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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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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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Interesting my (versa note) tried to put a custom intake and the car would not idle...

3" maf adaptor with inlet reduced to 2"
2" from intake port (throttle body) to maf adptor to a 3" filter... Car just stalles
 

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The area and structure around the MAF need to be identical to what came off. The MAF is VERY sensitive to flow changes and will throw metering off wildly if placed where the flow changed.

Past that any leak past the MAF in the duct is an unmetered air (vacuum) leak.
 

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The area and structure around the MAF need to be identical to what came off. The MAF is VERY sensitive to flow changes and will throw metering off wildly if placed where the flow changed.

Past that any leak past the MAF in the duct is an unmetered air (vacuum) leak.
^^this.

As for a true cold-air setup on a Versa, the best bet is likely to start with a performance intake with an existing MAF plate and go from there, or modify the OEM intake (since the only aftermarket options currently are all SRAI, or Short Ram Air Intakes). I've tossed around the idea of using a HPS ram intake as a base, keeping the existing coupling and elbow tube to the throttle body installed, but then adding onto it.

It could be done, and the factory intake ran in front of the battery down to in front of the fogs on the drivers side.

But there's a lot more to take into consideration, especially water consumption, a breather box, etc. Because of the battery design, a true cold air intake would work best if it traveled either over the top of the battery, or through it (battery relocate). I met a 2nd gen sedan Versa owner years ago that had somehow managed to make a DC Sports CAI from a 1st gen hatchback fit his with minimal modification, and a new silicone coupler. In front of the battery, space is very limited and the stock intake tubing was much smaller than the HPS aluminum piping.

Bottom line...we're Versa owners. Little or no aftermarket support means it's time for us to get creative! 😈
 
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