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Old 01-09-2006, 12:43 AM   #1
crystalhelix
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Default JDM V7 STi TMIC vs USDM STi TMIC

So the reported difference is 15% larger for the JDM V7 over the USDM STi intercooler. Where is this difference accounted from? I have counted the finds and both intercoolers have 34 external rows of fins and 32 internal. So I am assuming the width is the same. I am just wondering if it's thicker or taller from front to back. Does anyone have any measurements?

Thanks,
Justin

I did a search (multiple ways) but keywords like "JDM" and "V7" always get washed out. Maybe I just don't know how to search better, lol.
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Old 01-09-2006, 12:48 AM   #2
Soon2Bgreat
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It's taller by a visually noticeable difference.

Louis
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Old 01-09-2006, 12:49 AM   #3
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It is taller front to back by about 0.625(15mm?), I believe because the JDM's aren't DBW.

I would like to know what kind of pressure drops these TMIC's have? Anyone? Sorry about the thread highjack....
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Old 01-09-2006, 08:26 AM   #4
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Ok, so JDM's aren't DBW, but they will fit a USDM STi right? I am thinking of putting one on my 2004 STi (US)
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Old 01-09-2006, 08:48 AM   #5
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I believe you would need to modify the brackets. When they lengthened the IC, they also changed the position of the mounting tabs on the sides, rather than changing the brackets.
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Old 01-09-2006, 10:10 AM   #6
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Just out of curiosity, why are you swapping to a *slightly larger* TMIC? Any particular reason? Are you just looking for some slightly increased cooling headroom? What are your power goals? Will the car be tracked at all? For example, I try to track my car as often as possible, so ANY TMIC wasn't enough for me, I ran into constant heat-soak problems after just a few laps. Moving the IC out of the hot engine bay really seemed to help keep intake temps cooler, longer.

Now if you don't track the car, but plan to upgrade teh powAr, I might look into something larger than any of the OEM TMIC's.

But if you're just going to keep things pretty close to what they are now, you should be fine for daily driving and autocrossing.

Just my .02USD, ymmv, restrictions apply.
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Old 01-09-2006, 12:56 PM   #7
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Quote:
Originally Posted by bluscooby23
Just out of curiosity, why are you swapping to a *slightly larger* TMIC?
I want to use it because fitment would be the best, I have seen other TMIC's that are a PITA to install.
Any particular reason?
I race in the SCCA SP class and I can't run a FMIC but I can run a larger TMIC.
Are you just looking for some slightly increased cooling headroom?
I plan on snaggin a JDM for the slight volume increase and have it coated with thermal dispersant w/claims of increased efficiency.
What are your power goals?
350whp (stock turbo STi, no turbo mods at all on C16)
Will the car be tracked at all?
Autocross only, (45 seconds - balls to the walls)
For example, I try to track my car as often as possible, so ANY TMIC wasn't enough for me, I ran into constant heat-soak problems after just a few laps. Moving the IC out of the hot engine bay really seemed to help keep intake temps cooler, longer.

Now if you don't track the car, but plan to upgrade teh powAr, I might look into something larger than any of the OEM TMIC's.

But if you're just going to keep things pretty close to what they are now, you should be fine for daily driving and autocrossing.

Just my .02USD, ymmv, restrictions apply.
Responses in red, feedback appreciated.

Justin
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Old 01-09-2006, 01:16 PM   #8
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Thermal dispersant? Ya know bare aluminum is actually a very effective material for air heatsinks... I'd have to see some pretty convincing evidence to coat an already highly effective surface with another in hopes of an efficiency improvement.
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Old 01-09-2006, 01:43 PM   #9
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Quote:
Originally Posted by Freon
Thermal dispersant? Ya know bare aluminum is actually a very effective material for air heatsinks... I'd have to see some pretty convincing evidence to coat an already highly effective surface with another in hopes of an efficiency improvement.
I hear you, hence why I say "claims" lol.
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Old 01-09-2006, 02:31 PM   #10
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Can you run an auto IC sprayer?
I assume that heat wrap / shields are open in SP?

