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Discussion Starter #1
I've been fooling around making my own intakes for experimentation and just want some input from experienced DIY'ers around here (few and far between here, i know) on what has worked best for them.

MAF placement-some models seem to be very fussy about MAF placement, i would think the best placement is halfway between the filter element and the throttle body, preferably in a straight section of piping. In the Versa engine bay this can be done quite easily.

Piping size reductions/increases-as far as i know, any diameter change will negatively affect flow and volume, i am thinking it is best to keep the intake piping the same as the MAF sample tube diameter, with tuning software you could theoretically calibrate your MAF for any diameter, but that is not easily accessible yet, though UpRev has had the ECU cracked for a while AFAIK, but the main disadvantage is the coin required for on the fly tuning, with only marginal gains likely


Most of the aftermarket intakes for these use a larger pipe diameter before and after the MAF, which to me offers no significant benefit, the MAF sample becomes a textbook definition of a venturi, to me this would affect response and overall driveability for the most part.


Does anyone know where i can find plastic thin wall piping? I am using 3" ABS pipe right now, and not only is it very thick wall, i can't find 2.5" ABS pipe locally. I have "bell mouthed" the ends of the pipe i am using to reduce flow impedance as much as possible, but i think 3" is excessive and hurting driveability/overall response, motor bogs down at WOT until 2500, very annoying.
 

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Discussion Starter #3
Well i start at sample tube diameter, it's i believe 2.5" on the airbox side, and 2 3/8 on throttle body side. I cut the sample tube out of the airbox myself, did a bit of trimming up and it's good. I checked out Airraids "U Build It" but the smallest is 3". I may have to use universal aluminum intake piping but i prefer plastic due to the fact that it doesn't become a heatsink, and it's lighter.
 
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