ISSUE 012 Winter 2021 Sigma Powertrain EMAX transmission dossier l In conversation: David Hudson l 48 V systems focus l 2021 Battery Show North America and Cenex-LCV reports l Everrati Porsche 911 digest l Switching insight l Motor laminations focus

The VCU will open up further opportunities in terms of higher and more complex safety functions for the BMS and inverter, as well as additional drive modes, of which the Pure edition 911 currently has two. These are a Standard mode and an Eco mode, the latter featuring significantly reduced discharge rates and higher regeneration rates (depending on the SoC) across the range of operating speeds. “Through the VCU, we could also remotely add firmware for adaptive cruise control, or maybe a Race mode in which we could change the rear- wheel gain, or have the regen and throttle delivery purposely lose traction at the rear when you want to,” Kerr suggests. To track speed, distance, SoC and other values with the same aesthetics and behaviour of the original sportscar, a bespoke gauge cluster has been designed and supplied by UK companies, with all-analogue dials and meters across the dash, driven by CAN bus measurement data from the BMS and motor controller. “For example, the power gauge dynamically tracks how hard your right foot is on the accelerator pedal, the speedometer is essentially identical to the original, and we have an OLED display for showing various subsystem diagnostics and system warnings,” Kerr explains. “The old engine water temperature dial now shows battery temperature, and we’ve kept the old analogue warning lights as they were but they now correspond to key parameters tracked by the BMS.” Environmental control is achieved through an HVAC system built around a 2.2 kW positive temperature coefficient heating element. While that is powered by the high-voltage system, all the driver systems are powered by the DC-DC converter, which steps the battery’s 360 V down to 12 V for the gauges and controls. Future Everrati models With widespread acclaim for the 911 EV among e-mobility engineers as well as classic car lovers, Everrati is moving forward with its next projects. The first is a resto-mod of the Ford GT40, most famous for its win at Le Mans in 1966. “If ever there’s a car that needs both high power output and precise NVH recreation for accurately emulating how it felt to drive, it’s the GT40,” Williams remarks, alluding to the dual-motor, 800 bhp, 800 Nm powertrain he and his company will equip the vehicle with. It will closely resemble the one in the 911 – a deliberate choice on Everrati’s part to minimise r&d costs for subsequent projects. “There’ll be other changes for the GT40 too, such as transducers inside the seats to replicate the rumbling, physical crescendo of that car’s fuel powertrain,” Kerr notes. It will also integrate a 46 kWh battery pack, liquid-cooled and supplying power over a 700 V bus. More recently, Everrati has announced it is resto-modding the Land Rover Series IIA as well. It will have a 60 kWh battery pack and a 150 bhp, 300 Nm powertrain with both two- and four-wheel-drive modes. The company has also worked extensively on a resto-mod of the pagoda-roof Mercedes-Benz W113 SL. Still regarded as one of the most beautiful cars ever made, Everrati’s version will be fitted with a 180 bhp, 550 Nm AC motor and enough battery energy for 160 miles between charges. With all three vehicles now available for pre-order, Everrati looks set to return a stunning collection of cherished icons to 21st century roads. Speci ications Porsche 911 EV resto-mod Weight: 1440 kg Three-phase AC induction motor 52.8 kWh lithium-ion battery pack AC and DC charging Standard/Pure edition Narrow-body coupe Top speed: 130 mph Power: 440 bhp Torque: 460 Nm Range: 180 miles Acceleration: 0 60 mph in 4.5 seconds Signature edition Wide-body coupe Top speed: 130 mph Power: 500 bhp Torque: 500 Nm Range: 150 miles Acceleration: 0 60 mph in just under 4 seconds A bespoke analogue gauge cluster reports live health and performance metrics such as battery energy and cell temperature Winter 2021 | E-Mobility Engineering 55 Digest | Everrati Porsche 911