Mercedes-AMG is aiming to convert hot hatch buyers to electric power with the new CLA 45, which brings supercar-baiting performance, advanced torque-vectoring technology and an ICE-aping exhaust note that even pops and bangs.
Available as both a saloon and a Shooting Brake estate, the first electric 45 model is substantially different under the skin from the regular CLA. It combines three axial flux motors developed by Oxfordshire firm Yasa with the larger, 94kWh battery from the forthcoming C-Class Electric and an aggressive design overhaul aimed at improving downforce without compromising range.
The tri-motor set-up - with two drive units on the rear axle and one up front - has a maximum output of 671bhp through all four wheels. The rear motors alone can combine to offer the full output, however: power is limited by the maxmimum throughput of the battery, and future updates could unlock more. This also enables a tyre-shredding drift mode.
The front motor engages only when extra traction is required, such as when setting a hot lap or driving in adverse conditions.
The generous reserves mean the 2.3-tonne saloon can hit 62mph from rest in 3.0sec (3.2sec for the Shooting Brake). That makes it quicker off the mark than many of AMG's most hardcore models, including the SLS AMG Black Series (3.6sec), and almost as quick as the F1-engined AMG One, which took 2.9 sec. The CLA 45 goes on to a top speed of 155mph, or 168mph when fitted with the optional AMG Dynamic Plus pack.
Acceleration is slowed slightly if the 'AMGForce' simulated engine and gearbox are engaged. This system replicates the sound and power delivery of the outgoing 45 models 'M139' turbocharged four-cylinder - the world's most powerful of its configuration in series production - and runs it through a synthesised eight-speed gearbox.
Vibrating motors are fitted in the front seats to ape the rumble of the petrol engine in the occupants backs, and the sound can be heard both inside and outside the car, with pops and crackles on the overrun. It has both quiet and loud modes, and Mercedes says the latter rivals aftermarket exhaust systems for audible impact.
The system engages when the S+ drive mode is selected, but it is disabled in the track-focused Race mode to maximise the car's outright pace.
AMG has also developed a predictive battery management system that maximises performance over the course of a fast lap by adapting power outputs based on where maximum performance is most needed: deploying full power around the entirety of a longer track would raise battery temperatures and force the car to limit its output, paring it back through bends reduces the heat and allows maximum thrust to be delivered for the length of a long straight, such as the Nordschleife's Döttinger Höhe.
