BMW has unveiled two new turbocharged straight-six engines that it expects to gradually replace V8 engines for most of its customers. It has also launched a new eight-speed automatic transmission, which also promises improved economy.
The 3.0-litre petrol petrol unit is dubbed the TwinPower turbo and is the first BMW unit to combine the familiar Valvetronic variable valve management (although the system has been newly downsized) with high-pressure fuel injection and turbocharging.
Using a single, twin-scroll, turbocharger, the new engine develops 302bhp and 295lb ft of torque, which it can deliver from just 1200rpm and then all the way to 5000rpm. BMW says this kind of torque delivery emulates the feel of a much larger V8 engine.
Despite this, the new petrol engine is good for just 209g/km of Co2 and 26.4mpg. BMW says when this unit is fitted to the new 5-series GT (badged as the 535i) it will hit 62mph in just 6.3 seconds.