I am not responsible for anything. If you screw something up, it is all on you. I am definitely not a professional, and will not be held accountable for anything you screw up.
With that said:
How to: Port your turbine housing
This was done on an exhaust housing from a 16g. The process will be very similar for other turbos. And some turbos will not even require porting because they already come ported, or they are just designed correctly already. (think FP)
Tools Needed:
Die grinder (electric or air)
If using air die grinder: You will need a LARGE air compressor. LARGE.
Don't even think about attempting to even think about thinking about
thinking about porting if you have less than a 10gallon air compressor.
Hopefully your air compressor can push some serious CFM AND have a big
tank.
Carbide burrs
Without these you will not be able to port either. Try and find some BIG ASS carbide burrs, as it can help speed up the process quite a bit.
Wire Wheel
Sanding drums (these can either work on your die grinder or your dremel, you choose)
Sandpaper (220grit, 320grit,400grit, 600grit, 800grit, 1200grit, and 2000grit)
Meguiar's Mag and Aluminum Polish
Estimated Time: Unknown?!?! Depends on you, your tools (size of carbide burrs and size of air compressor, etc.) But I can tell you it will take a while. Don't expect to be done in a couple hours, LAWL.
Step 1:
After your turbo is apart, place exhaust housing in vise.
You can now start grinding down with your carbide burrs trying to eliminate the "lip" that is present. Some people also like to "gakset-match" where you take your new exhaust manifold to turbo gasket and port match it trying to make the inlet and gasket the exact same width. Either will work, because basically after taking the lip away you are left with a 7cm ring anyways.
and starting to take away the lip
After making everything even with the newly eliminated lip, go ahead and focus on porting the area around where the wastegate flapper inlet is. Try to make it to where the air doesn't have to turn so hard to go out. Make it smooth.
When finished, take out your wire wheel and try to smooth everything out some.
It should now look similar to this:
Now, take out your sanding drums and your dremel or die grinder and start sanding to make everything smooth. This will take a long time and you will probably need to use multiple sanding drums. (I know I did. I broke 2 of them, and 2 more got very very worn out)
When done sanding, get all those sandpapers that you bought earlier and start wetsanding starting at the lowest grit for a few minutes, and switch to a higher grit every few minutes till you get too 2000 grit.
Rinse out the housing with water to get all the crap out, and let dry.
Now take out your polish and read the instructions on the back. Apply the polish. Let the polish be on for about 5 mins, then buff it off using a microfiber towel or similar.
Your turbine housing should now look amazing, and will now perform much better. Your turbo will spool a little faster and you will have less chance of boost creeping.
These pictures aren't the final product, but just to give you an idea what the finish will look like...
I also ported my compressor housing since my RRE J pipe's hole is ginormous. (using the same process)
Before and after:
This has been a 7inchexhaust writeup®.
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