VFT (variable flow turbo)???
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Joined: 09-12-09
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From: USA
same but different, here's a little something on the subject
FROM: http://www.autoblog.com/2006/03/01/g...che-911-turbo/
Porsche's variable turbine geometry (VTG) setup on the 2007 911 Turbo was developed in close cooperation with Borg Warner Turbo Systems, and is based on technology which has been widely and successfully applied to diesel engines since the early 1990s. It is nearly identical in concept to other turbo manufacturers' variable nozzle/geometry compressors, including a system that was briefly used on a series gasoline production engine in the late 1980s. This application encountered difficulties due to high operating temperatures -- a problem not easily solved with contemporary materials -- and production was stopped after a limited run.
After nearly two decades, aerospace-grade materials have allowed the progression of variable-geometry turbo technology to the point that it can now reliably operate in the higher-temperature environment of turbocharged gasoline engines. Porsche's version of variable turbine geometry in the 2007 911 Turbo incorporates these latest material applications, plus a sophisticated control algorithm. The combination produces the advantages of both small and large turbochargers, generating a much wider plateau of torque and providing quicker response compared to the previous generation 911 Turbo, while providing the reliability of fixed-vane turbochargers.
FROM: http://www.autoblog.com/2006/03/01/g...che-911-turbo/
Porsche's variable turbine geometry (VTG) setup on the 2007 911 Turbo was developed in close cooperation with Borg Warner Turbo Systems, and is based on technology which has been widely and successfully applied to diesel engines since the early 1990s. It is nearly identical in concept to other turbo manufacturers' variable nozzle/geometry compressors, including a system that was briefly used on a series gasoline production engine in the late 1980s. This application encountered difficulties due to high operating temperatures -- a problem not easily solved with contemporary materials -- and production was stopped after a limited run.
After nearly two decades, aerospace-grade materials have allowed the progression of variable-geometry turbo technology to the point that it can now reliably operate in the higher-temperature environment of turbocharged gasoline engines. Porsche's version of variable turbine geometry in the 2007 911 Turbo incorporates these latest material applications, plus a sophisticated control algorithm. The combination produces the advantages of both small and large turbochargers, generating a much wider plateau of torque and providing quicker response compared to the previous generation 911 Turbo, while providing the reliability of fixed-vane turbochargers.
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Joined: 01-01-09
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From: michigan
lots of drag snowmobiles run these. they carbon up alot and the vanes stick. you can watch a video on them. they are EXTREMELY efficient and provie instant boost response with high flow capabilities.
also known as variable vane turbo
also known as variable vane turbo
Last edited by jrocstar; Oct 29, 2009 at 01:23 PM. Reason: Automerged Doublepost
I dont have experience with them on performance vehicle but on the diesels they are computer controlled. The computer basically opens and closes vanes that form the side of the turbine housing, when closed it makes full boost, the more you open the vanes the less exhaust is used to spin the wheel.
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Joined: 08-28-08
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From: Sunshine State
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