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Old 09-10-2005, 03:28 PM   #1
cornerbuddy28
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Default AWIC system

Ok so I'm working on a plan to build an air to water intercooler for my 95 impreza (soon to be ej20 swap) and I have a few questions/concerns. My idea so far is to close up a stock 02 wrx tmic for the intercooler and run lines and a pump to a heat exchanger up front. My concern however is the effectiveness of the intercooler if I run a larger turbo eventually (18g? vf22 maybe?) in which case I might think about getting something larger, maybe an sti top mount for the awic. Then I wonder if there would be room to build a water end tank on top of the IC with the hood coming down right on top.

The other thing is the heat exchanger. I don't know how many answers I can get about finding the "ideal" exchanger/radiator but since you're already reading this I'll ask, haha. I need to find something that will flow very freely, and obviously be able to cool the water as much as possible. Does anybody with an awic set up have any suggestions?

thanks - Colin
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Old 09-10-2005, 08:32 PM   #2
Tats
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Ummm.......how do you plan to "close up a stock 02 wrx tmic" skippy?

Tell me you don't think it's that easy. Unlees of course your gonna kust incase it in anoter box and run collant through that. But then the bypass valve screws that.
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Old 09-11-2005, 12:35 AM   #3
cornerbuddy28
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well I was thinking I could weld a plate onto the top so that there's a space where the coolant (water) can flow from a hose through the intercooler and then fabricate another end tank on the other side with a fixture for the water to flow out through a hose to the heat exchanger. The bov is on the front endtank so its not in the way.

I mean am I just full of hot air or does this sound feasable?
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Old 09-11-2005, 02:26 AM   #4
Master2192
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I think it would work better to run the water through the inside of the intercooler, and run air through the fins. Course thats one hell of a modification to the intercooler. But that would run it more like a radiator and would help pull more heat out.
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Old 09-11-2005, 02:41 AM   #5
cornerbuddy28
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hmmm. I hadn't thought of it that way. Yeah that would be a hell of a modification but I'm not sure I see why running it the opposite way would make it dissapate heat more efficiently.
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Old 09-11-2005, 03:55 AM   #6
no-coast-punk
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I've written a bit how my AWIC is set up. Do a search. Any Air/air core will make a pretty crappy air/water core. As for a heat exchanger... trans. coolers out of old GM commercial sized trucks work awesome.
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Old 09-11-2005, 10:45 AM   #7
cornerbuddy28
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Oh ok. I'd like to find out what the differences are between an air/water core and an air/air core. I was just throwing the idea of modifying the stock ic out there cause I love building my own crap but maybe this is just one of those things I really can't do myself and do it well.
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Old 09-11-2005, 11:12 AM   #8
dwx
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If you are getting an air/water IC from say Spearco, Bell, PWR, they are generally jacketed air/air cores with slight differences. The point is you want water next to wherever air is flowing. I'm using a Bell air/water setup right now with a front mounted radiator. A good air/water radiator for cheap is one off a used Ford Lightning/Mustang, they will cool more effectively than an oil cooler. I had originally wanted to use a Laminova-cored system but this came along at a much cheaper price.

Lots of guys have jacketed standard air/air cores and saw the benefits of using an air/water system.
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Old 09-11-2005, 11:17 AM   #9
no-coast-punk
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Air/water cores typically have much closer/smaller fins on the "exterior" for the water to flow through. Since your flow rates aren't nearly as high as air blowing across the unit, you can run more/closer fins that would normally block airflow. This increases the surface area greatly and makes sure the water does all the cooling it can.

You can use an air/air core to do this... it just won't be very efficient. Pro-ecm makes great air/water cores, so does spearco. Mine is a spearco core. Had pro-ecm cores been around earlier I would have used one of theirs.
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