The drift angle in the first Nordschleife bend is almost like a Moselle hairpin bend, in the Hatzenbach there is wild dust as the car cuts over the curbs, and actually the only thing missing are the vineyards off the Eifel asphalt – the Mercedes-AMG A 45 S 4Matic+ almost turns the Nordschleife into a special stage thanks to its highly dynamic all-wheel-drive technology and conjures up a bit of Rally Germany flair in the cockpit.
While the A 45 S is already lunging with a sharp two-liter growl out of the right-left corner combination of the Hocheichen section toward Quiddelbacher Höhe and the airfield, we briefly turn our attention to the standout technology highlight of the muscle A-Class.
Dynamic wonder all-wheel drive
Depending on the driving situation and the driving program, propulsion is distributed separately to both rear wheels. Control of the drive torques to the front and rear axles and between the two rear wheels is electromechanical.
The team from Affalterbach calls the variable all-wheel drive system “AMG Performance 4Matic+ with AMG Torque Control” with two electronically controlled multi-plate clutches, which are hidden in the rear axle transmission and are each connected to a drive shaft on the rear axle. This means that the drive power can not only be continuously and variably distributed between the front and rear wheels, but also between the left and right rear wheels.
Depending on the driving situation and the driving program, the drive is distributed separately to both rear wheels. The drive torques to the front and rear axles and between the two rear wheels are controlled electromechanically.
Six driving programs are available: Smooth, Comfort, Sport, Sport+, Individual and Race. The A 45 S will never become a sedan, but the drive programs offer an astonishing spread and influence parameters such as the accelerator pedal characteristic curve, shift times and shift points, the characteristic curve of the optional adaptive dampers, the steering characteristic curve and the setting of the exhaust gas flap system. It’s logical which setting is chosen for the Nordschleife visit: Race and ESP off! Attack!
253, 254, 255 km/h – the power of the hot A-Class becomes apparent at the latest when the compact sports car approaches the Schwedenkreuz section. Clock comparison: Here the A 45 of the predecessor series W 176 had “only” 243 km/h on its Nordschleife lap. With a rated output of 421 hp, AMG gives the inline four-cylinder turbo 40 hp more than its direct predecessor. And only finicky advocates of naturally aspirated engines harp on the fact that a gentle torque dip can be felt in the lower rev range. The maximum torque of 500 Newton meters (previously 475 Nm) is available at 5,000 rpm – the high-revving design almost has a bit of naturally aspirated engine character.