Focus Fanatics - View Single Post - Tuning for 3" MAF housing
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Old 05-13-2010, 10:52 PM   #15
illinipo
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Quote:
Originally Posted by tb1999 View Post
I'm curious, why is that so?

I thought that since the MAF hotwire will cool off proportionately based on the density of the air etc, that having boost flowing through it versus air at near atmospheric pressures would be irrelevent?

I don't doubt you, I'm just trying to understand why....
While you have the theory right, reality doesnt always match the books.

Theres also a lot of difference due to the filter turbulence in drawthrough vs nice straight tubing in blowthrough

Plus with a higher reynolds number due to higher velocity in drawthrough, the boundary layer will be higher off the tube wall, effectively making the tube even smaller and making the air go even faster.
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