VNT Vane control!!!!

[the4ork]

now first let me start by sharing my background...

for the past 3.5 years i've been an active duty air national guardsman (airforce guard) as an F-16 hydraulic / pneumatic mechanic, with this knowledge, and my sudden interest in VNT turbo's i promptly came up with this idea!

[rallydiesel]

That is a beautiful drawing. Now make a working model.

 :wink:

[jackbombay]

How does the go pedal tie into it like "named tintin's" and libbypapa's?

[the4ork]

no go pedal...

when not boosting or in vacuum the vanes make the smallest a/r... when the turbo starts building boost, (as your engine revs up) the boost signal starts builds and eventually overcomes the spring, at the same time, attatched to the piston the linkage is starting to pull the vanes to a larger a/r... at this point, in the picture i have a 25lb spring, so once you get about 25psi, it should be pushing 25lbs at the spring, opening the vanes and theoretically holding 25psi...

this should work at part throttle also, since you will be seeing about 0 on the boost gauge, when you mash the gas you will start building boost, again the vanes will be at the small a/r until boost pressure overcomes the spring.

so to control boost either change the spring, or incorporate an adj. spring tensioner in the piston housing.

next is for me to find a piston housing like this that i can modify, or find someone who's hott ***t on a lathe to fabricate one

[Tintin]

Your idea is the same as simply put a wastegate pressure actuator coming from another turbo, like the garrett T-2 actuator.

That takes a linkage attached to the accelerator or pump lever accelerator to make move the vanes in proportion to the load, it is not obliged, but that controls the boost much more better than without linkage.

[the4ork]

if you have it hooked up to the pump, or the gas pedal whenever your at wot say on the highway at full boost, there is no way to back the boost off without letting off the throttle, plus you want to be able to hold full boost with the vanes more open for better exhaust flow while maintaining boost, which an actuator can do

[Tintin]

I think that you did not completely understand how my system work.

I will repeat it again, but I have it already write several times in detail here, in some post.

When I push the accélérator pedal, the vanes are closed in proportion of the travel of the accelerator, and the actuator push in the other direction to open the vanes to adjust the boost, my system work identically like a wastegated turbo, if you sitted in my car, by looking at my boost gage and the feeling of the car,  you would be unable to say to me if it is a VNT with linkage or a quickly wastegated  turbo.

There is no way to opening more the vannes by maintaining the same amount of boost, at once that you opens the vannes just a little, the boost goes down, with the vannes completely open, the turbo spool around 13-14 psi at full throttle at 4000RPM,  at 3000RPM, it's around 7-10 psi, the turbine wheel and turbine housing is not designed to work without the vannes system.

With a GT20 wastegated turbo, it's easy to make 25psi of boost, but, with GT20 VNT turbo without vannes, impossible.

[the4ork]

ok i see what your saying now....

yeah thats cool, do you have any detailed pictures or drawings i can take a look at? i'd like to see how easy/hard it would be to rig it up, i saw a random VNt linkage video on youtube or something a few days ago in a red car, maybe thats you?

i like the idea of what i designed above for the fact that i could be built and sold as a kit, if someone wanted to take it that far, its not THAT complex, just requires a cylinder, piston, an o-ring, and a sealed endcap... any decent machine shop should be able to fabricate one

[the4ork]

also i'd like more info on your VNT20 setup, i've asked around on the forum a few times about turbo upgrades and everyone says k24 or stock t3... which im getting tired of...

up until i really understood the potential of the VNT turbo's i had my heart set on getting a GT 2052 /w the smaller compressor trim to run about 25psi

[rallydiesel]

I don't get it. Isn't your (the4ork)  set-up the same thing as putting a waste-gate actuator on a VNT?

[the4ork]

same but uses a spring....

[the4ork]

Hey.. tintin, for your VNT20, that has to use a t25 turbo manifold right? or is it a straight t3 manifold? are you using the kermatdi setup?

[Tintin]

Your compressor map not work with my VNT 2052,  mine are 45 A/R.

I use the  stock T-2, T3, K14, or K24 exhaust manifold and make an adapter-spacer betwen the turbo and manifold.

On the middle of these page: http://vwdiesel.net/phpBB/viewtopic.php?t=2848&postdays=0&postorder=asc&start=30

[OM617]

same but uses a spring....

Wastegates have a spring inside.

Your system is identical to mine. Problem is, the vanes will always be closed except for at maximum boost. This will hurt your economy by restricting the exhaust ans has no fail-safe mode.

[shadowmaker]

I have an electronic device to adjust my vnt. It's made and setup by my programmer. He can adjust vanes at any rpm and throttle position. It's located inside my non-vnt ECU. It's working quite nicely.