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Garrett Variable Nozzle Turbines

caminperth
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caminperth Grand Master

caminperth

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Has anyone on this forum got any experience in Garrett VNT turbos? Is anyone running them? Looks like the perfect way to match a turbine to engine speed/load.

http://turbotech.com.au/garrett4.htm

http://www.honeywell.com/sites/ts/tt/turbo...ts_VNTworks.htm

http://www.honeywell.com/sites/ts/tt/Passe...12155701757.htm

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discopotato03 Grand Master

discopotato03

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VATN or variable area turbine nozzle technology has been around for a while mainly used with Diesels . The housings and vanes are expensive to produce (high temp materials expensive) and the higher exhaust gas temperatures of petrol engines cause reliability problems .

The theory is that a variable area radius ratio will give less turbine inlet pressure in relation to boost pressure so there is less restriction to gas flow through the engine .

An American firm Aerocharger did market them for a while but they seem to have disappeared . Corky Bell talks about them , and a lot of forced induction theory , in his book Maximum Boost . I'd really like to see an update to his book with todays more modern turbos etc .

Cheers A .

caminperth Grand Master

caminperth

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I've read that book by Corky Bell. It's not bad, but as you said, would be alot better with current technologies written into it.

I'm currently reading "Turbochargers" by Hugh MacInnes. It's a pretty good technical book on matching turbines, housings, compressors ect. I'd definitely recommend it.

Shame the VNT turbos aren't used a little more. I'm also a little surprised as Garrett seem to offer this on their GT series turbos. I'm defintiely going to look into it as it seems like such a good solution if serviced properly to provide the reliability required.

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