4motion vs quattro

[dman78 1]

just wondered whats the difference between the vw haldex system and the audi quattro system

[dman78 1]

????

[UnitedMotorsport 55]

A quick google search revealed this!!!!

http://en.wikipedia.org/wiki/Quattro_(four_wheel_drive_system)

[bungy 2]

quattro always spelt with a lower case "q" is a permanent 4wd system whereas the haldex system has drive going to the front wheels permanently and a drive shaft to the rear. Before the rear differential there is a clutch that has its own ecu. When required the clutch engages and transmits drive to the rear aswell as to the front. Benefit of this system is the lack of drag when awd is not required and the fuel saving of not powering an additional differential while still giving swift transition to 4wd as and when the ecu sees a requirement for it. I think that explains it.

[bungy 2]

Here's the graphic of how the haldex works

[dman78 1]

yep cheers mate

[Lukey. 381]

The A3/TT uses the same system as the golf, its not quattro, audi just market it as being.

Audis quattro proper 4WD is for longitudinal engines only, transverse engine cars have the haldex system which is primarily 2WD until a traction drop is detected, the drive bias is still to the axle on the engine side of the car

this vid demonstrates the "4WD when required" nature of the haldex

http://www.youtube.com/watch?v=1OL3Iyr96Y8

[rodney 17]

Those blokes in white overalls are quite clever and I do think this is the best discription I have read...