Originally Posted by illinipo
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.
I dont buy all of that , the boundry layer will only be higher IF it is effected by placement of a turn before or after the MAF , If there is enough distance this wouldnt hold true , I dont feel it makes the tube seem smaller or that the air is moving any faster through the tubes then with suckthrough but all of this will depend on how the piping is made , amount of turns , distance from MAF to the closest turns