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Old 01-13-2007, 07:32 PM   #1
subydude22
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Member#: 108043
Join Date: Feb 2006
Location: Waitsfield, Vermont
Vehicle:
97 legacy outback
navy

Default intercooler question for my legacy

im building a 2.2turbo for my obw. I am definately going to add an intercooler but I dont know whether or not to get a tmic or an fmic if they make one for the legacy. what do you all think.

trevor~
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Old 01-13-2007, 07:50 PM   #2
morrocco88
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Join Date: Jan 2006
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97' LGT 2.3 Dstroke
Rotated BW S256 6speed

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What year OBW? If you are looking for cheap, you could always use a stock wrx IC, but how much power are you shooting for, as this could hold you back. I have an 03 wrx cooler on my 97 legacy, but I'm in the stock wrx power range. I had to do some trimming to get it to fit, but it can work and the price was $75 used compared to hundreds of dollars for a new aftermarket unit from a variety of companies.
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Old 01-13-2007, 08:13 PM   #3
subydude22
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thats the same thing I was thinking. I was gonna try to find a stock wrx ic but I didnt know if some company made fmic for them. my car is '97. im not shooting for high power. something similar to a stock wrx, maybe a little bit more.
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Old 01-13-2007, 08:29 PM   #4
ten80
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00 EJ205 LGT LTD

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I have a forester intercooler + bov + hoses I'd part with for cheap!

PS. there are lots of factors that come into play for optimum power. A properly tuned engine can make good power on even a small intercooler. My friend's V2 EJ20G swap made 249whp (~5000ft elevation) on the stock, tiny, JDM intercooler. We were in the process of installing a FMIC, however, it was too much of a pain in the rear and we went back to stock . I'd guess that a forester/wrx oem intercooler is good for up to somewhere near that power range, which is nearly impossible to attain with a TD04 or VF8 turbo.
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Old 01-13-2007, 08:53 PM   #5
morrocco88
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I'm running the stock EJ20G from an auto tranny JDM legacy, and it has the VF10 turbo. I couldn't get past 13 psi before it was making more heat than power. Is the TD04 larger than the VF10?

I would go for the top mount since it is easier, and think that you would have less lag for a street car, but maybe I'm wrong. Maybe someone who has had both can chime in on this?
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Old 01-13-2007, 09:44 PM   #6
jey
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Go for the TMIC. It's simpler and you can use a bunch of different OEM setups. I've got a WRX IC on my 98 Legacy - hard to beat OEM reliability too.
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Old 01-13-2007, 11:53 PM   #7
rougeben83
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How much boost are you planning to run? For a low boost application (like less than 1 bar), the WRX intercooler is plenty fine; it also reduces pressure loss since the IC is right at the TB, and helps the pressurized air get into the engine quicker (less tubing it has to travel).

A FMIC would only be worth it if you're going to be boosting that engine above what a WRX engine does (14psi), or you're in a lot of stop and go traffic in hot,hot weather and worry about heatsoak.
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Old 01-14-2007, 09:20 AM   #8
xcntrk75
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Obviously your OBW has a hood scoop already which you can open up?

FWIW I have both a WRX and STi top-mount IC’s FS including all hoses & lines…
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Old 01-14-2007, 09:59 AM   #9
ten80
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Quote:
Originally Posted by morrocco88 View Post
I'm running the stock EJ20G from an auto tranny JDM legacy, and it has the VF10 turbo. I couldn't get past 13 psi before it was making more heat than power. Is the TD04 larger than the VF10?

I would go for the top mount since it is easier, and think that you would have less lag for a street car, but maybe I'm wrong. Maybe someone who has had both can chime in on this?
Sorry, I should have elaborated. TD04's are the stock turbos on WRX's and are really very small. I beleive that kbahus, my friend, is running VF10 and he made maximum power somewhere near 18psi. IMHO, FMIC, unless done right, results in lag, heat soak through long pipes, poor air flow, a PITA installation, weakened bumper beams, and the potential for excessive front-end accident damage. I'm all for TMICS, using hood scoops and the apropriate splitters.

xcntrk75, we'll have to thumb-wrestle or something for the sale
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Old 01-14-2007, 02:28 PM   #10
rougeben83
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IIRC TD04 is good up to around 16-18psi before it starts choking on itself.

Also, it's better to match your turbo to the displacement of your engine; that is, if you actually want a driveable, fast car, rather than a dyno-queen that you can brag top end HP numbers with.

A TD04 is a pretty good match for the 2.2l, should give you a nice torque curve and little lag.
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Old 01-14-2007, 07:13 PM   #11
xcntrk75
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Quote:
Originally Posted by ten80 View Post
IMHO, FMIC, unless done right, results in lag, heat soak through long pipes, poor air flow, a PITA installation, weakened bumper beams, and the potential for excessive front-end accident damage. I'm all for TMICS, using hood scoops and the apropriate splitters.
Might want to note that on the BD/BG model, the STi top-mount is really the largest IC that will fit under our low hoods. I ran a sti tmic on mine and it still rubbed all over the place. Sometimes front-mounts are unavoidable especially when considering turbo cfm.

But I agree, a 2.2l with a sub 500cfm turbo, TMIC FTW!
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