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GLA 45 S 4MATIC+
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  Mercedes-AMG GLA 45 S 4MATIC+
 

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Country of origin:Germany
Produced in:2020
Introduced at:2020 Geneva Motor Show
Source:Company press release
Last updated:February 26, 2020
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Click here to download printer friendly versionA 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+ and GLA 45 S 4MATIC+ 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. This is made possible by a new rear axle differential featuring two multi-disc clutches – one for each rear wheel. The AMG SPEEDSHIFT DCT 8G dual clutch transmission apportions the power within a split second to suit the specific driving situation.

"The second generation of our very successful compact sports model is now complete. The GLA portfolio, in the form of the Mercedes-AMG GLA 45 and GLA 45 S, now also includes our innovative four-cylinder turbo engine, so setting the benchmark in this segment. In addition, the new GLA 45 is not only significantly more dynamic, but also more practical in everyday use than its predecessor, thereby ensuring its appeal to a dynamic, lifestyle-oriented target group", says Tobias Moers, Chairman of the Board of Management of Mercedes-AMG GmbH.

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.

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.

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 anti-friction bearings, so minimising mechanical friction in the turbocharger. The charger therefore responds even more readily and reaches its maximum speed of up to 169,000 rpm more rapidly. With a maximum charge pressure of 2.1 bar, the 2.0-litre four-cylinder turbo engine is also the leader in its segment in this respect. The electronically controlled wastegate (exhaust relief valve) allows the charge pressure to be controlled even more precisely and flexibly while optimising responsiveness, especially when accelerating from partial load. Numerous parameters are taken into account in this process.

For the first time, the new high-performance four-cylinder has two-stage fuel injection. In the first stage the particularly fast and precisely operating piezo injectors supply fuel to the combustion chambers at a pressure of up to 200 bar. This is a multiple process at times, and is controlled by the engine management system as required. In the second stage there is additional intake manifold injection using solenoid valves. This is needed to achieve the engine's high specific output. The electronically controlled fuel supply has an operating pressure of 6.7 bar.

The high output requires an intelligently conceived cooling system. This is so designed that the cylinder head and crankcase can be cooled to different temperature levels. This innovative measure allows a cold cylinder head for maximum output with efficient ignition timing, and a warm crankcase to reduce in-engine friction. Cooling of the cylinder head is ensured by a mechanical water pump, while cooling of the crankcase is via a second, electrically driven high-performance water pump. After a cold start, this pump remains passive until the engine has warmed up. In operation it is regulated by the engine control unit so that the crankcase is always cooled according to need.

The new engine is entirely assembled by hand. To this end a completely newly designed production line was constructed in the AMG engine production facility in Affalterbach, where Mercedes-AMG has raised the "One Man, One Engine" principle and Industry 4.0 processes to an innovative level reflecting the latest findings in ergonomics, material flows, quality assurance, sustainability and efficiency. On the road to implementing Industry 4.0, AMG's hand assembly operation likewise follows the vision of "smart production". This excels with high flexibility, and is transparent and highly efficient. It safeguards and improves the quality of the engines and production processes using innovative and digital technologies.

The 8-speed AMG SPEEDSHIFT DCT 8G dual-clutch transmission likewise contributes to the agile and dynamic character. The gear ratios have been configured so that the driver experiences very spontaneous acceleration in all speed ranges, combined with fast shifting and optimum connections when shifting up. Depending on the selected AMG DYNAMIC SELECT driving mode, the driver receives a specific drive configuration with different accelerator and gearshift characteristics.

The standard RACE-START function allows maximum acceleration from stationary and provides together with the drive sound with partial ignition interruption when changing up a gear, and the automatic double-declutching function when changing down for typical AMG driving pleasure. Neither is efficiency neglected: in "Comfort" mode the ECO start/stop function is active; the "gliding" function can be selected in the "Individual" driving mode.

The extremely dynamic driving experience in a completely new dimension is greatly assisted by the fully variable all-wheel drive included as standard. The secret is AMG TORQUE CONTROL in the new rear axle differential: this has two electronically controlled multi-disc clutches, each of which is connected to a rear axle drive shaft. In this way, the power can not only be variably distributed between the front and rear wheels, but also selectively between the left and right rear wheel. The result is consistently optimum traction, even in adverse road conditions and during extreme cornering manoeuvres, for example on the racetrack.

Control of the drive torque to the front and rear axle, and between the two rear wheels, is electromechanical. The influencing factors for torque distribution are not only the driving speed, the lateral and longitudinal acceleration and the steering angle, but also the difference in rotational speed between the individual wheels, the gear selection and the accelerator position. The main advantages of electromechanical control over an electrohydraulic system relate to more refined driving dynamics – primarily due to the significantly faster response and speed-independent actuation of the discs over the entire adjustment range.

The characteristics of the all-wheel drive control are dependent on the driving mode and the AMG DYNAMICS setting. In "Basic" and "Advanced", the 4MATIC system is in "Comfort" mode. In "Pro" and "Master" (standard for S-Model, included in the optional AMG DYNAMIC PLUS package for the base model) the 4MATIC system switches to "Sport" mode, for even more agile handling and an even higher threshold for the critical limits.

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  Article Image gallery (20) Specifications