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Flametrap? - Quick question before I proceed - K&N cont. kind of S80


I used to have an 850, and when I modified the intake I cut out the black plastic grid that was located in front of the MAF sensor. I found that this did nothing other than restricting airflow, and removing it had no adverse effects; on the contrary, it had a positive effect on performance.

I was not surprised when I found this on my S80 T6, and once again, cut out the black plastic grid in front of the MAF sensor. Once again, I found a performance increase, slight but it was there, with the stock air box.

What I am confused about, is that I can't remember if my old 850 had the wire mesh that is in front of the MAF sensor, that the S80 has behind the black plastic grid. What purpose does that wire mesh have besides restricting air flow? Can I remove it without worry? Is this the flametrap? Any help would be appreciated.

-J.P.








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    Flametrap? - Quick question before I proceed - K&N cont. kind of S80

    The 850/70 series turbo engines don't have a flame trap. The normally
    aspirated engine do and it is near the throttle body. I assume
    the 6 cylinder turbo engine is the same and you don't have a flame
    trap.

    I wouldn't cut anything around the MAF. It is a very sensitive part.
    Plus, the turbo sucks in all the air the engine can handle. A
    plastic grid won't limit air flow -- if it did the turbos couldn't
    build full boost (and they easily do).

    A MAF works by passing current through a wire. The air flow over the
    wire cools it changing the wires electrical resistance. This is used to
    measure the air flow and meter the fuel. It is possible the screen is
    there to break up the air flow a bit to improve the ability to meter
    the air that is flowing past. Maybe it helps at low air flow for better
    throttle respnse or maybe it helps at high air flow -- I don't know
    enough about fluid dynamics to guess past that.








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      Flametrap? - Quick question before I proceed - K&N cont. kind of S80

      I'm fairly sure the screen is there as a "last resort" type of filter. Essentially to prevent any larger pars of debris from getting sucked into the engine. The stock filter setup alows mice and or junk to get into the box however with a pod type filter (which i plan on putting in this spring) it eliminates the possibility of this large debris and the screen can be removed (see eastern areospace site).








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        Flametrap? - Quick question before I proceed - K&N cont. kind of S80

        The screen is put there because of the delicate wire that resides inside the AMM. It doesn't need much to break.







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