Four free-revving straight-six petrol engines make up the Z4 range. The basic 23i has a 201bhp 2.5-litre unit (which will be fast enough for most people) and the 30i a 255bhp 3.0-litre. Meanwhile, the 35i uses a twin-turbo 3.0-litre with 302bhp, and the 35is a 335bhp version of the same engine. The 23i, 30i and 35i come with a six-speed manual gearbox, while the 35is gets a seven-speed semi-automatic, which is an option on the regular 35i.
Every Z4 comes with Adaptive Chassis Control, which lets you alter the responses of the steering, throttle and stability control. However, we’ve only driven versions with adaptive suspension so far – a cost option on everything but the range-topping 35is. Even with this in its firmer setting, though, the ride is surprisingly supple for such a sporty car. There’s also loads of grip and little body lean, while the steering is sharp, if a bit short of feel.
The list of standard equipment includes 17-inch alloy wheels with run-flat tyres, xenon headlamps, dual-zone climate control and a CD player with an auxiliary input socket so you can connect up your iPod. The electrically folding tin-top is also included in the price.
