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The new Mercedes-AMG GLA 45 4MATIC+: A compact performance SUV to suit any lifestyle

A brisk lap of the race circuit or a weekend trip to the mountains with your sports gear stowed in the back: the new GLA 45 4MATIC+ (combined fuel consumption 9.2-9.1 l/100 km; combined CO2 emissions 211-209 g/km)1 and GLA 45 S 4MATIC+ (combined fuel consumption 9.3-9.2 l/100 km; combined CO2 emissions 212-210 g/km) are the assured masters of a multitude of disciplines. When required, these compact all-rounders can unleash a level of dynamic handling to impress even sports car owners. The 2.0-litre engine is the most powerful series-produced four-cylinder turbo engine and is available in two output and torque versions. Even the base model delivering 285 kW (387 hp) is more powerful than the previous model. The S‑variant rated at 310 kW (421 hp) jostles with considerably higher vehicle classes. The active, fully-variable AMG Performance 4MATIC+ all-wheel drive distributes the power to the rear axle wheel-selectively by AMG TORQUE CONTROL, so providing the basis for top traction in any driving conditions. The AMG SPEEDSHIFT DCT 8G dual clutch transmission apportions the power within a split second to suit the specific driving situation.
One new feature which makes a substantial contribution to the incomparable driving experience is the active, fully variable AMG Performance 4MATIC+ all-wheel drive: this system offers selective power distribution to the wheels on the rear axle via AMG TORQUE CONTROL. This means that the power is distributed to the left and right rear wheels flexibly and at different ratios, according to the given driving situation – resulting in optimum traction, whatever the road surface conditions and whatever course the route takes. This made possible by a redesigned rear axle differential featuring two multi-disc clutches, which selectively provide the flow of power to each individual rear wheel.
New four-cylinder turbo engine delivering superlative power
With an output of up to 310 kW (421 hp), the completely new Mercedes-AMG 2.0-litre engine is currently the world’s most powerful turbocharged four-cylinder manufactured for series production. Mercedes-AMG has improved on the output of the preceding engine by 30 kW (40 hp). Maximum torque has also increased, from 475 to as much as 500 newton metres.
The four-cylinder engine delivers extremely agile drive power in two output ratings: with 310 kW (421 hp) as the S-Model and with 285 kW (387 hp) in the base version. The new compact sports cars absolve the sprint from zero to 100 km/h in record time: the GLA 45 S 4MATIC+ requires just 4.3 seconds, while the base model GLA 45 4MATIC+ gets up to speed in 4.4 seconds. The top speed of the base model is electronically limited to 250 km/h, while the S-Model is allowed to leave the factory with a top speed of 270 km/h.
Apart from its pure performance figures, the new engine has an immediate response. To this end the torque curve was carefully balanced (“torque shaping”): The peak torque of 500 newton metres (480 newton metres for the base version) is available in a range of 5000-5250 rpm (4750-5000 rpm in the base version). With this configuration the AMG engineers have achieved a power delivery akin to a naturally aspirated engine.
Engine design featuring intelligent details
The new engine excels with numerous intelligent design features. In contrast to the likewise transversely installed four-cylinder in the 35-series models, the new engine has been turned around its vertical axis by 180 degrees. This means that the turbocharger and the exhaust manifold are now positioned at the rear, on the side of the firewall when viewed from behind. The intake system is therefore positioned at the front. This configuration allows the flattest possible and aerodynamically advantageous front section design. Furthermore, the new arrangement allows much improved air ducting with shorter distances and fewer diversions – both on the intake and exhaust side.
The new twin-scroll turbocharger combines optimum responsiveness at low engine speeds with a high power in the upper rpm range. The shaft of the compressor and turbine wheel is mounted for the first time on …
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