Official Thread BMW unveils new-generation engine line up

[anti-VAG]

Nope. To the best of my recollection BMW has not yet implemented variable vane geometry in its turbochargers. BMW turbocharging goes under the ubiquitous banner of BMW Twin-Power Turbo which is misleading. BMW engines can be:
Single-scroll, single turbo - eg 320d, 330d
Twin-scroll, single turbo - eg 330i, 340i
Single-scroll, bi turbo - eg M3, M4
Twin-scroll, bi turbo - eg. M5
Two-stage, sequential, bi turbo - 35d, 40d
Tri-stage, sequential, tri turbo - 50d (outgoing)
Two-stage, sequential, quad turbo - 50d (incoming)

VGT is normal on single turbo diesel engines. BMW is no different.

VGT has problems on gasoline due to high exhaust temperatures. Thus BMW there is using the next best solution. A twin-scroll turbo which BTW does not make sense od diesel.
Of-course on single turbo 3 cylinder engines or 6 cylinder with two parallel turbos twin scroll does not make sense.

But... AFAIK in the future for Euro 6d diesels BMW will offer non single turbo diesel engine. All will be twin turbo. That's their way to comply future RDE tests.

 

[Giannis]

VGT has problems on gasoline due to high exhaust temperatures.

Exhaust gas temperature is between 820 - 850C for diesel and between 950 - 1050C for gas engines.

 

[CrunchSlaughtered]

But

Exhaust gas temperature is between 820 - 850C for diesel and between 950 - 1050C for gas engines.

The diesel has much more tar in the exhaust, which clogs the moving vanes of the VTG and they stop to operate further only after about 100k km

 

[Giannis]

But

The diesel has much more tar in the exhaust, which clogs the moving vanes of the VTG and they stop to operate further only after about 100k km

Older turbodiesel engines used to have a soot trap before the turbocharger, but with stricter emission regulation nowadays, both the EGR and soot trap are after the turbo. Therefore, what you say is correct.

 

[chonkoa]

Exhaust gas temperature is between 820 - 850C for diesel and between 950 - 1050C for gas engines.

And that temperature is further amplified when the exhaust gas is not allowed to expand freely but made to do mechanical work ie compressing air.

 

[Tapsa70]

Smaller four cylinder diesels will get the first update buth without power increase.

Four-cylinder BMW diesels to get their first big update

 

[jakebarrell]

Whow! This is great news! I can't wait for BMW to make their next announcement on this!