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Originally Posted by BAN SUVS
I'll go to the garage and see if I can find the issue to scan, but basically the problem was simple. 6 pounds of aluminum takes WAY longer to cool off than 2 pounds of aluminum. Also, the massively thick core actually reduced airflow. So once your IC got hot (like, say, sitting at a red light, or staging for autocross) it would take much much longer for the airflow to cool it off and get the benefit of an IC at all. I can't remember the hard data (they put a few thermocouples on the car with both ICs and dyno'd them and drove them around) and basically found that the larger IC would result in lots of timing being pulled for several minutes after getting moving again, while the stock WRX IC took like 15 seconds to return to within 10-15 degrees of ambient at 25mph+. The heat sink effect works both ways. Of course, if you managed to get your giant top mount cool before starting your runs or your hot laps, then you would benefit from the larger core.
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I would agree with this. I believe the proper intercooler [size] to get is the one you're making just enough power for. I have my huge greddy FMIC and I wish I'd had gone with something smaller. Too late now I guess...