raIDERspeed

Introducing the new model, Porsche will be presenting the world's first turbocharged gasoline engine with variable turbine geometry

hmm I wanna see this up close.


http://www.autoblog.com/entry/1234000257069829/

Mr Powell

iTrader: (1)

omg... It should really make for a bad *** all around turbo setup.

braap

iTrader: (4)

Variable turbines have been around for a while...I believe Aerocharger is one company's name who produces them. Only apps I've seen them used on were bikes...and Corky Bell put one on a Miata in his famous (at least to us car nuts) book. The only problem I see with them is reliability. Just seems like a whole lot of moving parts with little in return. Motorcyclist magazine put one on a CBR900 a few years ago...turbo took a crap and needed to be replaced after a couple of days.

JZ 97 SS 1500

iTrader: (2)

Yes VNT units have been out for years. Garrett had recalls on them last year, and the performance gain vs complexity is not even worth bothering with.

Jose

JIMMYZZ28

I believe Banks also sells these in some of their kits.

stevieturbo

VW/Audi have been using them on diesel applications for years now, and they work pretty damn well !!!

thedieselkid

The 6.0 powerstroke has had a variable geometry turbo since 03, and with a 4 inch down pipe and a chip, that will probably be the meanest sounding spool up you will ever hear. The duramax also uses a variable geometry turbo as well. I have a buddy with a 6.0 and it spools to 42 pounds of boost almost instantly. Those turbos spool super fast and they sound mean as hell too.

JZ 97 SS 1500

iTrader: (2)

We tried them in the past and they worked with little to no benefit. A properly matched unit gave us almost duplicate results and had more power to grow over the current VNT turbos. Stick with a standard properly matched unit....you will thank me later.

Jose

Ferocity02

iTrader: (60)

Banks turbos' use fins in the inside of housing to decrease the diameter of the exhaust flow path for faster spooling. They don't have anything out that actually continually adjusts the pitch of the turbine fins.

JETmn

The Dodge Daytona had a VNT turbo on it back in the early 90's. I have also seen experiments with VNT turbo's vs. regular turbos and the results were like Jose said, very similar. In the future the technology may get better, but right now I don't want any extra things to break in my turbo.

JIMMYZZ28

1990
Also available was a new turbo 2.2 type IV variable nozzle turbo (VNT) intercooled engine pumping out 174 HP. Zero - Sixty times were just over 7 seconds. The VNT was developed to reduce turbo lag problems. This engine was later dropped by Chrysler, who cited turbo problems (although history has shown they were not a major problem with consumers). The VNTs are a rare find. I don't have exact production figures, but very few were produced. This engine also included balanced shafts and was offered with the manual transmision only.
http://www.allpar.com/model/daytona.html

magius231

iTrader: (8)

1990 was a long time ago though...technology has made giant leaps since then. I'd say wait a year and see how the porsche version does, then see if any turbo manufacturers pick up the ball on that one before making any judgements.

chuntington101

turbocharging is coming back in in a big way over here in Europe! even BMW who have not turbo'd and petrol engine for years are now going to be using it! also Merc are into it in a big way!

i think the major reason for its sucsses over here is the diesel market! there have been big sums of money invested into deisel tech. and one part of that is the turbos they use! its only time before petrol engine start using the same tech.

thanks Chris.

JIMMYZZ28

We are running out of fuel because we are reaching for means to use every drop as best as possible...............

transam1998

iTrader: (5)

Dodge made some cars, Daytonas I believe, with VNT turbos. They were really small, though so anyone looking to make power simply removed them and put Turbo2 turbos on the.

glennhl

I have an interesting article by a person that put a VNT on a 2000 cc ford engine in a sand rail a while ago. He was a Garrett engineer and he instrumented the heck out of the rail and did some testing. You are right, you will not make more power with a VNT, but you will get full boost in under a second versus 3 seconds when you stomp on it. This is not as important on a drag car, but very important on a road race car.

The engineer wrote an SAE paper number 880121 titled "Variable Nozzle Turbochargers for Passenger Car Applications."

MrDude_1

iTrader: (4)

holset makes a shitload of VG turbos... the Cummings plant has been testing them for years... *shrug*

and that car is FAR from the first gas car with a VG turbo... it may be the first PRODUCTION car with it, but not the first car....