Cracked wastegate/exhaust housing???

[evotuner]

I have a problem! No matter where I set my mbc, I can only boost 12 lbs, until I reach about 5k rpm, then basically my boost gauge increases with my rpm's. I have had this problem for a few weeks, and I am guessing the turbine side of my turbo or wastegate housing is cracked.
Any ideas? It drives fine, just have to watch the boost!

 

[jbillakdsm]

Sounds like your housing split right where your flapper is and the crack is big enough that it can't hold back enough gas. I'm starting to have a similar problem with my car and I know that my housing is cracked. I'm just going to find one that isn't in bad shape and have a friend who is a welder repair it till I save enough for a turbo upgrade. The only other thing I can think to do it is to pull the housign and check it out. If the split isn't too bad, you might be able to get away with getting a flapper upgrade and porting out the wastegate to cover it.