Originally Posted by wicked2t
The AEM FIC is still pretty new on the market. Its a great system, the only down fall is that it requires your factory MAF out of boost.
Actually, it reads the MAF at all times- in and out of boost. It just applies a different multiplier when above atmo.
At any rate, I'm pretty sure that Braineack is on the money here. Compared to the old mechanical VAF sensor, the hotwire MAF just doesn't look all that restrictive to me. It's got a pretty big open area, and where obstructions do exist they appear well-streamlined.
If you want to do some interesting research on the dyno, build yourself a simple liquid-column manometer by taking a length of clear plastic tubing, forming it into a U-shape, and putting some colored liquid into the loop at the bottom. Attach one end to the intake just before the MAF, and the other just after the MAF. Under load, the pressure differential across the MAF will be visible in inches of rise, and from that you can calculate the pressure drop. (This is literally where the terms inches of H2
O and inches of Hg as measurements of relative pressure come from.) I'm betting the drop across the MAF is pretty minimal.
Do the same thing with one end hooked up between filter and MAF, and the other exposed to atmo, and do an A-B comparison of two filters vs. one. Assuming the one is reasonably sized, clean, and in good condition, the difference should be close to zero.