Vnt install

[rodpaslow]

I need to get pictures from the bottom to see the actual connection to the turbo.  I'll post that soon.

My oil out of the dipstick shouldn't have been an issue as I have the pcv can on the valve cover running back to the intake side of the turbo which is low pressure.  I need to investigate some more on this...

[R.O.R-2.0]

ROR - what do get for boost running at 3000 or so revs and putting the go pedal to the floor?  Now I'm a bit worried I will have too much - 40 psi is waaaay too much.

if im running 3k revs, and i floor it, i get full boost.. fairly instantly.

[carrizog60]

since you have the setup iniatially not working well may i ask some questions?

i have a 1.9d with a gt2052,using only a T2 wastegate that limits the boost to around 1/1.1bar
when driving at partial throtle and keeping the go pedal on the same position i noticed that the car will go faster after WG opens(with the correspondent exhaust note ).
do you have the same problem?

my car is very quiet at idle and up before WG opens,is yours the same?
or is WG open at idle(no accelerator to pull the vanes close) and the car loud?

if you could describe your driving experience i will be apreciatted,really need to sort my vnt control and with vacacions that would be a good time to do it.


i have a passat 35i,and the WG can almost touches firewall so is hard for me to do a full makeover to what is already done(not by me)

[rodpaslow]

Initially with the VNT, I had the vane control (it's not a wastegate on the VNT) opposite to what it was supposed to be.  When accelerating instead of closing the vanes I was opening them as I stepped on the go pedal further.  What you described is what was happening.  It seemed like at a certain point the boost can would close the vanes slightly and I would get better acceleration.  I just had to add a pivot point to reverse the action of the lever.  With your limited space I don't know how you can do that.

I would first try and disconnect the wastegate (air line to the wastegate) and see what it does.  If it's better there may be some problem with the wastegate.  I don't have much experience with wastegates - others may be able to help more...

[carrizog60]

for what i understand(were set by the mechanc that installed the turbo) the vanes are set to boost at idle because the car is very silent.
when boost hits 1 bar the can pushes down the vanes lever.loud exhaust(63mm stainless)and boost stops climbing.
and only at that time i feel the power,is like almost the kick that the k24 used to give me when it spooled and hit high boost)

what i would want was a silent car at idle and around town but when cruising i didnt have to floor it to feel the power(and noise lol)

i am in part happy because the car is silent and in race mode is quick,but there is no middle term...

[rabbitman]

ROR yours must be stuck mid way or something.  I've got a relatively new motor, less than 15k miles and with the VNT engine revs at 3000 lever set for low boost, I don't get much of anything showing till 3400 revs and over.  I wanted a VNT for boost below 3000 revs and just a test it starts at about 1500 an builds from there is the lever is set for high boost / all way down.

rodpaslow that sounds just like what my VNT was doing, very little boost unless I set the vanes about halfway then I could do about 13psi while blowing large black clouds out the tailpipe and 1300+ egt. I never got it figured out .

[rodpaslow]

Yes that's about how my vnt reacts too if the vanes are about 1/2 way to all way open.  My control uses a spring and weight of the can and assembly to use the control to open the vanes all the way at idle.(spring pulls the vnt link to open - towards the hood of the car)  Off idle my cable control closes the vanes to full closed by full throttle.  If the vanes are half open to open it pukes black smoke like you wouldn't beleive if I disconnect the cable control.  As soon as you step on it with the control connected it clears up any smoke and I've turned fuelling up about 1/2 turn and still no black smoke.  I could go more but it pulls hard now right up to about 22 psi.  And it reacts very quickly.  By 1500 rpm it's a 16 psi if I'm at full throttle.

My vnt is very noticeable at idle.  It has a significantly louder wine than the t3 had.   The t3 you couldn't hear till about 2500 rpm when it started spooling.  The vanes are open at idle on my car so I would think they are closed on your if its quiet.

To test it, I would disconnect the boost can that I can see in the picture.  just hold it one way with a spring or something like that and take it for a test drive.  It's fairly easy to control boost by your go pedal.  I live where there's no hills or mountains and I can drive it without boost if I like.  Just be carefull because if the vanes are closed it will jump up quite quick.

