Anybody see the segment on Trucks on spike tv sunday? Banks had a turbo for diesels that could countrol the flow on the hotside electronically with accuators. Basically it let a huge turbo like a t51kai spool like small turbo and then as rpm's increased it opened for full exhaust flow and made the big numbers. Think it'll catch on and someone make a system for our cars? Be awsome to run around with a huge turbo and almost no lag.

 

If you have a look at a book called "maximum boost" by Corky Bell, there's a section in there about them or something similar. They're called variable vane turbos or something, whereby the turbine wheel can be continuously changed from wide open (little boost but high exhaust velocity ) to closed (thereby forcing maximum exhaust into your turbo) and anywhere in between.... no need for a waste gate, so nothing is wasted technically...... they are reported to spool up in about 1/4 the time of a standard turbo of similar size, and also will help considerably with exhaust gas velocity in the higher RPM range.

I think a company called aerodyne do them or something

cheers
Evil G

 

yeah that sounds like what I saw. This one was made by garrett though for gail banks. so if garrett is making them then maybe there's a shot they'll wind up in some of our cars. I'd get one.

 

i was SOOOOO going to post this but couldn't get an internet connection. Wondered if there was something for the 7 we could fab up or buy somewhere. I thought it was an awesome idea

 

i've been trying to post since monday but kept getting some upstream server proxy error bullshit

 

the old Shelby CSX uses this kind of turbo and doesnt have a blow off valve.

 

Isn't this just a Chrysler VNT turbo?

 

They have been slow to catch on but are beginnning to gain widepread use. Ford and Chevy both use them on their diesel trucks. Mercedes is going to use a pair of them on their next diesel engine as well. I think it's only a matter of time before we see more cars equipped with them and the aftermarket following with over the counter pieces.

 

Expensive..lol I've been aware of this technology for like..2 years..this and the two turbos that run in series and compress the air twice..It seems wierd I'll try to dig up the article I read..

 

I said before Ford uses a VNT on the 2005 diesel truck, computor controlled, all of the best ideas on piston engins come from Diesels, and Rotarys dont GO with out boost, which is a take off of a Diesel turbo! RON

 

Problem is... the reason you see all the VGTs on diesels is that they tend to have lower EGTs. Garrett doesn't rate the VGTs for much more than 1500 degrees, IIRC.

 

There a very large thread on supra forums about this. There is also a thread here bout them. Id give you the link, however my laptop died.. so no link fo u

 

My '05 Golf has a VNT. The spool is shocking at about 1/4 of a second. These don't use wastegates, but in a typical gasolene application they will still use a BOV. Coupled with the exhaust power of a typical rotary these could lead to very impressive driveability.
Grant

 

VATN's Aerochargers are Variable Vane

 

So for someone like myself who doesn't know all the in-depth inner workings of a turbo, can you modify a turbo to work in this way, or does the turbo have to be built like this from the get-go? I'd love to see HKS, Greddy etc coming out w/ turbos like this. But to my understanding, this would really only be helpful in spooling quite a large turbo, right? A medium sized ball bearing turbo would spool fast enough as it is, right?

 

Unfortunately, these diesel turbos are not suitable for petrol engines. The VNT mechanism can't withstand petrol engines EGT.

 

Does anyone have any pictures of these turbos....pics that show the variable part

 

Hey, a turbo diesel FD would be awesome...to hell w/ emissions, and you'd prob get what...20 miles to the gallon?

 

if you can get your rx7 upto atleast a 16:1 static compression, go nuts, if not..

 

Heres the link for the thread on supraforums, join to view

http://supraforums.com/forum/showthr...highlight=VATN


And heres a pic of the hotside

 

Aerochargers have VNT, all ball bearing, self contained oil system, and can be mounted in any position. called them about 2 months ago ! no longer being manufactured, because of lack of enterest. I have one which I took apart to see how it was made very unique !RON

 

variable area turbine nozzle systems have been around for at least a decade but are only now getting more mention and popularity.

Series turbocharging has been around for decades and has been used primarily for diesel tractor pull engines where boost pressures near 200 psi are used. Sometimes even 3 or more are used in series to achieve the pressures they want.

 

i like the 20 mpg idea

 

Are you sure about this? Where do you get this information? I have found nothing about VNT turbos used on an VW products, let alone the 2005 Golf... I didn't even think the 2.0T engine was out in the Golfs yet. A search of VW's site found no info about VNT's either, and this seems like a tech worth making a stink over.

As for the technology of Variable Turbo, my undergrad schoo, UCSD, used a Variable turbo on 600 cc Yamaha sport bike engine for a SAE competition. It worked ok, but not great, had trouble getting the boost pressures they were looking for.

Collin Webster
89 TII

 

BlueTII has been working on a system for these for a while.