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Old 10-03-2013, 02:51 PM   #10
Scooby Newbie
Member#: 315692
Join Date: Apr 2012
Chapter/Region: MWSOC
Location: Minneapolis, MN
2005 WRX STi


Originally Posted by Mr Wrex View Post
In summary, you will only flow as fast as your smallest part will allow you to.
This is not true.

The goal is to minimize the pressure drop between the inlet of the intake system and the turbo. To find the total pressure drop you sum the pressure drops across each component. A 3" hose will have a slightly smaller pressure drop for a given mass flow rate compared to a 2.4" hose, as the velocity will have to be higher to maintain the same mass flow rate. Velocity=frictional losses within the fluid. So even if you flow through a 2.4" orifice (the compressor housing inlet) in both cases, you will still have a higher total pressure drop using a 2.4" hose. In reality the difference will probably not be noticeable though.
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