DIY downpipe opinions
#21
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Im not saying youre wrong brain, but the theory behind the quick step up to 3" is completely in line with what you posted about turbulent and laminar flow. It is basically making the assumption that you will get higher velocity from turbulent flow than you will from laminar flow that is rotating through the downpipe at a really shallow angle.
It may not be true, or the benefit may be totally canceled out by stepping back down in diameter, but I dont think anybody can really say for sure without testing.
It may not be true, or the benefit may be totally canceled out by stepping back down in diameter, but I dont think anybody can really say for sure without testing.
#23
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all I care about is evacuating the exhaust gasses as quickly and efficiently as possible. This means doing whatever it takes to get gasses away from the turbine, so it uses the least amount energy having to push gasses away and more on spinning.
#26
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It's not about turbulent flow versus laminar flow with regard to the quick step up coming out of the turbine, but radial flow versus turbulent flow. What you do after that is your business. Obviously, keeping the larger diameter would be optimal but having a larger diameter versus not having it seems to make a difference at the outlet. But I don't know anything other than the stuff I read here and there. I have seen that radial to turbulent explanation somewhere else many years ago, too.
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