Oldman could you "grade" my porting?

[DSMunknown]

God, I hate porting.

 

[romeen]

Well, if you conside this [........] area to be the area where the fins sit inside the exhaust housing I went about this far.... [........|..] past the fins INTO the exhaust housing. With the right portion being where it exits to the o2. And I just smoothed it out. Do you think that's too terribly bad?

The tolerance between the turbine fins and the wall of the turbine housing is very precise and altering this may cause suboptimal flow. I'm not saying that it won't work now but you would have been better off leaving it be.

My guess would be that it may slow spool time by allowing some of the exhaust gas to go around the turbine instead of "through" it. I suppose one could argue that it may cause less backpressure at higher rpms but that is just speculation.