03-17-2010, 12:32 PM
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#11 (permalink)
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Enthusiast Member
Join Date: Jan 2010
Location: Alpharetta, GA
Posts: 267
Drives: 2010 370Z Nismo TT
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Quote:
Originally Posted by Kyle@STILLEN
When we say that Nissan recommends a draw-through setup we're not just using other vehicle's as examples, we mean that their engineers told us that the O.E. MAF sensor is not designed to be used as a blow through. We have a very good releationship with Nissan North America and we do talk regularly with their engineering team and this is what they recommended to us.
The NISSAN MAF sensor is not designed to read the air blowing over it because the sensor can not read air density. It only reads air volume. If you compress the air through the compressor then blow it through the MAF sensor the MAF is unable to read all of the air going by it so you're not getting an accurate measurement of air. Again, this information came from Nissan.
Yes, in order to achieve CARB legality we can not vent to atmosphere so we must use a recirculating by-pass valve. However, a blow off valve could easily be adapted to the kit if someone wanted that.
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Wow, man. Either Nissan fed you some misinformation or your engineers misunderstood what they were told. Nissan uses a 'hot wire' type mass air-flow sensor which most certainly does measure the density of the air. It does so by denser air causing a temperature drop or pressure drop. This, in turn, requires more voltage from the hot wire to equalize the intake temperature with the temperature of the hot wire itself. Nissan is not using a 'vane meter sensor' which would measure only air flow instead of air density and flow.
The reason Nissan uses 'draw through' on the OEM turbo cars is for longevity of the MAF. That and because a MAF in laminar air flow is much easier to tune. Granted, 'blow through' designs will certainly diminish the life of the MAF, but not drastically.
BTW, if anyone decided to adapt a BOV to your kit, the tune would fall on its face and the car would probably not even idle. "Draw through" MAF setups do not allow for anything but recirculation. You are not a tuner, so I will let you have a pass on that one. But, I certainly wouldn't recommend it to your clients. 
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