Originally Posted by
Evo Racewerks
I chose not to go with a thin core. Having a thin core would require the need for the core to go tall, like the AWE FMIC to get the core size require to even make a difference in intake air temperatures. I'm sure many of you guys know that the B7 A4 has 2 OEM SMIC's which is a big improvement over the B5/B6 single SMIC. Air wants to travel through the least resistance. Therefore, unless you actually have a massive build up of pressure in the FMIC (which causes pressure drop), the air will want to travel straight from inlet to outlet. Since the inlet/outlet of the FMIC almost always sits at the bottom of the core, air will want to travel through the bottom and will not want to travel on the top of the FMIC, thereby loosing potential efficiency of the FMIC. Also, I did not want to block the whole face of the radiator with the FMIC. We live in SoCal and in the summers, heat is an issue. We wanted to keep the top face of the radiator open and not reduce coolant cooling efficiency.
Hi Fred,
Nice product. Clean fabrication work as always from you guys.
However, just a couple comments regarding intercooler theory:
Increased exposed surface area is always superior to increased thickness. Increased thickness is better than nothing, but because of the heat from exchange that is carried through the thickness of the core as the outside air travels through it, cooling becomes less efficient as you approach the back of the core. In other words, the outside air towards the back of the core is much hotter than when it enters the front, which reduces its ability to wick away heat.
Of course internal air management is critical for proper dispersion through the core, and what you say is correct regarding a tall core with inlet at the bottom. That is why we spent considerable time computer modeling air flow with our tall core, and designed an inlet tank that has a diverter vane in it. CFD modeling can reveal turbulent areas in the tank that can be improved with reconfigured geometry.
We were concerned with cooling system heat, too, as we saw unacceptable coolant spikes when using a FMIC on the B5 S4. However, we have done extensive data logging on the street and track in extreme heat and there are no issues with our design.
Lastly, the pressure drop from the two side cores is pretty bad with the stock design once you increase flow even with a chip.
Anyway, just wanted to set the record straight. Good luck with your product!
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