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Power Strokes
7.3 Aftermarket
When is 4" exhaust not enough??
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[QUOTE="TARM, post: 60314, member: 578"] I think what is going to be found out is that a tight 90 degree turn creates considerable restriction. Without a increase in down pipe size decreases in pressure at the turbo outlet will be negligible would be my guess at what will be found. In doing some reading in a few turbo books etc it seems the ideal shape at the turbine discharge port is bell or trumpet shape then continue that size on out. The reason stated for the shape is to cause a break up of the flow to create less back pressure. How I saw the examples assuming a 4" discharge port would be to flare up to 5", then in our trucks, turn down the 90 and on out the back. Issue is room. Maybe it can be done with a 3" body lift. [/QUOTE]
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When is 4" exhaust not enough??
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