Franglais:
newmercman:
Yes it could, the hot and cold sides of the turbo have different sized turbines and housings, in simple terms they’re like the drive train on a push bike, a bigger turbine on the hot side and a smaller one on the cold side, the VGT is basically a Derailleur, as the pitch changes it increases or decreases pressure.Sent from my SM-G950W using Tapatalk
Yep.
You’re right if course.
A turbo could compress a smaller volume of air to a higher pressure. And the exhaust from an engine really is always more than the air intake.
The exhaust gas speeds up as it flows through the turbine so its pressure falls, it gives up energy in driving the turbine. As explained above the advantage of a VGT over a wastegated unit is that changing the ‘effective size’ of the turbo to make best use of the exhaust volume is more thermally efficient than just dumping excess gas through a wastegate. An efficient VGT should ‘match’ the engine over a wider range of rpm/accelerator settings.