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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,721
I went more than the 749 cfm I calculated for my engine due to the rear placement of the intercooler. Sure an intercooler that's twice as big as it needs to be won't be twice as efficient and may only be a percent or two more efficient, it does give some margin for hot track days.

You'll also hear there's more lag with a larger intercooler, but one expert I talked to said if you go few days between a small and large intercooler you won't even notice any difference.

The big disadvantage to a large intercooler is weight. My intercooler weighs 30 lbs

If you're going to build your own, pay particular attention to the end tanks. I tapered mine across the inlet and exit to help keep the flow even.

As for front to back vs side by side, who knows? On front to back the air moves slower so it has more time to cool while a side to side has more velocity but each passage is longer so it has more surface area to exchange heat. ?!?!?!
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 06-16-2008, 04:59 PM
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