No boost, runs fine N/A, Turbo seems ok

[Kain66]

Alright, so I had to take the engine apart and put it back together now. The engine is still stock(1995 Eclipse GSX) and runs really smooth (pulling about 20-25 in hg on my boost gauge), but when I accelerate the vacuum drops 10 in. and holds steady. So now I'm trying to get the turbo to work and I'm coming up empty.

I checked the turbo, no play on the shaft, spins freely by hand and w/engine on. All vacuum lines seem to be on right, and I'm doing a intake leak test later today. I think I've tried everything from what I could look up on the site, the only thing I'm not sure about is the WGA. Its open of course, but the actuator seems to be working. So I thought that the WGA was vacuum operated, but it was when I applied air to it that it moved. So if thats the case, my vacuum diagrams show that the turbo feeds pressure out to the WGA which is controlled by the solenoid that dumps the pressure into the intake. Is this correct? or did I really mess up with that.

In any case, I don't get any vacuum or pressure out the bottom vacuum nipple in the turbo. The car started nicely after the assembly, nothing wierd or any strange sounds out of the turbo so I don't think anything damaged the turbo recently.

So there, I'm stuck. Please help, I'm going crazy over this crap. Thanks Guys

 

[WarSaw]

You will not build boost with the actuator open. Inside the wastegate there is a spring that holds the arm in. As you build boost, the pressure in the vacuum line will overcome the wastegate spring, letting it open and bypass the exhaust gases preventing further boost from building.

Now, you said your wastegate is open all the time? If so, thats the problem your having.

 

[chris9149]

Its open of course, but the actuator seems to be working. So I thought that the WGA was vacuum operated, but it was when I applied air to it that it moved. So if thats the case, my vacuum diagrams show that the turbo feeds pressure out to the WGA which is controlled by the solenoid that dumps the pressure into the intake. Is this correct? or did I really mess up with that.

Sounds to me like you are talking about your BOV (blow off valve) vacuum line having the "T" fitting and going back to the WGA. That is set up fine if that is how it is. The blow off valve dumps the air built by the turbo when you close the throtle (so that it doesn't go back and hit the turbo blades). I think that is what you where describing, but just wanted to be sure you understood how it works.
The WGA works just like stated above, the presure in that vacuum line will build up and the sping(s) will only be able to hold it closed to a certain amount. After that amount of pressure, the waste gate will open and the turbo will not build any more boost.
So if your waste gate is "always open" then you will always be allowing the air to bypass the turbine wheel and you will never be building any boost. The WGA should be always closed, untill the boost forces it open with that pressure.
Just to be safe, check to be sure there is not always enough pressure in the line going to your WGA to open it, it should only have that much pressure once you are building boost.

 

[Turb07]

Wastegates work off of pressure!
Blow off Valves work off or vacuum!
Double check to make sure that everything is hooked up correctly! i would guess that it isnt and that is your problem!

just my $.02

Turbo