Installed Tial 40mm wastegate and not boosting

[uniqbboy]

I own a 95 eagle talon and i have installed a Tial 40mm hp wastegate a few day back and i have a problem. The car is not boosting. first I welded the flange on the O2 housing i took of the internal gate of the turbo but i have left the Flapper inside not sure if it made difference. Than i have a joe p mnbc so i conected the it to the side port of the wastegate and left the top venting. Problem is i don't boost, well not exactly it boost very slowly and only till 12-14psi max. First thing that i checked for was boost and exhaust leaks. That checked out. Than i checked if i installed the ring on the wastegate correctly and that was correct too (flat part on the outside rounded one in the middle. I am fresh out of ideas what is wrong. Please help any advice will be appreciated. thanks

Alex

 

[uniqbboy]

Ohh yeah i have a 1.1 bar spring inside of it. But no matter how much do i crank the boost up it build up. thanks

 

[TwoLiterV8Eater]

Did you weld the flapper door shut on the internal gate? If not thats where all your boost is going. At least that is my understanding of it anyway.

 

[uniqbboy]

Actually what happened i stayed up all night last night getting this thing on. And in process of installing it i forgot to do one little thing. See you are on good track when saying i was supposed to weld the flapper shut only thing being is that my wastegate is behind flapper on the O2 housing. So I will have to block of O2 housing channel behind the gate. I was so tired last night that i totaly forgot to that. So all the exhaust gases would go by and wouldn't let the wastegate build up pressure. It took me awile but i figure it out. Thanks for posting especially since u were the only one willing to help. thanks man. later

Alex