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Old 10-18-2008, 02:15 PM   #1
neko
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Default STi TMIC size/specs comparo. (I.E. is the 08 an upgrade?)

So i'm a big fan of keeping my car tmic. I'm also a big fan of the oem style tmics, i think they're better than the ginormous, and hard to fit in your car, aftmerket ebay TMICs.

So, now out comes the 08 STi tmic, and i look at it and go "wow, that looks wider than mine..."
For reference, i run a v7 STi TMIC currently.

What i need is some hard facts, some core measurements at least to compare to to other STi models. Also, when it comes to width, it seems the vertical rows are evenly spaced on all factory tmic's, wrx or sti. So counting them helps. I know those already. Also, seem to be almost identical in interior construction, so for now we'll assume they have about the same flow restrictions.

For comparison, the WRX TMIC data:
Rows: 30
Core dimensions: 16.5 x 6 x 3
Total cubic core space: 297ci

Option #1: USDM STi TMIC.
Rows: 34
core diemnsions: 18.5 x 6.625 x 3 (confirmed)
Total cubic core space: 368ci

Option #2: JDM V7 TMIC
Rows: 34
core dimensions: 18.5 x 7.25 x 3 (confirmed)
Total cubic core space: 402ci (9.2% increase over USDM 04-07 STi core)

Option #3: USDM 08 STI TMIC
Rows: 38
core dimensions: 20.75 x 6.85 x 3 (confirmed)
Total cubic core space: 426ci (for a 15.7% increase over USDM 04-07 STi core)

Of course, to take full advantage of the certain larger ic's, you must have a splitter that fits them fully, but thats another issue, and easily taken care of.

Ok, ladies and gents. we now have all our answers. The math is above. The numbers don't lie (as long as i was well informed. feel free to check n prove me wrong). Turns out the new 08 core is the biggest when it comes to overall core dimensions. Which is really the best performer? no clue. I don't exactly have the means to test that. But i can compare sizes and go off that. Of course, i'm also still assuming subaru continued to use the same 3" thick core for all its IC's. Never seen any evidence to the contrary of that.

Will i upgrade to the 08 core? maybe. it does offer more core space, but does sit further over the turbo. My IC already gets warm on the pass side quick when sitting.
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Old 10-18-2008, 03:55 PM   #2
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I just installed a Perrin FMIC Kit, I can tell you it hauls azz to redline! The temperature difference is just too great for me to go back to OEM.

The 08-09WRX's doesn't have the same setup as the old WRX's or the new STi's. The bypass valve is plastic and isn't directly bolted onto the intercooler correct?
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Old 10-18-2008, 04:58 PM   #3
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correct, the new "wrx" setup is different. i think the STi tmic's can be made to work, but its not as nearly bolt-on as the older ones. So i'll ignore those for simplicity.

However, the New STi's use the same layout as the previous GC/GD setups.
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Old 10-18-2008, 05:05 PM   #4
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No, it absolutely cannot be made to work without swapping the sti intake manifold.

I also read 08 sti tmic is only 3.6% larger than previous ones.
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Old 10-19-2008, 10:13 AM   #5
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oh, ok, so STi only usage. works for me either way, its not like i have an 08 car or anything
<---

Also, randomly stated facts (3.6%) floating around the board don't count in my post, i gotta see numbers. Unabombers post for instance has measurements, but there's some errors. (like the v7 is not 4" thick, and the width on most of them are off. they measured more than the core)

Basically, i'm thinking either the new 08 STi core is the same height as the older usdm one, just wider, or else its wider and longer in height as well. Depending on which one, it could be bigger than the v7 internally, or about the same. It's already an upgrade over the 04-07 USDM's, thats pretty much determined.

However, i did measure my v7 core last night. 18.5 x 7.25 x 3. Its tough to get a thickness measurement, but AFAIK, all the cores are the same thickness, so we're really only concerned with two dimensions. However, i'll try to confirm that hypothesis as well.

Here's proof on the height. (the only dimension that varies between usdm and V7)
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Old 10-19-2008, 10:19 AM   #6
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also, my new math effort is that 18.5" includes 34 vertical rows on the V7 core. If i break that down its approx .544" per row. That makes the WRX core 16.3" wide(which agrees with unabombers figures), and the new 08 about 20.6" wide. We'll list those for now, pending visual confirmation.
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Old 10-19-2008, 06:12 PM   #7
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The new WRX intake manifolds are plastic? Aren't those things under pressure? Alot of boost pressure?
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Old 10-19-2008, 06:27 PM   #8
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They are. LGT has had the plastic manifold since the begining. It's actually better design than STI and withstands high boost without problem. People run big turbos with it and it's actually popular mod for rotated setup as it places the throttle body in better spot for fmic piping.
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Old 10-19-2008, 10:17 PM   #9
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Quote:
Originally Posted by unclemat View Post
No, it absolutely cannot be made to work without swapping the sti intake manifold.

