|
Regarding so called heat shield:
It's commonly misunderstood that carbon fiber provides good heat isolation. In reality, neither plastic nor carbon box heat up the air going thru it, because flow rate is way too high for heat diffusion - the physical contact type of heat transfer. It all comes down to where air comes from. The coolest would be a "front facing" duct, the type you often see with aftermarket superchager kit (check out these E90X M3 blowers). But due to air hitting filter hard, it protects less.
Open air intake sucks air mostly from engine compartment, in N55 case, the upper and hot half of it. Which is why IAT climbs quick at low speed when not enough air flow to dissipate heat from compartment.
Closed box takes air from outside thru scoop or duct. That's what "heat isolation" is all about.
Additionally N55s' MPPK and M2 boxes are half open at lower part, which flows cooler air by nature.
We can't just come to conclusion factory is best. Power/Flow can go up to the point where factory intake plumbing become a restriction. But I'm sure it's somewhere beyond most of builds out there.
__________________
Lemania 2320
|