Porting turbine housing, not flapper or inlet

[Dream On]

I have never found any posts here about porting the other exit on the turbine housing. I wondered if it was bad to port it or not. I have my turbo apart and have ported the turbine inlet and the wastegate area, but not the other exhaust exit. I'm not talking about the passenger side of that connects to the compressor housing, but the bigger hole on the other side next to the wastegate arm. If this is hard to visualize, I'll try and find a picture of what I'm talking about.

 

[thekellbeast]

Do you mean the main exhaust exit that goes into the O2 housing? If so, I've seen people port that out, up to 3" for matching an exhaust system.

 

[Dream On]

Yeah, I have heard you shouldn't touch the other side, but I wasn't sure if porting the o2 housing side was ok or not.

 

[CanadianTSi]

Most Exhaust's start at at 2.5" anyways so there really isn't a point.

 

[Dream On]

I ported my o2 housing a little bit though, should I just make it match that?

 

[thekellbeast]

Just match it to the gasket, which you should match with your O2 housing (stock or aftermarket). The whole point is a smooth transition from the turbo exit in to the O2 housing. As long as those match up, you're fine.

You should only really have to port it out a lot if you go crazy and port out the O2 housing completely.

 

[Dream On]

I chose not to open that side of the o2 housing up a whole lot. The side connecting to the downpipe was enlarged quite a bit though. Thanks for the info guys.