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as soon as I get my kit installed and after NOPI it will be getting extensive time on my DYNO. Free Dyno time is a dream and I will be posting a lot of info for the community.
Little update on my install - made an airbox/heatshield. Concentrates the air from my NACA duct on the filter and keeps radiated heat from the header away. Saw another small drop in IAT and am now getting a solid +1 pound of boost. At this point I am not sure if the cooler air is resulting in the increased boost or if I am building a positive pressure in the airbox area - need more testing. Could also be the new filter - is actually just slightly smaller than the previous one, but it is supposed to flow 20-30% more air than a similar sized standard filter(according to the boys at K&N that I talked to).
There are a couple of reasons you are now getting more boost
Mass flow at an inlet of any compressor is a critical factor in determining how much "boost" but more importantly how much mass flow can be force into the motor.
Mass flow (temp) into a belt driven supercharger is a critical factor in determining its over all effectiveness. With a turbo it just increases it rotational speed to compensate for the mass flow inlet temp to get the desired output boost pressure mass flow this can not be done very easily with a roots so the colder air you can feed the inlet the better.
Main thing here is the increase in air mass flow rate due to the cooler intake temps.
Now if your air filter is able to flow more mass (less restriction) while still filtering the correct amount of particle out of the air then there is where another increase in mass flow in is coming form.
Another point is since the air coming in is colder the final air temp after compression is lower and there you have another increase in density.
In this case more mass flow in = more pressure and more mass flow out pre unit of air and colder IAT with more ignition timing.