Variable Turbine Geometry

[geno8r]

http://www.autoblog.com/2005/11/27/next-91...rbine-geometry/

http://digg.com/tech_news/Porsche_s_new_tu...ogy_for_the_911

Next 911 Turbo to feature Variable Turbine Geometry

November 16 of this year marked the day a century ago that Dr. Alfred Buchi received the first patent for an exhaust gas turbocharger. Porsche will be celebrating the turbo's 100-year anniversary a little late when it introduces the next 911 Turbo sometime next year with Variable Turbine Geometry. This technology allows the angle of the compressor's turbine blades to continually adjust. While some diesel engines have enjoyed this technology since the Nineties, the higher exhaust gas temperatures created by gasoline engines necessitated the creation of new heat-resistant materials to handle the hotness. Porsche and Borg Warner Turbo Systems were able to overcome the heat issue and have developed a VTG turbo system that will be incorporated into the next 911 Turbo. The VTG turbo will allow Porsche's flat-six to mimic a twin-turbo setup with a much broader torque curve and more flexible powerband than a standard single turbo could provide on its own. Power ratings for the new VTG turbo engine haven't been released and probably won't be until the new 911 Turbo surfaces sometime next year.

I'd love to see a working diagram of one of these turbos in more detail.

[IMACUL8]

Been put on a GTR now to it seems....

http://www.gtr.co.uk/forum/upload/showthread.php?t=58428

[xRHETTx]

Just the thing for my rb20... needs all the help it can get down low.

Mark 1 up to the materials engineers.

[dangerous_daveo]

That car is nearing perfection now. I want one sooo bad.

[Ronin 09]

don't forget though, this won't solve all our issues.

low comp ratios means you'll never get that NA response, no matter Variable Turbine Geom or not...

[scathing]

I'd love to see a working diagram of one of these turbos in more detail.

Your wish is my command.

http://www.porsche.com/all/masterwerk/flas...&height=513

Click Masterwerk once the Flash demo has finished loading.

Then under Act One click Variable Turbine Geometry.

[scathing]

I thought the new 997 Turbo was running twin VTG's. Its only a single?

While I realise that using a VTG system can mimic a twin-turbo setup with a much broader torque curve and more flexible powerband than a standard single turbo could provide on its own....it begs the question, why not just run twin turbos? Occams Razor, etc......

On any V engine (and a boxer engine especially), you hit plumbing problems with a single turbo. What's the benefit of going back to a single turbine rather than running a pair of turbines?

Imagine this engine with a pair of VTG turbos?

[kralster]

They are twin turbo.

[geno8r]

Your wish is my command.

http://www.porsche.com/all/masterwerk/flas...&height=513

Owww wow, that's how they work. Awesome.

Thanks for the link.

& yes, they have 2 of those suckers in the new 911.

[INASNT]

New variable twin turbo 911 was tested on last episode of 5th gear.

[scathing]

They are twin turbo.

I thought so.

So Porsche have a twin turbo engine where each single turbo mimics a twin turbo. So does that mean its a virtual quad turbo?

[scathing]

New variable twin turbo 911 was tested on last episode of 5th gear.

http://www.youtube.com/watch?v=wqcodsuXGHc

[geno8r]

New variable twin turbo 911 was tested on last episode of 5th gear.

yeah that's how i come across it & searched up the technology

here's the torrent for all

http://www.mininova.org/tor/375810

Edited July 28, 2006 by geno8r

[sh@un]

It's not the turbine blades that move on VNT turbos, it's the blades around the edge of the turbine that direct the exhaust gas on to it. It'd be impossible to do it the other way around.

[TokyoTaxi]

It's not the turbine blades that move on VNT turbos, it's the blades around the edge of the turbine that direct the exhaust gas on to it. It'd be impossible to do it the other way around.

Correct. In commercial aircraft engines they are called Nozzle Guide Vanes ( NGV's ) in the turbine or Variable Inlet Guide Vanes ( VIGV's ) in the Compressor. They change the angle of attack of the air going into the blades ( vanes in the case of turbo's ). Keeping in mind that in aircraft engines, the geometry of the turbine is not variable because of reliability and cost.

I'll be very interested to see how this goes into the future !!

The engine is going to need to run VERY cleanly to stop the guide vanes from siezing up with carbon build-up and I would imagine that the turbo service life on the new 911 would probably be an overhaul at something like 60,000km intervals.

[sh@un]

The engine is going to need to run VERY cleanly to stop the guide vanes from siezing up with carbon build-up and I would imagine that the turbo service life on the new 911 would probably be an overhaul at something like 60,000km intervals.

Latest article I read, Porsche quotes 161,000km (100,00miles) for replacement or complete overhaul of the turbos :

[TokyoTaxi]

Latest article I read, Porsche quotes 161,000km (100,00miles) for replacement or complete overhaul of the turbos :

I'd be extremely impressed if they can hold to that !!! ( and maintain full operating efficiency ).

[INASNT]

Guide vanes have been used on the hydro turbines my company does for years also.

We mainly the guide vanes to control the speed of the turbine wheel inside.

[Warpspeed]

These Garret VNT turbos have been around for about twenty years, nothing really new here.

They are not really suitable for petrol engines which is why Garret are pushing their GT ball bearing turbos for performance petrol engines, and the VNT turbos only for diesel engines. If these things worked as well as people think they do, companies like HKS would be offering them.

I ran a Garret VNT turbo on my Ford Laser for around two years so I can speak from plenty of practical experience.

You can order one from any Nissan dealer, part number is 14411-VC100 (charger assy-turbo). Back in 2003 it cost me $1454.55.

These variable vane turbos are the standard turbo fitted to the 4.0 litre Nissan Patrol diesel engine in Australia, and that particular engine produces 150Kw, so they are a rather small turbo. Two of these would be required on a larger engine.

Porsche seem to have made it work, where nobody else has. No doubt it took a lot of fairly sophisticated engine management and a lot of development. Don't think you can just bolt one on to your Skyline and get the same sort of results without the control system to make it work properly. There is far more to it han just hooking up a standard wastegate actuator to the vane control arm.

[kjb_r33]

I beleive VW have been using variable vane turbos for years