What is it?
The SLS E-Cell. A very new, very yellow plug-in electric supercar that is undergoing intensive development at AMG’s skunk works on the outskirts of Stuttgart, with sales set for late 2012.
The SLS E-Cell driven here is the first running prototype Mercedes-Benz’s AMG division has constructed as part of a three year development program for the new car.
As its familiar appearance suggests, the SLS E-Cell uses the same aluminium intensive body shell as the SLS AMG with some slightly different detailing, including a totally flat undertray to lower the overall drag co-efficient.
However, some serious changes have taken place underneath. In a move that provides it with a weight distribution of 46:54 front-to-rear and lowers the crucial centre of gravity by 24mm over its petrol engine sibling, Stuttgart’s new age supercar uses four individual motors – one at each corner.
They combine to produce 526bhp and a mighty 649lb ft of torque. By comparison, the SLS AMG’s naturally aspirated 6.2-litre V8 delivers 563bhp and 479lb ft.
But while the SLS AMG places its drive through the rear wheels, the SLS E-Cell gets it down via two individual transmissions from Getrag – one mounted on each axle - to all four wheels. Mercedes-Benz has also provided it with torque vectoring.
Other changes? The packaging of the two motors up front has also required a rethink of the suspension; the standard SLS’s double wishbones makes way for a new multi-link arrangement complete with space saving pushrod dampers. The rear multi-link set-up, on the other hand, remains largely unchanged.
The electric motors draw from a bank of lithium-ion batteries mounted under the bonnet, down the middle of the floorpan and behind the seats. They have a capacity of 40Ah, are rated at 48kWh and add a hefty 450kg to the car’s weight.
Recharging is via a multi-pin 240 volt plug, with total recharge time of eight hours at 16 amps. With an external 240 amp charger this can be reduced to less than one hour, although the values are in no way final.