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Old 03-09-2003, 10:51 AM   #12
Austin
Scooby Guru
 
Member#: 7089
Join Date: May 2001
Chapter/Region: NWIC
Location: Western Wa
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The unmolested wastegate opening. You can see how much area we have to work with by the shiny portion of the sealing surface.


My final hole ID was 1.078". I removed .092" of material from the lip - about 2/3rds of what I could've removed. In my case, the flapper door didn't sit exactly centered on the opening - it sat a bit toward the outside (toward the pivot point) - so I concentrated more on that side of the hole.

There is considerable room for improvement besides simply making the opening larger. I rounded all corners and edges inside, and removed all flow trips to make a very low resistance path for gasses to flow through the wastegate.








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Last edited by Austin; 01-18-2004 at 05:30 PM.
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