When the next-generation BMW M3 and M4 Coupe arrive in worldwide markets in 2020, they are going to be powered by a considerably upgraded six-cylinder engine, which will likely be able to producing greater than 500hp in its prime kind. One of many fashions that can use this uprated motor would be the new M4 Gran Coupé, marking the primary time the four-door coupe will characteristic a full-fat M variant. It is going to be joined by a two-door coupé and a cabriolet variant, together with the M3 sedan.
The three.Zero-litre twin-turbo petrol motor, which carries the inner codename S58, is a improvement of the BMW’s commonplace B58 unit that’s used within the 440i, amongst others. M division officers have revealed to our sister publication Autocar UK, “It’s for all intents and functions an all-new drivetrain with important modifications to the bottom engine that permit it to rev past 7,000rpm and ship a a lot increased particular output,” in comparison with at the moment’s S55 engine.
Together with the sixth-gen M3 sedan, the brand new M4 Coupe and M4 Gran Coupe, the brand new engine can even energy new M4 Convertible and the X3M and X4M sport SUVs. The motor can even be discovered underneath the bonnet of the second-generation M2, albeit in a decrease state of tune.
On the brand new engine, BMW’s M division engineers have managed to lift energy by greater than 11 p.c in the usual M4 and 13 p.c within the M4 Coupé Competitors, with claimed outputs of 480hp and 510hp, respectively. Torque has additionally elevated by about 50Nm, with the brand new S58 engine delivering 600Nm between 2,600rpm and 5.600rpm.
These figures will place the brand new mannequin in direct competitors with the 450hp Audi RS5 and 510hp Mercedes-Benz C 63S Coupe.
Regardless of the rise in efficiency, the S58 engine has been developed to fulfill strict new emission laws, thanks partially to the adoption of dual Otto particulate filters.
Key among the many modifications over the S55 engine is the adoption of an extended stroke, at 90mm, whereas the bore measurement stays 84mm. Nevertheless, BMW M claims the altered inner measurements assist to spice up torque potential.
Additionally included are two mono-scroll turbochargers instead of the one twin-scroll unit used on the B58 engine, in addition to BMW M’s newest Valvetronic variable valve timing and ‘Double Vanos’ variable camshaft profile. The compression ratio has additionally been lowered, from 10.2:1 for the S55 to 9.three:1.
Though the brand new engine does with out water injection, officers say it could seem on a further-developed model of the S58 unit more likely to seem in a successor to at the moment’s 460hp M4 CS.
Secrecy surrounds the remainder of the M4’s mechanical make-up. Nevertheless, insiders counsel it’s in line to desert custom by adopting an Eight-speed torque converter computerized transmission and an identical xDrive four-wheel drive system to the most recent M5 (with an M-Dynamic mode apportioning energy to the rear wheels) in no less than one model.
It’s also recommended a less expensive and lower-powered entry-level mannequin may doubtlessly be provided, with a handbook gearbox and rear-wheel drive.