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Old 10-24-2003, 04:17 AM   #1
Kostamojen
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Question Old school Subaru Water-intercoolers...

Just curious, what are the good and bad things about the old school subie water-intercoolers? Im thinking if I do a turbo kit ill go with one cause I wont need a hoodscoop or a front mount or anything complitcated... Unless of course a water-intercooler is complicated

I presume they are limited to only a certain PSI too, and after that point would loose effectiveness... But thats the sort of info im after.
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Old 10-24-2003, 09:19 AM   #2
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PM the user (-ImportInvasion-), he's using an A/W intercooler on his JDM GC8 engine.

Brent
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Old 10-25-2003, 01:35 AM   #3
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Is he the only one? lol
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Old 10-25-2003, 04:02 AM   #4
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Im really insterested to know what he says. I was not aware that Subaru made a Water-Intercooler. Please reply when you find out.

-Jake
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Old 10-25-2003, 10:10 AM   #5
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Well, I'll say what all I know about them, but I don't know if I know enough.

When you use the A/W intercooler, you need another radiator and an electric waterpump just for the intercooler. I was told a small motorcylce radiator would work. As far as tubing, I was told the Porsche or VW or someone like that had a hose that I could use from the turbo to the intercooler. I'm not sure about a BOV though, since there is no mounting spot.

I did have an idea though, that would eliminate the seperate waterpump and radiator. On my WRX waterpump, there were two extra holes that I had to plug that I didn't have on my first waterpump. My idea is to run the feed and return lines off of there to the intercooler. Maybe that'd work, I'm just theorizing though.

I hope this helped some.

Brent
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Old 10-25-2003, 11:13 AM   #6
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Brent

If I understand what you're proposing, you're suggesting running coolant from the engine through the intercooler. You don't want to cool an air/water intercooler with the same coolant that's running through your engine. It's far too hot - 200+ degrees (F) once the engine's warmed up. Unless you're running fairly high boost pressure, that would mean the water would be hotter then the air you're trying to "cool". Plus, when you're off boost, you'd always be heating the air up to near the temperature of the engine.

Perhaps I didn't follow you though. Please elaborate if I've misunderstood you.

_Jeff
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Old 10-25-2003, 11:25 AM   #7
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Yeah, you understood me correctly. I didn't even think about the coolant being too hot. Yeah, you're right.

Yeah, so you'll need an electric pump and a small radiator then.

Brent
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Old 10-25-2003, 12:47 PM   #8
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STEALTH-WRX is has one... but he made it himself.

I think the only problem with them is once the water gets hot you SOL...


Quote:
I'm not sure about a BOV though, since there is no mounting spot.
On the intake pipe... between the compresser and the TB

Last edited by totoherbs; 10-25-2003 at 01:02 PM.
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Old 10-25-2003, 04:19 PM   #9
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I dont think the water will get that hot, its rather insulated... And if its that complicated with radiators and such, which I dont think it is cause the Legacy doesnt have anything like that, then it would be an awefully big hassle...

Im only gunning for 5-6psi anyways, so I dont need much in the way of an intercooler...
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Old 10-25-2003, 04:46 PM   #10
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Old 10-25-2003, 09:44 PM   #11
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tons of info in the conversions forum. we have covered it and killed it.
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Old 10-26-2003, 05:42 AM   #12
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Just read through alot of posts about it... Seems like the best thing for me would just be the stock Legacy setup including the pump and radiator... However, thats quite a bit extra weight... But it will be far more cost effective for me as I wont have to buy/paint a new hood or get a FMIC.

Im wondering, does anyone just run the pump to a manual/auto switch? Like so you can turn it off sometimes, because I would think having the pump constantly flowing would actually heat up the water at times... I did read that the legacy pump had two speeds, which might address this.
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Old 10-26-2003, 06:03 AM   #13
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Quote:
Originally posted by Kostamojen

Im wondering, does anyone just run the pump to a manual/auto switch? Like so you can turn it off sometimes, because I would think having the pump constantly flowing would actually heat up the water at times... I did read that the legacy pump had two speeds, which might address this.
I dont think thats a good idea... then you would have heat soked the water which would lower its effectiveness. Old school trubo celicas had a set up like that... They change the pump to run all the time and not just underload.