One way or the other (move the spring to hold it in one direction then the other) should produce boost.  I'd suggest having a boost gauge to make sure of this.  Hope this helps...

[carrizog60]

i know mines are on boost position on idle because the car is very silent.
on your setup wouldnt you have the same problem at transition between max pressure and not?
when cruising at higher speeds,if you dont hit max boost but still need half throtle to mantain speed,wont the vanes be closed trying to build boost?
that in higher speeds is bad right?
saying that because my passat heats more cruising at 120km/h(vnt silent and trying to build boost) than on faster travel speeds(driving at 180km/h its more stable,has more power,but is louder-vanes not restricting flow)


what i would want is that power but without the noise in smaller speeds around town,dont want to catch cops attention...

so how you have your vanes setup open?by adjusting the vanes lever in relation to boost can?

[rodpaslow]

the current way I have mine set is at 75 mph (120 kph) I have about 5 lbs of boost.   If i want to accelerate and get more boost all I need to do is step on it.  Boost can only cuts in when it hits about 20 psi and then extends the cable (essentially) and opens the vanes more.

If I hold it to full throttle turbo will build max boost to about 20 psi and vanes will be open due to boost can being on full, restricting boost.
If crusing, at speed and it's not at max boost, but still need half throttle, vanes are approximately half open still providing some boost, something like 5 lbs or so.  Until I move pedal further to full throttle.  as I move it further I get more boost.  AT 180 kph I'd bet I'd be at max boost 20 psi at all times.  If I drove at that speed I would need to adjust the cable & boost can so I got less boost (open vanes more); and so vanes would open later.  Thats the nice thing about having adjustable - the boost can itself has alot of threads and the cable has a bit of ajustability at the pump connection (adjusts cable length).

Vanes open at idle, closed by cable movement made by throttle until floored.  As soon as roughly 20 psi is hit, boost can opens them (the vanes) to maintain a steady 20 psi or until I back off the throttle.  I can also control boost by throttle position; by doing so I'm also controlling vane position.  My boost can only controls max boost and only vane position at max boost.  The cable connected to the throttle does the rest.

[R.O.R-2.0]

i know mines are on boost position on idle because the car is very silent.
on your setup wouldnt you have the same problem at transition between max pressure and not?
when cruising at higher speeds,if you dont hit max boost but still need half throtle to mantain speed,wont the vanes be closed trying to build boost?
that in higher speeds is bad right?
saying that because my passat heats more cruising at 120km/h(vnt silent and trying to build boost) than on faster travel speeds(driving at 180km/h its more stable,has more power,but is louder-vanes not restricting flow)


what i would want is that power but without the noise in smaller speeds around town,dont want to catch cops attention...

so how you have your vanes setup open?by adjusting the vanes lever in relation to boost can?

a VNT does not have a wastegate. they dont sound any different when the vanes open. they do SCREAM compared to a conventional turbo tho..

you dont have a VNT if you have a wastegate..

idk why all you guys have such problems with your turbos, mines got the vanes all the way open, and it spools great, and makes my car a rocket.

[rabbitman]

Mine was quiet with the vanes shut at idle, barely any exhaust noise. With the vanes full open at idle it was only a little louder and sounded really nice driving, it wasn't nearly too loud to drive. Any position gave a real nice whistle at idle.

I pulled the turbo off last summer and was planning to get it rebuilt and reinstall it but now I'm thinkin' it was something else making it not act like libbybapa's and ROR's and a lot of other peoples.

Has your fuel economy changed since the install?

