Ok, so i have a turbo d16z6 pfab log manifold and an electronic ectune boost controller. Boost cut is set at 15lbs of boost. My last wastegate was a crappy emusa 38mm vband, and the motor was pulling 15lbs of vacuum so we narrowed it down to the wastegate leaking somehow. so it would hit boost cut every time. Its not the diaphram that was leaking, it was leaking between the bottom port on the wg and the valve...ok...so i buy a Tial 38 vband wastegate brand new put it on and this one is doing the same thing! I have read that Tial purposely makes theirs leak a very very small amount betweek the valve and that bottom port but idk if that just a load of bull or what. So I just decided to completely take the boost controller completely out oc the picture, just hooked a vacuum straight from the intake manifold to the bottom port on the wastegate and still hits boost cut. Any ideas would be greatly appreciated thanks in advance, David

 

also, the spring in the wastegate is a .5 bar (7.3lbs) so that is where it should stop if it was functioning properly

 

Are you running a downpipe?

 

Yes, full 3" down pipe straight back to a vibrant 3" muffler.

 

pic of the setup, what size turbo, who tuned it?

 

try running the bottom wastegate port vacuum line to the cold side charge pipe before the throttle body and see what it does

 

Dk goodrich initially tuned it on ectune up in KY but its been funny because we tuned it on that crappy wastegate, so I bought this new one and brought it up to Adam Hopkins here in murfreesboro who does ectune as well and we couldnt tune it due to the boost creep. Hits 15lb boost cut every time. The turbo is an ebay 57 trim t3/t04e. I know...i will be purchasing a precision sc50 soon but i dont think the turbo would cause the issues I'm having. Its in good shape and everything. I'll post pics here in a few

 

This is how I had it set up before i tryed running it straight to the intake.

From the bottom port of the wastegate I ran it to the compressor side of the turbo.

Top port ran to the one side of the boost solenoid

Othere side of the boost solenoid was t'd into the one that ran from the turbo to the gate.

You think i should just run one straight from the compressor to the bottom port on the wg and see what she does?

 

does it creep with the boost controller dissconnected ?

 

sorry for the cell phone pics but as you can see my bottom port is going to the turbo and then that tee goes to my boost solenoid the other side goes to the top port on the gate

 

yes, I completely took the boost controller out and ran it straight to the Intake manifold same thing. went straight to 15lbs and hit boost cut

 

If your wastegate isnt opening then its not seeing boost pressure in that line. when you took off the solenoid did you plug that line or let it stay open free?

If you have a solid line from wg to boost source and its not opening the WG then you have the wrong spring of there isnt any boost rpessure making it through the line to the wastegate for whatever reason.

 

i mean i took the boost controller out and hooked my wastegate straight to the intake. I'm about to try running it straight to the compressor side of the turbo and see what happens

 

if you ran its straight to the intake and its still overboosting then the wastegate isnt opening. it might have the wrong spring in it

 

when i took off the solenoid i just left it open

 

i just ran the bottom port straight to the turbo, no boost control and still same problem. I know theres definitely boost being made to that line so it has to be the wastegate....I dont see how Tial doesnt test their products before they send em out. I'm disapointed because i paid 260 dollars for a quality product and it doesnt work at all

 

Sounds like you have the wrong spring, or your line is clogged. 99/100 times when you replace a part for a certain problem, and you still have the same problem. Then it wasn't the part.
You do have nothing connected to the top port correct? And have a straight hose from turbo to the bottom port on the wastegate?
Disconnect the vaccum line at the wastegate and rev the engine and make sure your feeling air (vacum line is not clogged).
Also make sure your dumptube is not restricted.
If thats all good pull out the spring and make sure its the right one.
If thats all correct then your just an unlucky fool with two bad wastegates.

 

Or the line is too long, possibly collapsing. From what I can see that bottom port vacuum line tee's off and runs ALL the way around the cylinder head into the compressor cover.

 

no no, that line in the last picture that is teed off, the one that runs down and to the left goes to my wastegate, the other one that goes off to the right goes to the other side of my boost solenoid. I know its not the spring because when my tuner tryed to tune it we had boost cut set at 29lbs i believe and it hit boost cut...how am i supposed to tell if i have the right spring in there?

 

Boy that's a mess in there. The only way to tell is to remove the spring (if it is a TiAL gate) and compare it with the color chart on TiAL's website.) if not, not sure in that case.

Failing solenoid? no punctures or anything in the lines? possible line collapse?

 

i just took it for a test run boost solenoid is completely disconnected not running to anything. ALL i have connected is one brand new 7/16 vacuum line running from my wastegate to the compressor housing. boost cut. i'm going to pull the spring out right now and see what color it is

 

I know you live a little bit away, but if you need help, I'm here 7 days a week.

 

so I just took the top off of the wastegate and I have a large blue spring. its like a light blue AND a small bronze looking one idk if thats supposed to be green, but according to ials website large blue is 14 and small green is 7.2......so what the hell now?! lol should i try putting one spring in and see what it does?

 

i have 1 yellow spring in my tial 38mm

also if boost cut is an issue why not just go in and adjust boost cut

 

Thanks buddy, man u know we tryed all kinds of crap to get this thing going and i think the reason we had probs was cuz of that wastegate...and now apparently the dealer that sold me this brand new tial was lying or didnt know his stuff........i guess i'm gonna try putting this small spring in it and see what happens