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Variable Geometry Turbos

southern_tango

By southern_tango,
in Engines & Forced Induction

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southern_tango Proficient

southern_tango

Posted
Posted

Just crossed my path with this in youtube

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Opinions?

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https://www.sau.com.au/forums/topic/348819-variable-geometry-turbos/
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SimonR32 Grand Master

SimonR32

Posted
Posted (edited)

Been out for a long time in non petrol applications, seems to be a good idea and Porsche are now running it in 911 turbos

http://www.porsche.com/microsite/technology/default.aspx?pool=uk&ShowSingleTechterm=PTVTG&Category=&Model=&SearchedString=&SelectedVariant=PMT911TurboAll

Edited by SimonR32
GTRNUR Grand Master

GTRNUR

Posted
Posted

They use a stepper control with an electronic controller on the porsches. There is a lot more to it than just controlling boost as well. When the engine is off boost the electronics cycle the veins back and fourth to stop them jaming up. Its safe to say the porsche versions are a fair bit different than the VGT's that are used on diesals.

Rolls Grand Master

Rolls

Posted
Posted (edited)

I have always wondered why we don't see these in the form of garret performance turbos that we can purchase. I know they do make them, but I have never seen an aftermarket one for sale.

edit: After some reading apparently the issue is they don't run a wastegate causing excessive back pressure at high revs, great for a factory car but not so great for a performance race car.

I'm sure you could adapt a wastegate with one but controlling the vayne and the wastegate to control boost would be very difficult, you couldn't just do it by trial and error, you'd need to have someone work out the maths before hand, I believe porsche is the only company that has successfully done this so far.

Edited by Rolls

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