[carrizog60]

i know mines are on boost position on idle because the car is very silent.
on your setup wouldnt you have the same problem at transition between max pressure and not?
when cruising at higher speeds,if you dont hit max boost but still need half throtle to mantain speed,wont the vanes be closed trying to build boost?
that in higher speeds is bad right?
saying that because my passat heats more cruising at 120km/h(vnt silent and trying to build boost) than on faster travel speeds(driving at 180km/h its more stable,has more power,but is louder-vanes not restricting flow)


what i would want is that power but without the noise in smaller speeds around town,dont want to catch cops attention...

so how you have your vanes setup open?by adjusting the vanes lever in relation to boost can?

a VNT does not have a wastegate. they dont sound any different when the vanes open. they do SCREAM compared to a conventional turbo tho..

you dont have a VNT if you have a wastegate..

idk why all you guys have such problems with your turbos, mines got the vanes all the way open, and it spools great, and makes my car a rocket.

sorry,i said wastegate because the can that control the vnt was a wastegate from a T2.
and sorry but it sounds diferent,veryyy diferent.
alot louder.
i have full 63mm stainless steel exhaust from turbo and at idle with vanes closed the car is quieter that a stock one.as soon as max boost is achieved it sounds way louder,like a K24 sounds.
http://www.youtube.com/user/carrizog60#p/u/1/FiQvU6AQRXE

i dont have a lightweight car,is a passat wagon,with widened steelies,tdi longer gearbox ratios and that hurts performance.
also a vnt15 spools alot quiker than a gt2052v,with the vanes fully open will be almost a wastegated turbo loke k24...

rodpaslow,how much travel is needed to operate the vanes from stop to stop?wont the spring in the accelerator extend when working or is the vanes easy and light to move?

[R.O.R-2.0]

Mine was quiet with the vanes shut at idle, barely any exhaust noise. With the vanes full open at idle it was only a little louder and sounded really nice driving, it wasn't nearly too loud to drive. Any position gave a real nice whistle at idle.

I pulled the turbo off last summer and was planning to get it rebuilt and reinstall it but now I'm thinkin' it was something else making it not act like libbybapa's and ROR's and a lot of other peoples.

Has your fuel economy changed since the install?

yea, my economy went down, from using the boost soo much 

that aside tho, im sure i could easily get 500 miles a tank if i stayed out of the boost.. my car does really good on fuel actually. it gets almost 2x the mileage of my gasser.

[8v-of-fury]

yea, my economy went down, from using the boost soo much  

Your economy went down from pushing the pedal more than needed, boost helps efficiency.

that aside tho, im sure i could easily get 500 miles a tank if i stayed out of the boost.. my car does really good on fuel actually. it gets almost 2x the mileage of my gasser.

500mi on 40L should be easily doable even cruising at 12-13psi.. As I achieved the same mileage on a tdi with the tiny k03 running at max boost pressure for the entire trip. Are you telling me you got only 20ish mpg out of your gasser? I've seen 28-29mpg from a 3spd auto at 4000+ rpms.

[R.O.R-2.0]

yea, my economy went down, from using the boost soo much  

Your economy went down from pushing the pedal more than needed, boost helps efficiency.

that aside tho, im sure i could easily get 500 miles a tank if i stayed out of the boost.. my car does really good on fuel actually. it gets almost 2x the mileage of my gasser.

500mi on 40L should be easily doable even cruising at 12-13psi.. As I achieved the same mileage on a tdi with the tiny k03 running at max boost pressure for the entire trip. Are you telling me you got only 20ish mpg out of your gasser? I've seen 28-29mpg from a 3spd auto at 4000+ rpms.

ok, well my economy went down from over-use of boost, if you want to get super technical. stock diesels are weak. there is no reason to drive them agressively. my TD is not weak, and i love to hear the turbo, chirp the tires, and feel the acceleration..

THAT is why it only gets about 40 mpg.

and yea dude.. i only get 27 mpg in my gasser around here (stock 1.8, ACN trans w/ REALLY long gears. again, i drive with my foot closer to the floor than most. and there is not one straight piece of road around where i live. it is impossible to get optimal mileage in any vehicle around here.. environment plays a big role.. on the freeway, my gasser gets almost 35 mpg.

and i said it ALMOST gets 2x the mileage of the gasser.. i bet my diesel would get 50+ mpg if i could actually check mileage for a tank.. ive never even been able to accurately check the economy, the odometer is F'd