The BMW TwinPower Turbo know-how relies on the twin-scroll precept and has been actively put in in BMW petrol and diesel engines since 2011.
The know-how at a look
The progressive turbocharging know-how additionally gave the greenlight for downsizing at BMW. Due to TwinPower Turbo, a number of the previous 6-cylinder engines within the lineup have been changed with 4-cylinder models that had been superior when it comes to effectivity, response and pulling energy.
The BMW TwinPower Turbo has many advantages, because it permits for extra variability throughout the engine vary and likewise helps enhance gas consumption, while additionally lowering the CO2 emissions because of the improved, efficient gasoline recirculation course of.
In fact, as to realize most productiveness, TwinPower Turbo works together with the Excessive Precision Injection, the Double VANOS variable camshaft management and VALVETRONIC variable valve management.
The very first software of BMW TwinPower Turbo got here in 2011, when the constructor launched the brand new BMW X1 xDrive28i variant, that used a newly developed 4-cylinder petrol engine changing the outdated 3.0-liter, straight-six, naturally aspirated powerplant.
The previous 6-cylinder N52B30 unit, that beforehand powered the X1 xDrive28i (2009 – 2010) and delivered 180 kW / 245 PS (241 hp), was despatched into pasture by the state-of-the-art, turbocharged N20B20 unit with I4 structure and rated on the identical most output of 180 kW / 245 PS (241 hp).
The brand new N20 powerplant developed a peak output of 350 Nm, out there as early as 1,250 rpm. On the identical time, the 0-100 km/h acceleration was improved by as much as 0.Three seconds in comparison with the previous model, reaching 6.5 seconds. Moreover, because of the BMW EfficientDynamics measures and the TwinPower Turbo know-how, the typical gas consumption dropped by 1.5 liters to 7.9 l/100 km, in comparison with the naturally-aspirated I6 engine.
Alongside the brand new 4-cylinder petrol engine, BMW additionally premiered a 6-cylinder diesel engine full with TwinPower Turbo in 2011. The brand new 3.0-liter I6 diesel powerplant, titled N57D30O1, got here up with an elevated output (190 kW / 258 PS) and boasted additional optimization within the areas of diminished inside frictions, weight and gas injection.
The up to date N57 powerplant featured a high-precision, Widespread Rail diesel injection at a strain of 1,800 bar. The acquire in torque was of 20 Nm to 560 Nm over the previous engine, already out there from 1,500 rpm.
Moreover, the turbocharger was outfitted with variable consumption geometry, alongside a discount within the turbine wheel. Within the F10 530d xDrive, the acceleration from 0-100 km/h took simply 6.1 seconds, whereas the typical gas consumption to five.7 l/100 km.
BMW TwinPower Turbo: It’s all within the title
As evoked within the first paragraph, BMW developed its trailblazing TwinPower Turbo know-how on the idea of the twin-scroll precept. So, mainly, the title says all of it, however though intuitive, it’s not that straight-forward to many.
To start with, one of many widespread errors is that many consider twin turbo equals biturbo, which is fake usually, regardless that each depend on two turbochargers. One other misbelief is that TwinPower Turbo really denotes a twin turbo configuration, which actually is just not the case.
So, to make clear, let’s begin from the next definitions:
- twin turbo know-how employs two turbochargers which are positioned one subsequent to the opposite (“twin”)
- biturbo employs 2 turbochargers as properly, but they’re situated one on both sides of the cylinder financial institution (typical for V8 engines)
- BMW TwinPower Turbo is counting on a single turbocharger with two scrolls
- BMW TwinTurbo Energy (sure, this one exists too) depends on two turbochargers
- TwinPower Turbo is just not the identical as TwinTurbo Energy, so don’t combine them up
Sounds straightforward, huh? It partly is. The TwinPower Turbo know-how from BMW includes what’s known as a divided inlet turbine and a properly-designed exhaust manifold. The latter element is of essential necessary, as a result of it helps pair the cylinders accurately as to correctly direct the circulate of exhaust gasoline independently on one scroll.
As chances are you’ll recall, the TwinPower Turbo is at present fitted to both 4-cylinder and 6-cylinder BMW engines, no matter the operating gas (diesel or petrol). In inline0four functions, cylinders that fireside 1st and third are teamed up on one scroll, whereas, cylinders that fireside 2nd and 4th within the sequence are paired on the second scroll.
In case of the inline-six powerplants, the mix order is usually 1-3-5 on one scroll, 2-4-6 on the opposite scroll. In what BMW V8 models are involved (the N63/S63 technology), the necessity for extra energy led to the adoption of dual turbo, so 2 turbochargers positioned collectively, given the recent internal V structure (with the turbochargers positioned between the cylinder banks). And sure, the turbocharging know-how within the 8-cylinder powerplant is known as BMW TwinTurbo Energy, though not visibly labeled.
Shifting on to TwinPower Turbo which depends on the twin-scroll precept, in comparison with single-scroll turbochargers, the advantages are substantial within the following respects:
- a correct and faster increase response, given the balanced pairing of cylinders based mostly on firing order
- sustained, uninterrupted energy supply in any respect engine velocity, based mostly on fixed recirculation of exhaust gases via the twin-scroll
- maximized pulse power feeding the turbocharger wheel
- improve of operating effectivity and lifetime of the turbocharging unit
- important discount in turbo lag and gas consumption
- improved low-end energy supply, just like twin turbo engines
- notable enchancment in lowering pumping losses
To maximise the advantages of BMW TwinPower Turbo, a number of different elements have been developed as to extend the stability and smoothness within the engine functioning. The vertically offset balancing shafts optimally compensate the vibration, whereas the centrifugal drive pendulum built-in within the dual-mass flywheel acts to stop any irregular engine rotations which are inclined to look at low rpm.