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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.
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.
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.
None of the above trademarks is specific to any particular 4WD system or technology being employed. Generally, Volkswagen would use Haldex Traction clutch system on their "4motion" transverse engined cars. For longitudinal engined cars, they would use a Torsen limited-slip differential-based 4WD system or lockable centre differential instead. [3]
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 Audi S1 was Audi's smallest S model car and a performance version of the Audi A1.The first variant (Typ 8X, produced from 2014 to 2018) has 228 hp (231 PS / 170 kW) derived from the Volkswagen group's EA888 2.0 litre turbo four cylinder, and on demand Haldex Quattro four-wheel-drive.
The Jeep Wrangler (pictured is a TJ Wrangler) is a 4WD vehicle with a transfer case to select low-range or high-range four-wheel drive.. A four-wheel drive, also called 4×4 ("four by four") or 4WD, is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously.