BMW BLENDS TURBOS INTO A 4,6 SECOND FUN RUN
BMW HAS announced its TwinPower Turbo technology, which features not two but four turbochargers and the latest tech in common-rail direct injection.
This multi-stage turbocharging system was engineered for the BMW 750d xDrive and BMW 750Ld xDrive, and makes 294 kW and 760 Newton metres to qualify as the world’s most powerful six-cylinder diesel engine.
Yet, BMW also claim fantastic fuel consumption — a combined use of as low as 5,7 l/100 km — and very low CO2 emissions of between 154 and 149 g/km.
Bearing in mind the ongoing VW and Mitsubishi emission scandals, BWM would have been very careful to have verified these figures.
BMW also claims acceleration from zero to 100 km/h in 4,6 seconds for the heavy 750d xDrive, a claim which every petrolhead is sure to test.
BMW’s engineers said in a statement this “get up and go” is due to a new form of multi-stage turbocharging, “which now brings together four turbochargers to enable boost pressure to be built up even more quickly at lower engine speeds and therefore prompts swift responses to throttle applications from idle”.
In normal driving, the two low-pressure turbochargers and one of the two high-pressure turbos are permanently in action.
Only under hard acceleration from idle will the two low-pressure turbochargers be bypassed by means of a flap control system. This allows boost pressure to be built up even more quickly. The second high-pressure turbocharger is brought into play at an engine speed of about 2 500 rpm.
Another new feature is exhaust gas recirculation for the low-pressure stage of the turbocharging system as well as the high-pressure stage.
This increases the effectiveness of the turbochargers and of the engine as a whole.
The BMW 750d xDrive — the most powerful sixcylinder diesel — will be on sale from July 2016.