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Originally Posted by twiceblown
Also, it's interesting to note that you SHOULD NOT increase the size of the flapper on a TD04!!! Ideal spring pressure increases greatly for minor porting of only 3mm!!!
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I came to that conclusion before doing the math. It's only obvious. If your turbos don't boost creep, you don't need larger wastegate passages. Enlarging the wastegate passage/flapper has one purpose, and makes no sense to do until you have a specific problem to fix.