ha prodotto una autovettura in tiratura limitata, denominata R40; si tratta di una roadster equipaggiata con un motore Ford Duratec HE posizionato centralmente che può avere vari tagli di potenza, da 185 CV, 220 CV e 250 CV. L'azienda è stata fondata nel 1965 da , attualmente è di proprietà di e di sua sorella (direttore finanziario). Il figlio di Michael, e suo cugino, Adrian Quaife-Hobbs sono entrambi piloti professionisti. Nell'autunno del 2012 la società ha acquisito la società Tran-X. (it)
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