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Four 134bhp electric motors replace three less powerful ones for the new design, with two each driving each axle. Overall power rises from 321bhp to 536, with peak output available over a much broader operating range than before. The motors are still ostensibly the same as the ones that power Mitsubishi's i-MiEV production EV, fitted with more sophisticated electronic controllers.
While the two front motors drive through a common transmission, those at the rear operate through individual sets of reduction gearing per wheel, allowing for a much more advanced and fast-acting asymmetrical Super All-Wheel Control (S-AWC) four-wheel drive setup than previously. The motors are also capable of quicker regenerative braking, and more effective independent torque vectoring for better yaw control.
Power for the motors comes from a new 50kWh lithium-ion prototype battery pack (up from 35kWh) from Japanese supplier LEJ, positioned below the cabin floor rather than in the sidepods as before. The batteries have a carbonfibre-reinforced polymer casing, which saves weight and increases overall ridigity. They also provide a flat underbody for the car, which helps en route to the production of as much as four times the downforce of the Evolution I.
The MiEV Evolution II's construction is tubular steel, clad in carbonfibre body panels. Its weight is unconfirmed, but will be declared at scrutineering for the hillclimb this week. It's expected to be less than the 1400kg of last year's car.
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