Variable geometry turbocharger's?

[Miasma]

Anyone have any experience with these? Been doing some reading on them and they are pretty interesting. I had no idea Porsche was making cars with these in them(If they still are they came in the 07 911 turbo), Might not be too long before the aftermarket starts implementing them.





I can just imagine a M30 or any engine for that matter with one of these, Properly sized and setup of course.

http://en.wikipedia.org/wiki/Variable_geometry_turbocharger

http://paultan.org/archives/2006/08/16/how-does-variable-turbine-geometry-work/

[Devil Inc]

IIRC, the 6.7L Cummins engines use this. Please feel free to correct me if I'm wrong. Should be fun to fiddle with.

[EvoStevo]

a bunch of European diesel cars have VGT turbos (E200 CDI's and some VW/Audi TDI's). I considered attempting to fiddle with one in particular (Garrett VNT20, I think), but realized that 1. I don't know enough about turbos to mess with this and 2. that the higher EGTs and lower exhaust pressure of a gasoline engine might not be so good for a turbo designed for a diesel. I'd love to see somebody try though.

[Miasma]

Yeah that is why Porsche using one in a production gasoline engine is so significant. The one they use is liquid/oil cooled. From what I read the higher temps are what is holding them back from gasoline engines.

[Adrian_Visser]

i'm no expert on turbos but holsets are designed for diesel engines and lots of turbo swappers use holset hx35's or hx40's on m20's they work great. the variable geometry inlet guide vanes make the turbo efficient over a wider operating range, if anyhintg it seems to me that it would make the turbo more adaptable to different engines.

[mrsleeve]

^^^^^^^^^^^^^^^^^^
right it also lets you run with out a waste gate or a blow off valve as the computer will adjust the vane angles to trim out the turbine at maximum boost pressure (no waste gate) Or use the open the it way up to act as a break on the turbine to keep from over boosting during shifting. All this comes from lots of senors and PCM turbo control code, it would be a PIA to try an get to work like this on a swaped e30 unless you were gonna put a Duramax in it with a hot tune in a factory GM computer.

GM has been using VVT Garrets since mid year 2004. The LLY engine code and newer.

Mia: all turbos are oil cooled this is why you always let you turbo car idle for 5 -10 mins before shutting down after a hard run so the oil dose not sludge or turn to solids in the bearing. There are some that do have a liquid cooled center section holset has that option on many of it HX series turbos for either marine engines or huge industrial engines that are on gen sets, power packs or anything that will not move around much and will run for days, weeks, or even months at WOT with out a shut down. If you dont cool that center section with coolant it will heat soak and burn up you oil faster an wipe out the bearing and turbo in short order.

[e30this]

If you want to learn about these turbo speak with dp2275 on e30tech.
I know he is using one of these on his build and has some good info on them.

[SamE30e]

The new dodge ram's use them. I drove one back from california and you can't really tell when it spools because it's almost instant.

[StereoInstaller1]

VATN (Variable Area Turbine Nozzle) turbochargers have been around since the mid-70's.

The classic "Turbochargers" by Hugh MacInnes mentions them as a "new" technology.

Luke

[JonFreyr]

Not to mention that Inlet Guide Vanes and Variable Stator Vanes are things have been in use for a very long time in jet-motors :) not exactly a new concept like StereoInstaller1 says. Perhaps someone knows whether Turbine manufacturers have experimented with pitch alterations of the turbine-blades on the hot side....?