Quote:
tons of info in the conversions forum. we have covered it and killed it.
Do you have a link?
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Old 10-27-2003, 12:09 AM   #14
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They really are not very effective. Front mounts are not that more expensive than top mounts, and way more effective.
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Old 10-27-2003, 12:12 AM   #15
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Quote:
Originally posted by FJP
They really are not very effective. Front mounts are not that more expensive than top mounts, and way more effective.

I think they are effective... but for a limited time. As the water heats up it becomes useless and theres no way to get cold water in there.
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Old 10-27-2003, 04:32 AM   #16
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Like I said though, im not looking for VERY effective... Heck, at the PSI I will probably run I could go without an intercooler, but seeing as I can get a air-water as easy as I can get a top mount (I cant afford a front mount) which would actually just end up being an old Saab top mount intercooler cause I dont need much or need to try and squeeze in a WRX intercooler. But I just dont have a hood scoop, and any hood + repaint job will equate to costing 75% of my total turbo kit budget which is not an option.
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Old 10-27-2003, 08:25 AM   #17
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I understand your problem, I am in the same boat. 2000 Legacy (no scoop) with Ludespeed kit. I have contacted an Austrailian wrecking yard (Shore City Engines) about the old style Air/Water and they replied that they can send one for about $300 plus $50 shipping. The only thing I am hesitant about is the pipe from the turbo to the IC, this would have to be customized.

David.
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Old 10-27-2003, 03:55 PM   #18
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Quote:
Originally posted by djplegacy
The only thing I am hesitant about is the pipe from the turbo to the IC, this would have to be customized.

David.
Thats why im thinking of using all the old Legacy turbo piping that I can get as well along with the intercooler, so that hopefully everything will bolt up relativly fine... I havent decided if a crossmember swap is a good idea though, as it might be just as easy to have a uppipe made.
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Old 10-27-2003, 06:19 PM   #19
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Quote:
Originally posted by Kostamojen
Thats why im thinking of using all the old Legacy turbo piping that I can get as well along with the intercooler, so that hopefully everything will bolt up relativly fine... I havent decided if a crossmember swap is a good idea though, as it might be just as easy to have a uppipe made.
Better get the intake manifold too!
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Old 10-27-2003, 07:14 PM   #20
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Quote:
Originally posted by totoherbs
I think they are effective... but for a limited time. As the water heats up it becomes useless and theres no way to get cold water in there.
That's the reason for the secondary heat exchanger. The water absorbs the heat from the compressed air, the pump circulates it to the secondary heat exchanger which then releases it to the atmosphere. Sizing is the key. Water has a much higher specific heat than ar so it can absorb much more energy. Pumping it through the secondary heat exchanger, in my case a 2.5 RS radiator core, is where it is cooled and circulated back to the system. I'm nowhere near implementing my system, but it can be done effectively.
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Old 10-27-2003, 09:00 PM   #21
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Quote:
Originally posted by wawazat
but it can be done effectively.
I agree... after seeing stealths in real life I was sold, I was just refering to the stock....




I see where you might want the old school subaru one... but it seems ify to me... good luck and keep us informed on how it works out.
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Old 10-28-2003, 12:38 PM   #22
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I am running this setup on my car right now, I have a Subaru Liberty air water intercooler, with a johnson pump, a litlle radiator from a motorcycle and a custom made reservoir for water so i can pour some ice in it whenever I want to. Ill try to post some pictures so you can have an idea of it. Im also using a switch to turn the pump on anf off.
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Old 10-28-2003, 07:37 PM   #23
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Santo, a diagram of your setup would be cool. Even better a DIY Howto would awsome........
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Old 10-29-2003, 04:19 AM   #24
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Post Air/Water Intercooler

Here is some information about air/water intercoolers.

Legacy BBS

I was/am interested in this as well.
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Old 10-29-2003, 05:02 AM   #25
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Default Re: Air/Water Intercooler

Quote:
Originally posted by Kevin Thomas
Here is some information about air/water intercoolers.

Legacy BBS

I was/am interested in this as well.
Ya, read that one, good info.
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