Porting 6cm housing

[16GTSI]

I've searched this site, vfaq, and google and cant seem to find any decent information on porting the 6cm housing. Using the 6cm housing on a big 16g for a quicker spool but i want to open it up a touch to increase some top end as well. Can any body post up some helpful information or links please?
Thanks in advance
Ryan

 

[jbillakdsm]

Well first thing to do is to pull it off the car and pull the turbo apart. Next, take it to a machine shop. If you get a quote and it's more than 2 hours of labor take it somewhere else. It's not that hard for a real machinist to do this. What you do next depends on how much larger you want to go. If you only want to go a little bit, I would use a jig grinder to bore it out and leave a nice finish behind. If you want to go larger like around 7cm, I'd tell them to use a boring bar to get most of the heavy stuff out and then a jig grinder to put a finish on it. Using anything other than a machine will give you imperfections all over the place and this is not an area where you can accept them.

 

[Tallen]

Match both gasket surfaces to the gasket. Do this by grinding off ledges or any left over material.

Furthermore, you have a FWD. Spoolup is your enemy...leave the b16g alone!

 

[kpt4321]

If you have a 7cm housing around, then use it. It's not worth the slightly faster spool for the slight decrease in top end.

I wouldn't bother porting anything but the wastegate inlet and outlet, which are both outlined in the VFAQ.

Boost creep is evil.

 

[16GTSI]

Yes the car is FWD. I got the turbo from Machv without the turbo housing so thats why i am using the 6cm. I already got my 34mm flapper and have begun to port that area. I just wasnt sure if i could port the housing part, have it machined, or just leave it alone.