Variable Gemoetry Turbo (VGT)

[Ironsquid]

Originally Posted by cdrazic93

Well damn. I figured expensive complicated turbo - you need an expensive complicated ECU to control the beast.

Hey EcuTEK is expensive

[King Tut]

Originally Posted by jamesm

it it runs on duty cycle ecutek can

IN for screencast of adding VGT maps to EcuTek.

[cdrazic93]

Originally Posted by Ironsquid

Hey EcuTEK is expensive

Not compaired to motec.

Edit: sorry, when scrolling if you see a ton of cows lol

[Lee@JDLAutoDesign]

We did a one-off compound turbo setup for a friend's TDI a few years back with a VNT high pressure turbine. There are definitely tangible gains to be had using this technology, especially in a single turbo setup, but it's obviously a trade off with complexity and cost. (Sorry for the blurry pic)



In this case the VNT turbine with the external high pressure bypass gate and the internal low pressure wastegate made controlling the total boost very difficult. In the end I had to build a spreadsheet model of turbine system so we could determine the optimal VNT schedule and communicate that to the tuner, who was controlling the vanes through the factory VW ecu. In a single turbo configuration I think the control/optimization issue becomes much, much simpler.

If you pursue this and need some suggestions/guidance, I'd be happy to help. My first suggestion is to see what information you can find out about the turbine maps for the turbo you intend on using.

[cmcauley]

If I remember correctly, one of the major issues Porsche had with applying this tech to gas engines was the amount of heat created. From one owner I talked to with a 911 turbo early on, he had to get his turbos replaced under warranty because of failure from excessive heat.

[Hanni_0176]

Originally Posted by Lee@JDLAutoDesign

We did a one-off compound turbo setup for a friend's TDI a few years back with a VNT high pressure turbine. There are definitely tangible gains to be had using this technology, especially in a single turbo setup, but it's obviously a trade off with complexity and cost. (Sorry for the blurry pic)

In this case the VNT turbine with the external high pressure bypass gate and the internal low pressure wastegate made controlling the total boost very difficult. In the end I had to build a spreadsheet model of turbine system so we could determine the optimal VNT schedule and communicate that to the tuner, who was controlling the vanes through the factory VW ecu. In a single turbo configuration I think the control/optimization issue becomes much, much simpler.

If you pursue this and need some suggestions/guidance, I'd be happy to help. My first suggestion is to see what information you can find out about the turbine maps for the turbo you intend on using.

Twin Scroll VGT turbo kits? That just made my day right there, even if it never comes to pass. Maybe once I'm ready to go turbo, this will be a possibility? I'll keep my fingers crossed.

[Ironsquid]

I just realized how badly geometry was spelled in the title lol

[scraejtp]

Originally Posted by mid_life_crisis

Direct injection was in diesels for decades and now it's everywhere.
Give it time.

It isn't that VGT is that new. The EGT of a gasoline engine is much higher than diesel. The current materials used really can't last in a gasoline application.

[cdrazic93]

Originally Posted by Ironsquid

I just realized how badly geometry was spelled in the title lol

I noticed it 2 seconds after I posted it...

Didn't you know? Gemoetry is the cool way of spelling it now
Ya I got nothin...wait wait, it's hard to type on an iPod screen with my fat fingers? Yeah that covers it lol

[EZWood]

Originally Posted by Lee@JDLAutoDesign

We did a one-off compound turbo setup for a friend's TDI a few years back with a VNT high pressure turbine. There are definitely tangible gains to be had using this technology, especially in a single turbo setup, but it's obviously a trade off with complexity and cost. (Sorry for the blurry pic)



In this case the VNT turbine with the external high pressure bypass gate and the internal low pressure wastegate made controlling the total boost very difficult. In the end I had to build a spreadsheet model of turbine system so we could determine the optimal VNT schedule and communicate that to the tuner, who was controlling the vanes through the factory VW ecu. In a single turbo configuration I think the control/optimization issue becomes much, much simpler.

If you pursue this and need some suggestions/guidance, I'd be happy to help. My first suggestion is to see what information you can find out about the turbine maps for the turbo you intend on using.

I have a turbo from a 6.0 powerstroke sitting in my room that I would be willing to "donate" for research in exchange for either a discount in the future, or maybe even an awesome discount on a uel header that would be compatible with a turbo kit in the future. I was thinking with the size heat and emp would be greatly reduced and I heard of a ford tech putting one of these on a 1.8 Mazda motor making 15 psi @ 3500 rpm. Imagine the possibilities.

[cdrazic93]

Originally Posted by EZWood

I have a turbo from a 6.0 powerstroke sitting in my room that I would be willing to "donate" for research in exchange for either a discount in the future, or maybe even an awesome discount on a uel header that would be compatible with a turbo kit in the future. I was thinking with the size heat and emp would be greatly reduced and I heard of a ford tech putting one of these on a 1.8 Mazda motor making 15 psi @ 3500 rpm. Imagine the possibilities.

Another idea would be for someone get a hold of the new boxer diesel in Europe, drop it into the 86, convert it into biodiesel, then place a VGT turbo on it. Gobs n gobs of torque way down low. And a meaty powerband.

[Shiv@Openflash]

My 997tt has stock VGT turbos and they are ridiculous compared to traditional fixed vain turbos. Full boost comes on like a light switch. Almost too abruptly. There is still lag (delay between throttle application and boost onset). But the rate of boost rise once boost is achieved is nearly vertical. Yikes!

[EZWood]

Originally Posted by cdrazic93

Another idea would be for someone get a hold of the new boxer diesel in Europe, drop it into the 86, convert it into biodiesel, then place a VGT turbo on it. Gobs n gobs of torque way down low. And a meaty powerband.

I havent heard one good thing about the diesel boxer.

[cdrazic93]

Originally Posted by EZWood

I havent heard one good thing about the diesel boxer.

Well shit. I figured subaru would be good enough to build a decent diesel. Apparently their experience lends themselves to only gas engines...

What kind of problems does it have? Or a better question, what kind of problems doesn't it have?