Variable Geometry Turbo

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Variable Geometry Turbo

Postby Nikko » Sun Feb 01, 2015 5:57 pm

Hey guys,
So i've been putting a bit of research into turbo's and looking at a few options for when I most likely will change to an aftermarket turbo. I am curious if anybody has installed a variable geometry turbo? How did it go? Major issues, extra costs involved?
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Re: Variable Geometry Turbo

Postby RX25SE » Sun Feb 01, 2015 7:10 pm

Usually found on diesels. although Porsche use it on the 911.

Not sure if they are used in the aftermarket, but I assume you will need some sort of a controller to adjust the vanes based on engine speed, boost etc.
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Re: Variable Geometry Turbo

Postby Nikko » Sun Feb 01, 2015 7:15 pm

My understanding was that the vanes were controlled more by the actual exhaust flow rather than controlled electronically.
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Re: Variable Geometry Turbo

Postby RX25SE » Sun Feb 01, 2015 7:50 pm

Possibly, but all the ones I have seen have a electronic servo.
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Re: Variable Geometry Turbo

Postby HardwareBoB » Sun Feb 01, 2015 9:15 pm

The turbos are VERY expensive because you have to make them out of inconel, and the controllers are VERY expensive because it's basically a whole other ECU to control the vanes, and the installation is VERY expensive... you get the idea. I read a bit about them today, but tldr, VGT turbos are a WOFTAM on petrol engines unless it's a money no object build (I'm talking koenigsegg level here)
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Re: Variable Geometry Turbo

Postby bigBADbenny » Sun Feb 01, 2015 10:56 pm

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Re: Variable Geometry Turbo

Postby Robbks » Mon Feb 02, 2015 9:45 am

Now I need to learn how these VGT things actually work...
incoming Diesel
coyote wrote:Sure, a GTR is fast ... but it's about as interesting as listening to grass grow.
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Re: Variable Geometry Turbo

Postby bigBADbenny » Mon Feb 02, 2015 1:19 pm

Glad to see the replacement is still a suby, Rob :)
GLWYS ;)
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Re: Variable Geometry Turbo

Postby Nikko » Mon Feb 02, 2015 3:58 pm

I'm looking at dream builds for my Liberty TBSTI at the moment :) would of loved to do a VGT but maybe it's not viable then haha. On to other things it is haha.
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Re: Variable Geometry Turbo

Postby Nikko » Wed Feb 04, 2015 8:23 am

So what about twin scroll? Surely this has been done on the liberty's sometime?
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Re: Variable Geometry Turbo

Postby HardwareBoB » Wed Feb 04, 2015 8:45 am

Pre face lift came with twin scroll from the factory, twin scroll on any lib is easy, get twin scroll headers+up pipe, twin scroll turbo, make sure the dump matches and away you go.
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Re: Variable Geometry Turbo

Postby Nikko » Wed Feb 04, 2015 8:56 am

Thought that would be the case. Might put a bit more research into this though I suppose there is also that when you get to a decent size turbo the engine is more limiting then isn't it?
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