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Originally Posted by moodyhank82

Why?

"While the B58 uses a single twin-scroll turbocharger to pressurize the intake manifold and drive charge air, the S58 employs twin individual mono-scroll units"

https://bimmerlife.com/2019/02/16/bm...ix-powerhouse/

Using the word “variable” implies the turbo changes something during its usage.

There is one type of variable turbo, and Porsche uses it. It’s called variable geometry, so it varies the size of the impeller depending on load and RPM, either to give better response, or more flow (low/top end).

There is turbo technology to vary a twinport to a single port depending on load and RPM as well. As far as I know this technology is not employed in any gas engine.

BMW uses a single port turbo for the S58 (and employs 2 of them), and a twinport turbo for the B58 (and employs 1 of them).

They have nothing variable about them. Saying a turbo is “variable scroll”, to me, sounds like variable geometry. I didn’t watch the video to see what else he doesn’t know but is saying out loud because no one cares.

Your link doesn’t talk about variability.