Built in wastegate question

[chris9149]

Ok so I searched around a little and didn't find what I was looking for so I figured I would ask.

The quick question goes like this:
I want to know if the arm going from the intake side of the turbo to the exhaust side of the turbo controls the built in waste gate and if it does (I am pretty sure that is what it does) should I be able to move it by hand?

The longer story goes more like this, if you are interested:
I recently got a 1g talon and I am in the process of trying to clean it up and get it running right. I am doing all my maintenance right now (plugs, wires, filters, flush radiator, check belts...) and I have the radiator out while I had the system drained. am just cleaning up the dirt and grime that is covering everything in the engine bay so that I could spot any possible leaks and also to improve the aesthetics a little when I started looking at the turbo. I was checking out the arm that goes from the intake side of the turbo to the exhaust side (which is the internal waste gate control if I am not mistaken) and I noticed that it does not move. To my knowledge (which is limited) that should move back and forth to open and close the built in waste gate, right? If it is supposed to move I am thinking maybe that has something to do with why my boost is so high (at least it seems pretty high to me, 15psi).
Anyways any input on this would be appreciated.

Also, here is a picture of the arm in question, just in case I am not describing it well enough.
<a href="http://www.flickr.com/photos/chris9149/2721354824/" title="Turbo by chris9149, on Flickr"><img src="http://farm4.static.flickr.com/3200/2721354824_662e8714aa.jpg" width="500" height="375" alt="Turbo" /></a>

 

[nfernotalon]

Yea it moves with quite a bit of pressure try pulling on the arm with some pliers but dont bend it also blow some air in the nipple with a compressor and should open.

 

[nfernotalon]

looks like you have a T25, do you know why?

 

[chris9149]

I have no idea. Like I said, I just picked the car up last weekend and really haven't been able to look at it or drive it because of work and my lack of registration (long story).
Would me having a T25 be the reason that I am running higher boost pressure than I thought I should be? I will go look at the numbers on the turbo and check what it is and verify what I have.
Thanks for the info on that bar.

 

[PIMking]

T-25 is the smaller turbo from a 2G I think.

 

[talonDSMerr]

That's weird, why would anybody go through the hassle of putting a T-25 into a 1g.

 

[nfernotalon]

The t25 is crappier than the 14b, I suggest you get a 14b

 

[MrBoxx]

It may be a T28, which is nearly identical to a T25. If you had compressor wheel measurements, we could tell for sure.

The wastegate actuator arm does move, albeit with a lot of pressure and not very much lateral motion. If you run a vacuum line directly from the turbo compressor housing/IC pipe to the WGA nipple, you should ideally get about 11-12 psi boost (wastegate pressure). From your pic, it looks like you have a tee fitting in that line, but I don't know where the other end of that line goes to. Hopefully not the BOV line. If it goes to the BCS, it's probably hooked up incorrectly.

 

[chris9149]

There is a T in there. The one end going away from the turbo (not the one routed under it) goes to the intake. I dont really understand how that could ever build up presure when the one end goes to the intake pipe, right by the actual filter, wouldn't any presure be lost to the air? I will have to read up on how it is supposed to be hooked up and make sure it is right I guess.

 

[MrBoxx]

For now, just run one line directly from the turbo compressor housing to the wastegate actuator and see what boost level you get from doing that. It should be right around 12psi or less.

 

[chris9149]

OK, I'll try that out, what does the line going to the intake do though?

 

[MrBoxx]

With the stock BCS hooked up, the intake nipple allows the air from the BCS/WG/Turbo system to bleed back into the system, negating the effects of a boost leak. With an MBC, that air is bled off into the atmosphere, causing a small, but intentional, boost leak. (Don't forget to cap that intake nipple when you put an MBC on.) With a direct line from turbo to WGA, the WG just operates by spring pressure. Until you get an MBC, this is the safest way to go.

 

[chris9149]

Alright, thanks again.

 

[MrBoxx]

No problem. What I'm here for.