Under the hood
Powered by the same 317kW/550Nm turbo in-line six mated to either a six-speed manual or seven-speed M Double Clutch transmission. That means that this drop top performance machine can go from 0-100 km/h in 4.6 seconds (4.4 with M DCT) and continues to an electronically limited top speed in excess of 250 km/h
The M4 Convertible is around 60kg lighter than the outgoing M3 Convertible, with a kerb weight of 1 750kg. This is possible with the use of aluminum for the bonnet, front wings and many of the chassis components, while carbon-fibre reinforced plastic (CFRP) is used for the propeller shaft and strut brace in the engine compartment.
There are special aerodynamic touches such as a specially shaped front apron, smooth underbody and Aero curtains to achieve the downforce required of a high-performance car. In manual form the new model is capable of 9.1 litres/100km with CO2 emissions of 213g/km, while the seven-speed M Double Clutch Transmission these improve to 8.7 litres/100km and 203g/km CO2.
The convertible makes use of a double-joint spring strut suspension at the front and the aluminium five-link axle at the rear. A standard feature is an electronically controlled multi-plate limited slip differential linked to the DSC (Dynamic Stability Control)
A variable electro-mechanical rack and pinion steering system with the integrated M Servotronic system moderates the degree of assistance according to speed. Both the steering, suspension and engine response can be tuned by selecting between Comfort, Sport and Sport+.
The wheelbase and width have been increased compared with the M3 Convertible, while it retains the powerdome in the bonnet. There are also standard 19-inch M double-spoke light alloy wheels, flared front and rear wheel arches, M side gills and Air Breathers behind the front wheels and polished slanting quad exhaust tailpipes.
The three-part metal roof now with a neck warming air collar provides improved noise insulation as a result of a new headlining, which also contributes towards higher levels of winter warmth and comfort. Thanks to clever design work, the M4’s looks have not been compromised by bulky roll-over protection.
The roll-over hoops for the two rear seats are now neatly hidden behind the headrests. The luggage capacity has also increased to 370 litres when the roof is closed and 220 litres when it is stowed.
At R1 194 541 for the six-speed manual and R 1 242 015 for the M DCT, the M4 Convertible is certainly not cheap but should appeal to the open top motoring enthusiast when it goes on sale late this year.