Haldex in Use
"Haldex LSC" refers to the coupling system — its most prominent uses are in all transverse engine 4x4 models of the Volvo Cars and the Volkswagen Group marques: Audi (A3, S3 and TT), Bugatti, SEAT, Škoda, and Volkswagen (Golf), making them non-permanent 4x4s, unlike longitudinal engine models (Audi A4, A6, A8, previous-Volkswagen Passat), which use a Torsen centre differential. However, its short reaction time (only a seventh of a wheel spin) relative to systems like a viscous coupling, and ability to fully lock mitigate its theoretical disadvantage to a full-time 4WD (like Torsen) setup.
The Haldex LSC has been used in 4WD models of Volkswagen by the name "4motion", and Audi cars under the name of "quattro". The same labels have also been applied to Torsen-based, permanent full-time 4WD systems from both Volkswagen and Audi, which has led to confusion, and some heated debate as to the relative merits of each system. This is due to confusion over nomenclature; based on the fact that some earlier Audi Quattro equipped vehicles did use a Torsen torque-sensing centre differential (the earliest, including the "Ur-Quattro" turbo coupe used a manually locking open center differential), many fans believe that "quattro" refers to the Torsen type of 4WD system, not realising that it is simply a trademark. (It is interesting to note that "quattro" is also used on the Audi Q7 SUV, which uses neither Torsen ( maybe this tip is not true: check here) nor Haldex; instead, it uses a BorgWarner system).
As can be seen, the Haldex LSC is used in conventional road-going cars, crossovers, and full-on SUVs.
Read more about this topic: Haldex Traction