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Old 09-11-2005, 07:42 PM   #1
silentbob343
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Default Variable Geometry turbo?

I was just watching a 4x4 show on spike TV and they were replacing the stock turbo on a Dodge truck and one of the unique features of the new turbo was its variable geometry. The center section is controlled to open or close a series of vanes that allow the turbo to spool faster down low and open up for power.

Has anybody heard of this on a car turbo?
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Old 09-11-2005, 08:22 PM   #2
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Seen that episode last year.

Never heard of any cars with one though.
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Old 09-11-2005, 08:23 PM   #3
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Yes its called VNT, Variable Nozzle Turbine and it was used on Chrysler CSX Shelby's back in the day.
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Old 09-11-2005, 08:34 PM   #4
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yeah spike had an extreme 4x4 day I caught the last three episodes. If it's not a new technology then there must be a negative to it. Of course the guy who created the unit didn't mention any downsides only the plus sides.
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Old 09-11-2005, 08:42 PM   #5
Master2192
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I was going to buy a VVT turbo from work, because they've got them on the 5 Cylinder 2.7L Mercedes Diesel in the Freightliner/Dodge Sprinter vans. But i kind of threw that idea out. The reason they haven't used them on gasoline engines is because of the extreme heat. Diesels exhaust is much cooler so they can restrict the gases to spin the turbo (with the right ammount of the throttle in the sprinters, i could get full boost at 1200 rpms) But in a gasoline engine this would melt the turbo.
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Old 09-11-2005, 09:03 PM   #6
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speaking of heat

The new intercooler they installed with it was the size of the radiator, the old one was also large. It was mounted right in front of the radiator as well, which I found odd as that is a large obstruction to airflow for anything behind it. He claimed with the larger intercooler and larger exhaust, 4.5", the EGTs would stay at stock levels.
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Old 09-11-2005, 09:33 PM   #7
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i have a friend with a duramax truck, and his EGTs are WAY higher than mine ever were in my WRX. he peggs the gauge at 1500 all the time.

kenshiro has used a vnt turbo on his bugeye for a while now AFAIK and ive never heard much about it. that might mean that it went well for him, it might mean it didnt.



go to www.baldturbofreak.com for the install pics.
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Old 09-12-2005, 07:12 AM   #8
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Nice, I wonder how it went.

Also....you'd need some kind of Turbo Management computer too to make it work correctly. Unless there is some sort of mech. way to run it.

I would think it would have to know a few variables to calculate the correct vane movements no?
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