16g porting

[ecli1999gs-t]

Ok, I just got my 16g today and I would like to port it. I have an already ported out O2 housing and tubular mani from eBay (don’t ask me why, It was used and cost me $60 shipped. I do however need to port it to match the gasket and I’m hoping it'll be better then stock). My aim is to eliminate boost creep as I would like to push around 20psi. Here are my questions:

1.) The turbine housing that connects to the mani is about 6cm. All I’m going to do is remove the step and the wall that blocks the wastegate exit. I don’t want to port to much because I’m assuming that it was engineered with that unique curvature for a reason.

2.) The turbine exit that connects to the O2 housing is about 6cm. However, the ported O2 housing is about 6.5cm. Should I port to match? I’m afraid to port that part because it looks as if it should remain untouched (hopefully u guys understand what I’m saying. The turbine wheel is close to the housing and I’m assuming it should remain that way). Or can I port it but don’t go too far down towards the turbine wheel.

3.) I am not upgrading to a larger flapper. I will however be porting the contours of the flapper area so it will match the ported O2 housing.

4.) Lastly the compressor housing exit is smaller then the gasket and my j-pipe. Is it ok to port this exit to match? Again I don’t think I should go in too far in order to maintain the curvature.

Thanks a lot!

 

[fwdmaster]

Just port out the step of the 6cm to 7cm, and port out the wastegate area so the flapper can open all the way

 

[Mr Peepers]

Ok, I just got my 16g today and I would like to port it. I have an already ported out O2 housing and tubular mani from eBay (don't ask me why, It was used and cost me $60 shipped. I do however need to port it to match the gasket and I'm hoping it'll be better then stock). My aim is to eliminate boost creep as I would like to push around 20psi. Here are my questions:

1.) The turbine housing that connects to the mani is about 6cm. All I'm going to do is remove the step and the wall that blocks the wastegate exit. I don't want to port to much because I'm assuming that it was engineered with that unique curvature for a reason.

2.) The turbine exit that connects to the O2 housing is about 6cm. However, the ported O2 housing is about 6.5cm. Should I port to match? I'm afraid to port that part because it looks as if it should remain untouched (hopefully u guys understand what I'm saying. The turbine wheel is close to the housing and I'm assuming it should remain that way). Or can I port it but don't go too far down towards the turbine wheel.

3.) I am not upgrading to a larger flapper. I will however be porting the contours of the flapper area so it will match the ported O2 housing.

4.) Lastly the compressor housing exit is smaller then the gasket and my j-pipe. Is it ok to port this exit to match? Again I don't think I should go in too far in order to maintain the curvature.

Thanks a lot!

First off, boost creep is a problem at lower psi. For example, if you try to run 10 psi it may creep to 20 psi by redline. If you try to run 15 psi it may creep to 20 psi by redline and so on. But, if you run 20 psi you won't see any creep- this is just an example.

20 psi is usually the sweet spot, and you may not have an issue; at least not as much as people trying to run 10-15 psi.

1) This is the common porting method when you no longer use the sealing ring. You should be fine, just keep everything well blended and don't go all the way into the volute like you said, unless you were just cleaning up the surface. Radius the top of the WG entrance, keep the bottom sticking out to "catch" the exhaust flow.

2) Yes, you can port match the turbine exit to the o2 housing, just don't port near where the turbine blades are next to the wall. Try to keep it as gradual of a transition as possible.

3) Not really a question but yes I think it's a good idea; can't really hurt.

4) Yes, port this to match. Keep it gradual but don't go too far. There is about an inch before there is a "split" in the casting.

Good luck

http://www.dsmtuners.com/forums/turbo-system-tech/290438-rate-my-porting.html -Similar thread with some info you may find useful.

By the way, the flapper never opens past 45* with a stock wastegate actuator. The actuator will be at it's full travel before the flapper hits the wall.

 

[ecli1999gs-t]

wow. thanks a lot guyz.
I now understand the boost creek not being a problem at high psi. But i would like to port in case I do wish to lower the psi in the future.
thanks again, i freakin love this site.