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03-09-2003, 11:51 AM
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
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