Quote:
Originally Posted by ciro
The smaller the diameter the higher the flow but less volume. The trick is the balance between the two. You need to have a length in mind. So for example for a UEL header the shortest length should be the largest diameter and the longest length should be the narrowest by theory. In practical it is the average length that you should use to calculate the diameter to get a good overall idea of where to start. Lots of headers for turbos are generally more narrow then NA headers.
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This is exactly what i'm referring to. The issue is which diameter will be ideal for spooling a specific turbo