found crack in exhaust manifold...

[euro_urs4]

so i was changing out the wastegate spring in my urs4 back to stock (orginally had the 2.2 bar spring in there), since i was trying to diagnose why i cant hold boost, (where it kept spiking past the desired boost), after throwing the stock spring back in and unplugging the n75 connector, it still kept overboosting didnt make sence....

now i need your advice on this (correct me if im wrong ) but as i was changing out the spring i noticed the wastegate was wobbling a little bit, which isnt normal, i then took a small mirror and looked at it from behind and noticed that the neck from the manifold leading to the wastegate is cracked (still holding on but a descent size crack on it),

so now my question to you guys could this be the cause of me not being able to hold a steady amount of boost with the stock spring in and the n75 disconnected? or does this have no relation to this? thanks for the help

[Pirvu Eugen]

I dont think that is the problem.... I think you either have the N75 installed wrong, waste gate membrane ruptured or the wastegate stuck in closed position.

[UrS4boy]

N72? Did you mean N75?

http://members.shaw.ca/speedtek/UrS%...ice%20Map.html (Click on the N75 label)

Anyway, nothing on the exhaust manifold should wobble. If you wastegate is wobbleing it could be the source of your issues.

[euro_urs4]

N72? Did you mean N75?

http://members.shaw.ca/speedtek/UrS%...ice%20Map.html (Click on the N75 label)

Anyway, nothing on the exhaust manifold should wobble. If you wastegate is wobbleing it could be the source of your issues.

yes i ment the n75 connector sorry about that, and im going to check that my connections are correct and weld the crack on the manifold, since it could be both leading to the problem just wanted your guys opinion on this...