The most noticeable difference will be the way the new engine delivers its power. The V10’s 500bhp comes at 7750rpm, but the V8’s peak power should arrive at not much more than 6000rpm.
More than outright power, though, it is the added torque that is likely to bring the biggest change in character. Biermann indicated there will be a 30 per cent increase, taking torque from today’s 383lb ft at 6100rpm to somewhere around 500lb ft at little more than 1500rpm. Biermann is also confident the V8’s unique induction system will provide similar levels of throttle response to today’s model.
The early prototype pictured here is one of 10 road-going mules for the new M5. It is being used to test the cooling provided by a new front end. “The development process is at an early stage. We’re concentrating on the durability and cooling of the driveline at the moment,” said Biermann.
The V8 means the M5 will require additional cooling capacity for the intercooler as well as a means of extracting hot air created by the turbochargers.
Along with the new engine, the car will also get a new gearbox, a beefed-up version of the M3’s seven-speed DCT (dual-clutch transmission), as previewed on the 25th anniversary version of the M5 unveiled last week.
Although BMW has just introduced a new petrol-electric hybrid system on its new Active Hybrid 7, it has not been considered for the M5 due to the 100kg it adds to the car’s weight.
Weight saving is playing a big part in the M5’s development, with carbonfibre being used in the bodyshell. BMW is working on a carbonfibre roof and bootlid, mainly because, being sited on top of the car, they are less vulnerable to impact damage.
At the same time, a lot of effort is going into honing the aerodynamics at BMW’s new wind tunnel in Munich. The car will get Active Aerodynamics, which blanks off parts of the grille and cooling intakes during warm-up and under light throttle load.
The new M5 will continue the car’s tradition of visual understatement with a muscular appearance. LED lighting will be used to enhance the look and differentiate the M5 from the standard 5-series, a new generation of which is due early next year.
Underneath, there will be new double wishbone front suspension in place of the MacPherson strut set-up that has been a mainstay of the M5. It will be combined with multi-link rear suspension.
As with today’s model, active dampers will be used to provide the driver with the choice of differing levels of ride comfort. They will be part of a new chassis system that also includes reworked traction and stability management.
The M5 will also get new, fully electric power steering, described by Biermann as a third-generation system that offers similar levels of response and feedback to today’s hydraulic set-up.