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Haldex Traction is a manufacturer of intelligent all-wheel drive (AWD) systems, founded in Sweden. Since the invention of Gen I in 1998, the company produced several generations of products licensed to and customized for some major automotive brands, that in turn have marketed Haldex Traction AWD under different names.
The original quattro centre differential (1980). Volkswagen Group has been developing four-wheel drive (4WD) systems almost since its inception during the Second World War.The Volkswagen Kübelwagen, Volkswagen Schwimmwagen, and Volkswagen Kommandeurswagen were all military vehicles which required all four road wheels to be "driven", the latter being a 4WD Volkswagen Beetle.
The Audi S3 is a hot hatch version of the Audi A3 small family car, produced by German automaker Audi since 1999. S3 variants of both the first- and second-generation Audi A3 have been produced. Like all Audi S models, it is only available with quattro four-wheel drive system.
At the Paris Motor Show in 2010, Audi presented the quattro concept on the occasion of the 30th anniversary of the original Audi Quattro and the Audi quattro four-wheel-drive system. Based on the RS5 , it features a modified 2.5 L five-cylinder TFSI engine shared with the TT and a 6-speed manual transmission from the S4 .
Audi is using the "Q" for the designation of their quattro four-wheel drive system, used in production cars for over twenty-five years (Audi's Quattro trademark is actually an umbrella term for several types of four-wheel-drive systems developed by Torsen, Haldex Traction AB, and Borg-Warner, the latter being used in the Q7).
The four-wheel drive A3 1.8T Quattro used either the 150 PS (110 kW; 148 hp) or 180 PS (132 kW; 178 hp) engine, and the same Haldex Traction-based quattro system as the Audi S3 and Audi TT.
An additional example is the SAAB XWD (Haldex Generation 4) with eLSD, which uses a common (electronically controlled via the vehicle computer network) hydraulic power pack to control both the longitudinal and transversal torque transfer of the XWD system. [21] The same Haldex system is used on several other GM Epsilon based vehicles such as ...
A Haldex system does have slightly better mpg because it has less rotating mass. This is because a center diff system has 3 diffs, 3 driveshafts (although one is rather short in an Audi) and 4 halfshafts. A Haldex system has 2 diffs, 1 driveshaft and 4 halfshafts.