Disclaimer - I know not much about the control and workings of a turbo and have been drinking for a few hours

Ok so we've all heard about the variable vane turbos in all these new common rail deisel utes. I was having a look inside one of them the other day and checking out how they work. Got to thinking . . . if an external gate manifold was used then why not a variable vane turbo on a falcon. Do they make big ones, about the size of a gt47 or even bigger or only the smaller sizes?

Someone tell me why it wouldn't work or hasn't been done

exhaust temps, diesel runs lower temps and the workings of the vgt are sensitive to heat, but I think in time it will be something that's probaly pretty common as tech advances....

Doesnt porsche use them in some of there cars? I sware I read about it some were. Ill go hunting and see if I can remember were I seen it.

Ta Da!!!

Porsche Technology Glossary

Also garret make VGT's so maby look on there site?

I thought one of the subies had one in it, or maybe that's twin scroll cant remember. Biggest thing is the price of the technology, imagine replacement cost if for some reason ya busted it. Or the cost of the comp that probably runs the variable vanes.

Wenier - I can't see the cost being anymore than a turbo with an internal wastgate. The technology is simple as, it's a mechanical linkage operated by a pilot operated actuator with a spring return. Which just happens to be exactly what an internal wastegate is driven by. No need for fancy electronic porche gear just change the spring inside the actuator and/or put in a jap style boost controller on the pilot line to control when the vanes start to move.

Whats the benefit?

Edited 10/06/10 10:33 PM10/06/10 10:33 PM by seduced

It's a turbo that kinda grows as the rews and load go up, like having a small turbo for low rews and a big one for up high. So in a falcon you could have your lag free FG response and BA high power capability...

Guys, Variable Vane Turbos and one thing Varibale Nozzle Turbo's are another.

VVT are incredibly expensive. They work buy altering the angle of the vane on the comp wheel to increase/decrease air flow/mass. I know there are cars out there that use them (isuzu diesel's i think )

Variable Nozzle Tubro alter the AR ratio of the exhaust housing,

The porsche in the link above is VNT

VNT could be doable on a ba/bf (dunno bout FG) the output from the PCM that is normally used on NA cars to control the Variable intake runners could be used to control the VNT actuator.

I would love to set up a VNT turbo on my ba but i dont know how the driveline would handle it!

ok here's the one I was talking about, cutaway of exhaust housing

The actuator and linkage

Vanes fully open

Vanes fully closed