I would wrap and spray rather than buy a 15% bigger core.
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Old 01-09-2006, 02:35 PM   #11
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Quote:
Originally Posted by javid
Can you run an auto IC sprayer?
I assume that heat wrap / shields are open in SP?

I would wrap and spray rather than buy a 15% bigger core.
Well, I could sell my USDM for some/most of the cost of the JDM and then the dispersant is $125 and it involves a complete cleaning of the IC so it would probably work better just from being cleaned, LOL. I am not sure about wrapping, so that means no, but it does mention heat shields can be added or removed.
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Old 01-09-2006, 02:51 PM   #12
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Quote:
Originally Posted by crystalhelix
Responses in red, feedback appreciated.

Justin

J,

I'm not too familiar about the thermal dispersant you speak of, so I wouldn't be able to offer an opinion.

As far as JDM TMIC vs. Perrin or TXS or APC or whatever brand TMIC, In that location, on an STi, they're ALL a PITA to get in and out. My next question would be a cost/benefit analysis of JDM TMIC vs. brand X TMIC. Which one flows the best, has the greatest cooling efficiency, the lowest pressure drop, etc for your money. Of which I'm sure there are plenty of opinions here on Nabisco.

If you're shooting for 350awhp on C16, I'm assuming your class allows boost modification and engine management. That being said you should be able to get close to those numbers, but the VF39 really starts to run out of breath at those levels. If you are allowed I would probably recommend an upgrade like the 20g. Same boost response as stock, MUCH better top end. Also you wouldn't lose anything on the bottom end either. (Slightly unrelated to your question, but worth considering)

Also, are you allowed to run an IC sprayer? I would think that can become a significant helper as well. Water reeeeely helps fight heat soak and would extend the cool periods for your runs. You might even consider the 12L JDM bottle (mounts across the back seats).

But I agree with javid, et all. I probably would not spend my money on a 15% bigger core. For a little more (or less if you can find one used) you can get a lot more internal volume. From what I've read even the eBay TMIC cools pretty darn well.

Hope I gave you a few things to think about, or even pointed you in new directions.

Colin
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Old 01-09-2006, 05:32 PM   #13
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a 20g will have the same repsonse and boost characteristics as a stock STI....that means stock eninge and ECU....not sure if thats what u meant colin. A stg2 STI tuned with its vf39 will spool a good 500-600rpm before the 20g....maybe even more. I think the vf39 would be better for autox.
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Old 01-09-2006, 05:58 PM   #14
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My concern was his 350awhp requirement, that's why I suggested the 20G. And properly tuned it's pretty darn close to the VF39. I think 600 rpm might be overstating it a bit, but I guess that's also dependent upon the tuner as well.

Don't get me wrong, for autox the 39 is a great turbo, with fantastic response.
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Old 01-09-2006, 06:06 PM   #15
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350awhp is a goal, and I am being optimistic with the C16, on pump and the drive around tune it will not be a reqiuirement, maybe somewhere around 300-310whp for daily driving on pump gas. Basically I plan on using C16 for 15 minutes every weekend, lol, for autocross. I cannot change turbos in StreetPrepared. I was just thinking the JDM would fit the best, be a little bigger and may work better with the dispersant than my stocker STi for ~200$ difference.
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Old 01-10-2006, 09:06 AM   #16
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For $300 buy an ssautochrome TMIC core (over 700 c.u.) or get the core, bov and piping for $400. (ssautochrome.com)
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Old 01-10-2006, 10:47 AM   #17
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I already have one. I plan on testing it vs. my stocker in the near future with true bench testing.

J
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Old 01-10-2006, 08:51 PM   #18
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Quote:
Originally Posted by javid
Can you run an auto IC sprayer?
I assume that heat wrap / shields are open in SP?

I would wrap and spray rather than buy a 15% bigger core.
in SP classes you can only use the ambient air to cool an intercooler....i.e. no water spray while on course.
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Old 01-13-2006, 03:16 PM   #19
crystalhelix
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Does anyone have the Subaru Part number for the V7 JDM TMIC? Or ways to identify via pictures it's the real deal?

thanks,
Justin


I also notices the V8 is missing some of the top section, it looks like that might help distribute air through the IC better.

J

Last edited by crystalhelix; 01-13-2006 at 03:40 PM.
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