Output is electronically controlled using the clutch system to vary torque to the axles every 0. Dynamic stability control is combined with an xDrive system to enhance the on-road capabilities by braking the inside wheels and cutting power across the axles to enhance rotation of the car.
Predictably, xDrive is a rear-biased system — as chosen by BMW — with a split from front to rear. Although this may seem detrimental to AWD performance as less torque is being applied in the location of the heavy engine for traction, the firm has kept to its dogma and decided that its AWD cars need to still feel and act like true BMWs on the road.
Which system is better? It depends who you ask, as the Internet is wash with videos and forum arguments over which is superior. It is hard to trust any DIY comparison videos due to the ferocity of the rivalry, with any sort of bias to one or the other making a test immediately tarnished.
Accusations of tampering with stability control settings and ham-fisted driving often scuppers the chance of a fair result being established. Tyres are also a massive factor — since they are the only contact patch with whatever surface is at hand, the compounds would need to be identical in makeup and wear to perform a valid test, adding to a huge list of variables. The purely-mechanical nature of quattro all-wheel drive makes it a relatively simplistic system, but one that has worked tremendously for Audi ever since it tore up the 80s rally scene.
The locking differentials can hinder a Quattro car in very specific situations however. Quattro in its basic form cannot fully lock an axle like the BMW can, with always some torque output reaching both.
The mechanical nature of the Torsen differential means that if zero traction is found on an axle, it has zero resistance to send to the other side of the vehicle. The centre diff is essentially a torque multiplying device so if complete traction is lost at an axle, things can get very tricky for quattro. The packaging space needed for the quattro system means that the engine has to be pushed further up the chassis.
This makes for the front-heavy weight distribution that has plagued Audis for decades, with quattro cars becoming synonymous with understeer. So while BMW enthusiasts might mock Audis for being front-biased, proper Quattro-equipped Audis are actually rear-biased. There are several benefits to Quattro. Both systems have their advantages and, honestly, both systems work incredibly well. However, both are great in almost any condition, which just shows how far all-wheel drive technology has come.
Facebook Twitter Email. It is a proactive system, which means it distributes torque equally to the axle that has more grip. Drivers cannot notice the instantaneous response to wheel speed differences during this adjustment of power to the wheels with the most traction. Traditional all-wheel drive systems, on the other hand, are reactionary systems. This means it waits until poor road conditions are encountered to adjust torque.
Because they are not proactive, traditional systems are unable to sense and predict when all-wheel drive might be needed and adjust accordingly. The quattro system has one center differential mounted in the gearbox. In contrast, traditional transfer boxes have differentials mounted on each driven axle.
By allowing a central location inside the gearbox, Audi quattro vehicles are lighter and more nimble. Traditional all-wheel drive vehicles have a bulkier transfer box and weigh more, affecting the ability to corner quickly.
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