GTSpirit test drives and compares the M6 twins: BMW M6 Coupe and M6 Convertible. Compared to the previous E63/E63 M6, the new F12 and F13 models have slightly grown in size. The F13 Coupe now measures 4,898 mm in length, 1,899mm in width and 1,374 mm in height compared to 4,871 mm, 1,855mm and 1,372 mm for the previous model.
Both super Ms are powered by the S63Tu engine, a 4.4-liter unit with an output of 560 hp (412 kW) at 5,750 – 7,000 rpm, and maximum torque of 500 lb-ft (680 Nm) on tap between 1,500 and 5,750 rpm. The rev limiter intervenes at 7,200 rpm.
The engine is mated to a 7-Speed M-Double Clutch Transmission and an innovative Active M Differential.
But how do they compare on the road?
We had both cars for twenty four hours on our favorite local European roads, having also been fortunate enough to obtain access to both current members in the third generation M6 family; the Coupe and Convertible. Both share the exact same powerplant, drivetrain, suspension, and body modifications, but differ with respect to their presence. The Convertible is more of a luxury four-seater – the equivalent of automotive jewellery, while the closed version will probably appeal more to those that buy it for the experience. Although that isn’t to say the two are mutually exclusive!
On the subject of technical highlights there is not a lot between both M6 models. The single test enabled us to compare the duo with a surprising result. The handling of both Coupe and Convertible is almost identical, with the extra weight of 130kg in the cabriolet being no penalty at all. While both are similar in a straight line, the dissimilarity starts at the rigidity of the body work.
The removal of the canvas roof on the Convertible opens a different world in which the cabriolet tends to absorb dips, grooves and seams in the road, a lot better than the Coupe does. With the roof up the Convertible feels like a different car. It becomes almost as rigid as the Coupe and provides more road feedback to the driver. The differences were most noticeable when you opt for the Sport Plus settings in the Drive Dynamic Control system. The amazingly supple and compliant comfort mode changes to a quite firm and totally planted set up. Simply removing the well-insulated cloth roof brings back most of the suppleness, which we found to be a rather intriguing behavior, not favorable of the F13M’s rigidity.