Aiight, went back and tightened up the manifold and turbo nuts and bolts, and also run 2 springs instead of 1, ran str8 to the wastegate and got the same results (30+ psi). Blue91lx, which vac lines were switched when this happened to you? I'ma go back and look over the vac lines again in the morning but it would help me alot to know which one's gave you this problem.

 

Ok your running from the wg to where? Are all your other lines ziptied shut?

 

Went back and checked the vac lines. A EGR hose popped off so i reconnected it, zip tied it and the same sh*t still happens. Everything else was connected. I even reset the ecu and nothing changed. I'm running the wastegate to the Intake Manifold-BOV line.

 

Have you performed another boost leak test? Maybe more than one hose popped off.

 

I'll try another one, helpfully it'll point me in the right direction.

 

Running a vac line straight from your turbo boost source to the side port on the wastegate would eliminate the boost controller being an issue as it isn't part of the equation anymore, so you have the right idea. I would run it from your turbo instead of the BOV though. This is how I have mine run and it works fine. This would also eliminate any other vac line with a leak causing your issue.

One thing that could cause overboost would be if the vac line running to your wastegate has a leak in it. You don't want any pressure escaping between your boost source and your wastegate as that is what triggers your wastegate to open. Also make sure there are no kinks in the vac line. The only other thing I can think of is there is something wrong in the way your wastegate is routed to your O2 housing or something wrong with the wastegate itself (sticky). Is there a way to verify the spring pressure? I am not sure how the double springs work as I only have a single (~13psi). Is there a way to just use the smaller spring? With my ~13psi spring and a Hallman, I am still able to hit 35+psi.

 

How long are your vacuum lines from the wastegate to the Boost controller? I just read you ran straight wastegate and it still happened but if you used the same long vacuum lines, it'll overboost because it makes the wastegate react slower. Here's what happened on mine, its not too big of a spike, but still there. Look at the middle lines, ones dotted (long vacuum lines to the MBC) The solid one is it being shortened:

 

The dual springs go as followed one smaller and the other one overlaps it. which gives you the extra strength for the stiffness of the spring. It is like dual valve spring kinda thing. What he is suggesting is he is making more boost then what he wants to. All the 2 springs will do is keep the wg closed longer to make that turbo spin faster and keep the power in the system longer without venting it off. But as frustrateing as it is, I still think there is something hooked up wrong being he is still hitting 30 psi no matter what. Fre you said something about the line possibly haveing a leak in it and I would agree with that, but he said he did a boost leak test and found nothing, but yet he found the egr line popped off which the boost leak test should have found so Idk. My thoughts were maybe he had his lines mixed up or his mbc hooked up incorrectly, something doesn't make since.

 

That's interesting thanks for shareing that. Ya know I am wondering too if the vac lines are collapseing on themselves? What do you guys think?

 

But your putting boost through them at that point where you think it's failing not vac

 

So if the springs are concentric like they are with valve springs, then couldn't he just try running the smaller one instead of the bigger one? With boost leak checks you have to be careful as sometime small cuts don't always pronounce themselves. I would take the vac line you use between your turbo boost source and wastegate and bend and flex it and search for small tears or just replace it with a new one to be certain.

My vac line controlling my wastegate is like 3'-4' long probably.

 

yeah thats true

 

Collapsing? They're usually under pressure not vacuum. I think he has something hooked up wrong or his mbc isn't turned all the way out.

He needs to be using soapy water during his boost leak test to make sure he finds all of the leaks.

 

Yes he tried that and it did the same thing.

 

yeah I thought that all along.