Rivalling the likes of the Bentley Continental GT at a price of around £120,000 in the UK, the new four-wheel drive model has now entered a final phase development ahead of a planned public debut at the Frankfurt motor show next September.
Set to crown the newly-resurrected 8-Series line-up, the M8 will be sold with the choice of three different bodystyles. The first to reach UK showrooms will be the M8 coupe, pictured here testing at the Estoril circuit in Portugal earlier this month. It will be followed by the M8 convertible that is set for launch during the latter half of 2019, with a four-door M8 GranCoupe also confirmed for launch during the first half of 2020.
The M8 is powered by the same V8 petrol engine as the M5, and as with its four-door sibling, the longitudinally mounted twin-turbocharged 4.4-litre unit is planned to be offered in two different states of tune.
In standard M8 guise, the 90-degree engine will be tuned to deliver more than 600bhp, according to BMW M development boss Dirk Häcker. Although not yet confirmed, a more powerful M8 Competition is also planned, offering up to 650bhp through various tweaks to its induction system.
BMW has not divulged any official performance figures, but Häcker suggests the M8 will significantly undercut the current flagship M850i xDrive’s claimed 0-62mph time of 3.7sec. Combined fuel economy is put at 26.4mpg at this stage in the development process.
In a move mirroring that of the latest M5 and M850i xDrive, the M8 receives a standard eight-speed torque converter automatic gearbox as well as a variable four-wheel drive system and electronically controlled M-differential at the rear. A so-called M Dynamic mode allows the driver to activate a rear-wheel drive mode, too.
Similarly, the suspension is a development of the double wishbone and multi-link system used by the M5. However, the M8 boasts a shorter wheelbase and wider tracks than its sedan sibling. Additional body stiffening increases its rigidity over the M850i.