BMW 4 Series: Hot M4 trio to lead sportier line-up

Of the three bodystyles offered today, around 50% of buyers choose the Gran Coupé, while the Coupé and Cabriolet each account for around 25%.

BMW has committed to significant modifications over the 3 Series to provide the 4 Series with greater individuality and increased standing within the line-up.

Leading the host of changes is that striking new look. Inspired by the vertical kidney grilles that graced BMWs from the 1930s, the bold front end has been described by design chief Stefan Woerns as the first step towards giving each BMW model a unique interpretation of the brand’s most recognisable styling element.

When it goes on sale in the UK later this year, the 4 Series Coupé will offer up to three petrol and three diesel engines, each with four or six cylinders.

Autocar has already driven prototype versions of the 255bhp 430i and 369bhp M440i xDrive petrols, while German automobile registry records show that the range will also feature an entry-level 420i and 420d, 430d and M440d diesels.

The M440i and M440d M Performance variants will both feature 48V mild-hybrid technology, providing off-throttle engine-idle coasting, regenerative braking and a Sprint mode that calls up an additional 11bhp and 15lb ft of torque for stronger acceleration under load.

Further developments for the 4 Series include a raft of unique structural stiffening measures to provide it with greater steering precision and improved suspension control. There are new front suspension strut tower braces within the engine bay and work has been carried out to increase the rigidity of the rear suspension.

Like the 3 Series, the 4 Series will get BMW’s lift-related dampers as standard, bringing progressive damper control qualities. Adaptive dampers will be standard on the M440i xDrive and M440d xDrive and part of an optional M Sport pack on other models.

In a return to its roots (it was called the 3 Series Cabriolet from its arrival in 1985 until 2013), the 4 Series Cabriolet will swap its folding hard-top roof for a multi-layer fabric structure. Similar to the arrangement on the 8 Series Cabriolet, this will include a composite tonneau cover and a dedicated stowage area.

The M Performance pair will be the initial range-toppers, before the second-generation M4 – developed under the codename G82 – arrives in the autumn of 2021.

The M4 will again be offered with the Coupé and Cabriolet bodystyles, as well as in standard rear-wheel-drive and top-spec four-wheel-drive Competition forms.

However, it is not yet clear whether both variants will be offered to British buyers or, as with other recent M cars, only the Competition.

The regular M4 will use the twin-turbocharged 3.0-litre straight-six engine, known as the S52, that features in the recently launched X3 M and X4 M SUV duo and is also set to be used by the new M3 saloon.

With a six-speed manual gearbox and traditional rear-wheel drive, the M4 will produce 473bhp and 443lb ft of torque in its standard guise.

Meanwhile, the 503bhp M4 Competition will feature an eight-speed torque-converter automatic gearbox and a fully variable M xDrive four-wheel drive system, mirroring the more powerful M5 saloon.

By comparison, the current M4 uses the older S55 turbocharged 3.0-litre straight six to deliver 425bhp and 406lb ft in its standard specification and 454bhp and 443lb ft in the M4 CS (which retains rear-wheel drive).

Those cars are assembled in BMW’s home city of Munich, Germany, but the second-generation M4 models will be produced alongside standard 4 Series Coupé and Cabriolet variants in nearby Dingolfing.

BMW is also planning to add four-door practicality to the M4 line-up for the first time by offering a Gran Coupé version. The junior sibling of the recently introduced M8 Gran Coupé is scheduled for launch in 2022 as a rival to the Audi RS5 Sportback, according to well-placed BMW sources. They told Autocar that the popularity of the original 4 Series Gran Coupé in North America and China was behind the decision to introduce its successor to the M4 range.

The versatility of the Cluster Architecture (CLAR) platform that BMW introduced in 2017 is displayed by plans to base the i4 on the same structure as that used by its conventionally powered siblings – the first time BMW hasn’t used bespoke underpinnings for an EV.