BMW i8 Roadster - Powertrain
The BMW i8 Roadster 1.5 liter turbocharged three-cylinder petrol engine boosted to 231 hp and 320 Nm of torque. The BMW i8 Roadster benefits from a new, more powerful electric motor at the front, which produces 12 hp more at 143 hp and continues to be paired to a two-speed gearbox.
Total system output now stands at 374 hp. The battery is also more energy-dense with an increased cell capacity (34 Ah, up from 20 Ah) and higher gross energy capacity (11.6 kWh, up from 7.1 kWh). As a result, the all-electric range has seen a 50% jump over the previous i8, from 35 km to 53 km.
The BMW i8 Roadster is equipped with a 3.6 kW onboard charger, so charging the car to full takes under three hours through a 16-ampere/230-volt outlet. With a 10-ampere/230-volt domestic power socket, this increases to under four and a half hours.
The BMW i8 Roadster is supplied with a mode 2 charging cable as standard, enabling the battery to be replenished from a standard domestic socket in under four-and-a-half hours. The new mode 3 cable can also be used to hook up the car to a public charging point for high-power charging.
The BMW i8 Roadster power is sent to the rear wheels through an Aisin six-speed automatic transmission. The BMW i8 Roadster features a carbon fibre monocoque over an aluminium frame, which means that despite the fitment of a folding roof mechanism and additional strengthening struts and panels around the axles, the soft-top model is only 60 kg heavier than the hardtop, bringing the total kerb weight to 1,595 kg.
The topless i8 has model-specific tuning for the springs, damping and Dynamic Stability Control. The BMW i8 Roadster power is sent to the rear wheels.