Quote:
Originally Posted by stormcrow
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.  |
That is absolutely what Nissan told us. Also a little FYI, one of the top tuner's for Nissan/Infiniti (UPrev) also recommends using a draw through MAF setup.
In regards to the car stumbling on its face with a blow off valve. You are correct...and incorrect...We are going to be using the Turbosmart blow off valve which is a two stage blow off valve. If you're simply driving around a parking lot then it will re-circ back through. When under hard driving it will blow off into atmosphere.
I might not be a tuner but I'm also not an idiot...I understand that by removing the metered air from the system that the car could potentially stumble and possibly die because you're taking the air away after it has already been metered...Don't need to be a tuner to understand that. I actually addressed this same question in the technical discussion thread.