I also read 08 sti tmic is only 3.6% larger than previous ones.
This is false. Nasioc member "Its_just_yukio" ran an 08 STi TMIC on his 03 wagon at Subiefest3. He has a stock intake manifold and cable driven throttle body.
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Old 10-19-2008, 10:27 PM   #10
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Quote:
Originally Posted by TRooper View Post
This is false. Nasioc member "Its_just_yukio" ran an 08 STi TMIC on his 03 wagon at Subiefest3. He has a stock intake manifold and cable driven throttle body.
Read above again. This was about 08+ WRX/05+ LGT plastic intake manifold that cannot work with STI/pre-08 WRX style manifold.
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Old 10-19-2008, 10:39 PM   #11
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Quote:
Originally Posted by unclemat View Post
Read above again. This was about 08+ WRX/05+ LGT plastic intake manifold that cannot work with STI/pre-08 WRX style manifold.
Read above what your asking me to read above. The OP has an 04STi. If you were replying to a post that was a bit off topic, you should of quoted it. Otherwise, we are to assume you were referring to the OP.
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Old 10-19-2008, 11:48 PM   #12
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Quote:
Originally Posted by unclemat View Post
No, it absolutely cannot be made to work without swapping the sti intake manifold.

I also read 08 sti tmic is only 3.6% larger than previous ones.
Where did you "read' this?
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Old 10-19-2008, 11:56 PM   #13
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Quote:
Originally Posted by Clark_Kent View Post
Where did you "read' this?
I "read" this here:

http://forums.nasioc.com/forums/show...9&postcount=38

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Old 10-19-2008, 11:57 PM   #14
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It's possible that the comparision above is to jdm tmic, so the difference wrt USDM 04-07 sti tmic might be larger like the OP stated.

Even if it's 10% larger, tools pay 50% more for it...

Last edited by unclemat; 10-20-2008 at 12:03 AM.
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Old 10-20-2008, 11:27 AM   #15
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however, the "outgoing" model in japan is the same size core as our usdm IC's. The V7 is still bigger than that. So this kinda makes me think it sits in between. Slightly larger than the USDM, shorter n wider overall. Still smaller than the V7 internally, tho not by a lot either. The other advantage is that the previous models don't hang over the turbo as much as the new one does. interesting for sure either way. I'll be measuring a stock usdm if i can get a chance today perhaps, with pics. Then i just need to find an 08...

And yes, even tho fitment in various models was not on my list of things to determine in this thread, i think we've straightened it out. All these discussed IC's can be used very easily on 04+ STi's, and 02-07 WRX's. (also probably most GC-chassis turbo drivelines). Sorry you 08+WRX owners. out of luck...
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Old 11-03-2008, 06:13 PM   #16
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confirmation on USDM core dimensions. 18.5 x 6.625 x 3.
368ci core.

new math listed in entries on 1st post.

Now i just need 08+ core dimensions.
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Old 11-05-2008, 12:55 PM   #17
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bump, any one with 08 sti core dimensions?
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Old 11-05-2008, 01:21 PM   #18
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Quote:
Originally Posted by neko View Post
bump, any one with 08 sti core dimensions?
My 08 STI TMIC is 20.75" x 6.85"



Jeff Sponaugle
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Old 11-05-2008, 01:56 PM   #19
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Also, here are some part numbers to add to your list:



Code:
TMIC Part Number      Model
21820AA252            US STI 04-07 
21820AA380            US STI 08 

21820AA175            JDM Version 7 
21820AA270            JDM Version 8/9 
21820AA260            JDM Version 10

21820AA175            EU 2002 EJ207 
21820AA270            EU 2003-2005 EJ207
21820AA252            EU 2006-2007 EJ207


Jeff Sponaugle

Last edited by sponaugle; 11-05-2008 at 02:11 PM.
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Old 11-05-2008, 11:31 PM   #20
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oh good. thanks for the numbers Jeff. That should finally round out the questions here... fixed the info up top.
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Old 11-11-2008, 10:50 AM   #21
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Stock TMIC dimensions are correct in post #1
I just picked up an APS TMIC and the dimensions are as follows;
7.5 x 20.125 x 4.375
yielding 660 cid (56% more volume than the STi TMIC)
29 rows not counting the two outer-most as i cannot verify if they're functional or not (assuming not)

this may seem a little OT for the OP but might be useful for others considering a change
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Old 11-11-2008, 06:03 PM   #22
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TMIC's suck.
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Old 11-12-2008, 01:51 PM   #23
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Quote:
Originally Posted by cpunlamd View Post
TMIC's suck.
Only if you're a lag-lover
By shear physics, TMIC's have less lag than FMIC's. Some of us don't like big laggy turbo setups. But hey, you just do whatever you want. We'll keep comparing facts on proven performance solutions.
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Old 08-04-2009, 09:12 PM   #24
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Do you have an update on this?
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Old 08-05-2009, 08:04 PM   #25
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on? what exactly? is there a question we didn't answer?
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