Author Topic: which vnt? (Read 2393 times)

carrizog60 · « **on:** September 16, 2008, 07:09:03 pm »

hello

i have been searching for a rebuid kit for my k24 and since its dificult to source one i thought that now could be the time to move forward and to the vnt turbos.
so before any buying frenzy lets make it clear:

-do i need a turbo without manifold (like the k24 so it needs to be a square tipe exhaust right?) or is it fine to buy a turbo with integrated manifold?
will all fit on vw 1.6 ports and bolts?

-are they just oil cooled or do i need to get some water pipes for it?

-what are the other parts that i need beside turbo and custom exhaust?where to search for them?

-is there a way to control the vanes without making it boost like crazy when cruising at part throtle and still be able to have some sort of scheme to clean the vanes and avoid sticking issues?

now for the turbo itself...

-it needs to be good for 1.5 or more(small blasts) bar and still reliable/eficient.(+2.4bar on k24 sometimes lol ...)

-dont make crazy boost at low rpm because i want to keep my stock and almost new oem clutch but still be better than the laggy k24.(2000rpm pickup versus 3000rpm k24 does will be great)

-fit without any cutting or welding(strickt laws...)

i was thinking a vnt2052v because the vnt17 would be too hard on low rpm and ruin the trans and clutch :idea:

the engine will have stainless 2.5"custom exhaust(to fit new turbo) and i could do governor mod and install a 10mm head i have laying around.

already has a "almost cut to death" boost pin,big intercooler,timing to 1.05mm and almost maxxed out fuel screw.

thanks

MJF · « **Reply #1 on:** September 16, 2008, 07:25:41 pm »

I liked 2052 from Audi 2,5 V6 tdi. It´s good to around 170hp. It´s big enough, but spools faster than K24.

carrizog60 · « **Reply #2 on:** September 17, 2008, 02:50:40 am »

what about the questions?

thanks

carrizog60 · « **Reply #3 on:** September 17, 2008, 04:59:42 pm »

no help from the vnt owners?

zukgod1 · « **Reply #4 on:** September 17, 2008, 05:49:46 pm »

We be slow. It may take a couple days for the responses to roll in.

carrizog60 · « **Reply #5 on:** September 20, 2008, 01:14:11 pm »

no one?
a friend said that for the controler it will just need a pressure bost can atached to the vnt actuator...
as soon as boost rises it will open the vanes :idea:

jtanguay · « **Reply #6 on:** September 20, 2008, 01:56:27 pm »

the problem with that setup is that you can get boost spikes, and the driveability down low isn't the greatest. VNT's spool up very quickly, so even light acceleration will give you 10 psi. once the enrichment kicks in you'll feel it want to pull. sometimes you don't need that.

another problem is that the vanes will probably get stuck if you don't max out boost all the time. normal TDI's with VNT's actuate the vanes fully at startup (and maybe shut down) just to make sure they don't stick. i'd imagine giving your car a good run on the highway every once in a while should keep that from happening.

carrizog60 · « **Reply #7 on:** September 20, 2008, 02:17:13 pm »

ys, been reading now and going to tel that to my friend.
what about all the other questions?
can someone help?

jtanguay · « **Reply #8 on:** September 20, 2008, 03:01:47 pm »

http://www.youtube.com/watch?v=Frs6aQGOrlo&NR=1

that is the kind of setup you want, and a VNT-17 or even 20 should be able to give you 20 psi or so.

carrizog60 · « **Reply #9 on:** September 22, 2008, 02:54:47 am »

ok,lets search for vnt20 then.
what about the other questions?

MJF · « **Reply #10 on:** September 22, 2008, 04:14:21 am »

Just oil, no water cooling. You can use stock 1,6 exhaust manifold with small adapter plate. Also oil lines must be modified. I cut the original steel line and used a short hydraulic hose with banjo fitting to connect turbo. On return side, I used 19mm od steel tube and 19mm ID rubber hose.

I used just boost can to control vanes. I had to keep vanes so much open that boost didn't go too high at cruising.