Skip advert
Advertisement

BMW i3 review – the city car perfected? - Engine and Gearbox

The BMW i3 is a genuinely impressive take on the electric city car.

Evo rating
  • Brilliant performance, great interior, stand-out looks
  • Range extender engine noisy, limited range without it

Engine and gearbox

At the heart of the BMW i3 is a bespoke electric motor tagged BMW eDrive, which its maker also refers to as hybrid synchronous in design. It was developed in-house and is also used in the BMW i8. It's mounted at the back of the car and drives the rear wheels through a single-speed transmission.

Advertisement - Article continues below

Although it revs to 11,400rpm and produces up to 168bhp, it's the torque output (184lb ft) that matters most, as it's available from the second you press the accelerator. The seamless, almost unrelenting acceleration that results from this is utterly comical at first because of the quietness that accompanies it and it becomes quite addictive.

Revealed in 2016 and updated for 2017, BMW has increased the size of the i3's battery pack. In electric-only form, capacity has leapt 50 per cent from 22kWh to 33kWh, yet the pack takes up no more space in the car's structure - an indication of the current rapid rate of progress within the industry. While the previous pack was good for around 120 miles on the European cycle (and less in real world driving) the new pack is apparently good for 195 miles.

The American EPA figures are probably more realistic indications of your actual range (and the general improvement): Previously, it rated the i3 as an 81-mile car, which has now climbed to 114 miles. Realistically you'll probably do a little better than that - 120-130 miles is achievable - but either way, a 30-odd mile gain is not to be sniffed at.

For the record, the range extender engine is a 650cc motorcycle-derived parallel twin-cylinder petrol unit mounted above the rear axle. Its 33bhp output is devoted solely to generating electricity - there is no physical connection between it and the wheels. It's fed by a miniscule nine-litre fuel tank, so-sized, we're told, to maintain the i3's boot space.

Skip advert
Advertisement
Skip advert
Advertisement

Most Popular

Lotus Exige V6 (S3, 2011-2021) review – a mini supercar for Golf GTI money
Lotus Exige S V6
In-depth reviews

Lotus Exige V6 (S3, 2011-2021) review – a mini supercar for Golf GTI money

For the S3 generation the Lotus Exige got a lot brawnier, trading the four-cylinder engines it had hitherto utilised for a supercharged Toyota V6
21 Aug 2026
Cupra Leon VZ review – Spain’s Golf GTI is better than Germany’s
Cupra Leon
In-depth reviews

Cupra Leon VZ review – Spain’s Golf GTI is better than Germany’s

The choice of full-sized front-drive hot hatches now doesn’t include the Civic Type R. Can the Cupra Leon VZ take the top spot?
25 Aug 2026
The 2-litre Mazda MX-5 has officially been axed in the UK, for good this time
Mazda MX-5 front
News

The 2-litre Mazda MX-5 has officially been axed in the UK, for good this time

As emissions regulations close in, Mazda has announced the discontinuation of one of our favourite current sports cars on sale: the 2-litre MX-5
25 Aug 2026