2018 BMW Z5: latest spy pics

BMW’s new Z5 roadster has been spotted testing again, looking more complete than when the BMW sports car was snapped in July last year.

The successor to the Z4 is being built in collaboration with Toyota, which will use the development for the next generation J29 Toyota Supra, though only in a hardtop coupe version.

The Z5 prototype spotted near the Arctic Circle is more developed since last year, with a more pronounced front bumper with diffuser, rear spoiler lip and properly installed tail lights.

The fabric roof also seems more like a production version, unlike the previous one which lacked a rear window and didn’t seem to fit as snug. This supports initial reports the Z5 is ditching the Z4’s retractable hardtop to save weight and lower the centre of gravity

The joint BMW and Toyota sportscar architecture revolves around the front firewall, which will allow for two very different looking cars.

Toyota will apparently provide its expertise with electronics and optional hybrid drivetrain, while the Germans will bring their lightweight materials and turbocharged engines to the table.

The combustion engines are expected to range from 140kW to a 320kW turbo donk under the long nose of the Z5 M, while the hybrid will produce around 150kW in power mode.

The German and Japanese models are expected to target different audiences, with the Z5 aiming to be a pure sports car rather than a look-at-me luxury roadster like its predecessor.

The Supra will be at the top of the Toyota brand's line-up and could feature cutting-edge technology in addition to the bold styling.

The BMW Z5 is expected to be launched early in 2018 with initial sales to commence in the Northern spring, though we’re not likely to see it here until later in the year.

Unlike the Z4 it’s expected to be serious competition to the likes of the Audi TT, Porsche 718 Boxster and Mercedes-Benz SLC and Jaguar F-Type.