Audi has developed A4 Allroad quattro, an ultra version of the quattro all-wheel-drive (AWD) system. The system is going to be available for numerous Audi models that have their engines mounted longitudinally in the front. However, A4 Allroad quattro, all set to hit the market in the middle of this year, will be the first ever Audi to feature the ultra version of the quattro system.

The latest version features a set up that allow the rear axle and differential to be decoupled entirely, unlike Audi's previous Torsen and Haldex-based systems. It is capable of cutting friction losses and is believed to improve emissions and efficiency, reports CAR Magazine.

The new system shows no discernible differences to permanent systems with respect to traction and driving dynamics. This indicates a fuel saving measure and Audi claims for saving 0.3 liters for every 100 kilometers when tested in Ingolstadt traffic, according to a report published in the Jalopnik.

Audi's quattro ultra system is claimed to work in a predictive manner and uses an array of sensors to predict its intervention requirement. The system will analyze driver behavior, road condition information and driving dynamics analysis. The result is used to determine when the rear axle should be coupled back to the power train and for how long, reports Autoevoloution.