POWER TRAIN
to vehicle speed, drive profile or customer preference. The original drum brakes have been replaced by discs all-round. Where the transmission is concerned, the original gearbox has been removed and the motor output shaft goes directly into the original transfer box retaining high or low ratio, and the option to select two- or four- wheel-drive. Regenerative braking is also
an option, more for the driving experience rather than as a range extender. This can be tuned by the VCU to be mild or aggressive depending on the tastes of the customer. Drive modes can also be selected by the driver using a switch on the dash to change the level of regen braking and available power. Bolt says, “We are very lucky with our location, being near an old airfield
which we use as proving ground. This has given us the opportunity to fine-tune the regen to get precisely the right amount coming in at the right time. We spent a lot of time in the test and validation process to balance the regen with the mechanical braking and it’s become very predictable, almost to the point that you don’t know it is happening.” This forms parts of the wider final
pre-delivery phase, lasting up to 6 months. Once registered and road legal, many miles are done offsite to complete the testing. Bolt adds, “A big part of our test and validation is systems testing, such as UN REG100.1 for high-voltage safety, as well as UN REG10 electromagnetic compatibility testing. It’s quite a tough process, but we end up with a better product. Everything we learn feeds into the next VCU.”
All this effort does come at a cost.
Depending on the final specification, prices can be anything from £170,000 (around USD 214,000) on top of the base vehicle, but it doesn’t seem to be putting customers off. Bolt observes, “People love classic cars because of the way they look, feel and drive. Electrification can bring practical reliability without compromising on the passion and enthusiasm and when you couple this to emissions legislation, such as cities increasingly operating ultra-low emission zones, I see this type of EV market growing. This will only be accelerated by advances in technology, in particular where batteries are concerned.” ●
For more information visit
www.Everrati.com
The powertrain features off-the-shelf components managed by a custom vehicle control unit (VCU)
www.engineerlive.com 9
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