Garrett VNT 20 ????
 

'm new to this forum (i'm from belgium Embarassed ) and i want to put a turbo in my civic coupe it's a D16Y8 , i have a turbocharger (garrett) he comes of an audi v6 2.5 butt i dont know anything about this turbocharger i only know this (comes of the tag)


A/R .45
3-503.03-1
VNT 20 059145701C GS4
454135-2 s/n cb102894

I don't find any spec's of this on the site of garrett can someone help me ,is it possible to put this in my car does anyone have experience with this kind of turbo VNT 20 (variable nozzle turbo )

Re: Garrett VNT 20 ????
 

post pics! always wanted to see what a VNT looks like

Re: Garrett VNT 20 ????
 

hallo,ook van belgie?? geef uw msn is via pm dan kunne we wa zevere over turbo's ;D

Re: Garrett VNT 20 ????
 

Here are some pics of VNT
http://img147.imageshack.us/img147/4...rrett078zp.jpg

http://img147.imageshack.us/img147/7...rrett080xc.jpg

http://img147.imageshack.us/img147/5...rrett149pr.gif

http://img100.imageshack.us/img100/7...rrett020kr.jpg

Re: Garrett VNT 20 ????
 

What the heck? That's all I can say. I don't even get that. Redirects air?


JP

Re: Garrett VNT 20 ????
 

no, i believe it more or less changes the A/R of the turbine side, so you have fast spool up and then it'll get larger to accomodate more flow (i think) i just never knew how the internals worked. Pretty cool.

Re: Garrett VNT 20 ????
 

W0rd. Yes, that is cool.


JP

Re: Garrett VNT 20 ????
 

Cool pictures.That explains a few things.There are alot of those VNT turbos kicking around from factory cars and Im surprised I have not seen more of them being used.The idea is good.

Re: Garrett VNT 20 ????
 

HOLY ---- !!!!! That is the first time I have ever seen anything like that. So is there some sort of servo controller to adjust the flaps based on vehicle rpm/speed?? Sounds like a great idea - would love to see something like that on one of our cars and fully functional.

Re: Garrett VNT 20 ????
 

I don't see any sort electronics on it. I think that it is based purely on the force placed on it by rotating inertia (wrather that is the proper term or not I am unsure). Anyways, it's kind of like a merry-go-round. When it is going slow, you can stand up, but as it goes faster, you start to be pulled out. Purely mechanical I do believe.

Re: Garrett VNT 20 ????
 

Maybe a Centrifigual Clutch.


JP

Re: Garrett VNT 20 ????
 

I saw an exploded vnt at an international truck plant and it was pretty cool. It was from a power stroke.

Re: Garrett VNT 20 ????
 

probably boost dependant i guess. Maybe uses a diagphram and a rod like a wastegate ?

Re: Garrett VNT 20 ????
 

Here is a link http://www.technologie-entwicklung.d...t15-turbo.html

so nobody has some expierence with this ??? should i risk it to put this in my car (D16y8) :S

you see also that there is no wastegate ??? what about that ???

Re: Garrett VNT 20 ????
 

damn.. never seen anything like that before. very interesting

Re: Garrett VNT 20 ????
 

i knew i herd about this before. i originally saw it on "trucks"
http://www.bankspower.com/sidewinder-turbochargers.cfm
http://www.bankspower.com/Sidewinder...ochargers1.jpg

Re: Garrett VNT 20 ????
 

i had one of these, these come stock on dogde shelby csx's , the fins redirect air to the turbine wheel inner or outer (minor/major) to change the spool characteristics, 0 lag, similar to the purpose of the evo's twin scroll turbine housing. thats a very good tubo for a roadrace car, street car.

Re: Garrett VNT 20 ????
 

you cant use a diesel vnt turbo on a petrol engine it wont last very long (thats why you dont see them fitted to petrol cars )
its has been done but the geometry tends to fail
peugeot on the t16 engine had a similar turbo

Re: Garrett VNT 20 ????
 

because of EGT's or RPM's?

Re: Garrett VNT 20 ????
 

wow thats cool

Re: Garrett VNT 20 ????
 

egt's
i have seen people using vnt turbos but with low boost 8 psi max

Re: Garrett VNT 20 ????
 

due to the egt's that gas cars put out, VNT's are not used much. Porsche is comming out with its first variable vane turbo in the new 911's. the way it works, it varies the exhaust turbine's speed for the best power at different rpm's.

trucks have been using them on the disel engines for quite sometime. wish we could use them on gas cars, it would give us a flat torque curve all the way to red line from like 1500 rpm's. :S

Re: Garrett VNT 20 ????
 

yea no lag at all, my friends shadow csx has full spool at like 2k all the way to redline, i think we'll be seeing more of them

Re: Garrett VNT 20 ????
 

Funny reading this question, I was about to ask a similar one.

A VNT20 is a pretty large turbo though, capable of quite a bit of flow. I do believe the 2.5 Audi diesels came with a GT2052V which is a VNT17, not a VNT20. Bit confusing nomenclature, that. Similarly, the GT1749V I'm looking at is a VNT15, off a 110HP VW TDI 4cyl.

I agree it's rare on petrol engines, but the Shelby CSX used it... are these troublesome?

Geometry failure is also seen a lot on diesels with these turbos, but that's mostly due to carbon buildup.
So that extra 100c EGT really does 'em in then eh? There's really not THAT much of a difference between diesel and petrol EGT's...

BTW the Peugeot 405 T16 used a VAT25. A VAT25 has a much simpler single vane mechanism AND an internal wastegate. VNT's do away with the wastegate completely although it is said some large applications use an external wastegate. Never seen one though.

Marcel

Re: Garrett VNT 20 ????
 

yoco:

here is my audi 2.5 v6 tdi 150hp turbo (the 180hp versions don't have the exact same turbos)..

Attachment 36101
Attachment 36102
Attachment 36103

Re: Garrett VNT 20 ????
 

Just found out many modern diesel VNT's are vacuum controlled through ECU modulation. rather than boost controlled like the old VNT25's were. Looks like that Audi turbo is one of the vacuum controlled ones. Probably difficult to control when slapped on a car without such controls.

Re: Garrett VNT 20 ????
 

you can modify the turbo to be controlled by pressure many people use them on diesel engines without electronic control

and regarding t16 i know that its not a vnt turbo ;)
what was the turbo used on the shellby , possibly custom made to that model

Re: Garrett VNT 20 ????
 

i don't remember the exact model on the shelby csx, but you can look it up if you want. all i can tell you is its a garrett vnt and its about the size of a td04-tdo5 and uses vacuum controlled vnt. my friend hasn't had a problem with his turbo to date but i don't see what egt's have to do with use on petrol engines its irrelevant i think that its the production cost maybe, because these are bit more detailed than a normal turbocharger and they consist of alot more parts. just my .01 cents though

Re: Garrett VNT 20 ????
 

it explains it all in the maximum boost book. there alot more expensive