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Old 10-12-2010, 08:51 PM   #26
paintbing
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Sorry I didn't respond earlier. The point of modding the stocker was two-fold:

1) To get more efficiency from the bigger scoop, you'll need to raise the splitter to seal against the top (underside) of the scoop. If you install a taller scoop you'll have a good 1 inch gap between the splitter and scoop - effectively rendering the larger scoop useless.

2) I enlarged the splitter to direct (and contain) all airflow to the larger footprint of the new TMIC. This should be done with all aftermarket TMIC's (regardless of the scoop used).


Quote:
Originally Posted by quazimoto View Post
Most aftermarket splitters direct and distribute air equally over the TMIC. The one the OP made will just cool the top part of the TMIC.
Not 100% true...I do agree that by having the added diffuser the STI splitter has, will help assist/direct airflow to the front of the TMIC. BUT, I think it's hard to prove that I'm only cooling the top(rear) part of the TMIC without it. I am still getting the same amount of air passing through the intercooler... right? If anything by having the extra diffuser, you're actually creating an obstuction which will slow the incoming airflow, but you'll have the benefit of knowing the airflow is distributed between the top and bottom.
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Old 10-13-2010, 12:36 PM   #27
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Quote:
Originally Posted by paintbing View Post
Not 100% true...I do agree that by having the added diffuser the STI splitter has, will help assist/direct airflow to the front of the TMIC. BUT, I think it's hard to prove that I'm only cooling the top(rear) part of the TMIC without it. I am still getting the same amount of air passing through the intercooler... right? If anything by having the extra diffuser, you're actually creating an obstuction which will slow the incoming airflow, but you'll have the benefit of knowing the airflow is distributed between the top and bottom.
Even though it's the same amount of air going through, that air will be moving more quickly if it's concentrated on a small part of the IC. Because of the faster moving air, the heat will have less time to transfer to the air as it passes through. Also, the IC surface area being exposed to incoming air will be less without a diffuser. If less surface area is exposed, less heat can be transfered.

In a perfect world, air would flow evenly over the entire IC.
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Old 10-14-2010, 02:28 PM   #28
paintbing
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Quote:
Originally Posted by 573 View Post
Even though it's the same amount of air going through, that air will be moving more quickly if it's concentrated on a small part of the IC. Because of the faster moving air, the heat will have less time to transfer to the air as it passes through. Also, the IC surface area being exposed to incoming air will be less without a diffuser. If less surface area is exposed, less heat can be transfered.

In a perfect world, air would flow evenly over the entire IC.
Kind of....
We need to take into account the theory behind the wind-chill factor. The faster the air moves across a surface, the quicker the said surface will transfer heat... to a degree.

Once the air speed reaches a certain point (not sure what it is) the amount of heat transfer is flattened. Whether that speed is 10 mph or 100 mph I am not sure.

Either way, their will still be air moving through the entire TMIC. The top may be faster while the bottom might be slower, but air is still moving across all points.
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Old 10-14-2010, 05:17 PM   #29
EvileyeZ88
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has anyone done this with a stock wrx splitter to fit an sti top mount? also what else could serve as a good material to use for the seal?
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Old 10-14-2010, 06:28 PM   #30
paintbing
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Many people have used garage door seals - it's a foam/rubber compound that will help seal the TMIC to the scoop/splitter.
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Old 10-14-2010, 06:36 PM   #31
EvileyeZ88
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perfect thanks
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Old 10-14-2010, 08:50 PM   #32
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Quote:
Originally Posted by paintbing View Post
Kind of....
We need to take into account the theory behind the wind-chill factor. The faster the air moves across a surface, the quicker the said surface will transfer heat... to a degree.

Once the air speed reaches a certain point (not sure what it is) the amount of heat transfer is flattened. Whether that speed is 10 mph or 100 mph I am not sure.

Either way, their will still be air moving through the entire TMIC. The top may be faster while the bottom might be slower, but air is still moving across all points.
Part of the whole wind chill thing is more air is hitting you. in this instance, there's a fixed amount of air coming in through the scoop. you're better off distributing that air evenly over the ic so it can pick up as much heat as possible as it passes through. if you want to take advantage of the whole wind chill thing, drive faster.
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Old 10-14-2010, 09:14 PM   #33
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Quote:
Originally Posted by 573 View Post
Part of the whole wind chill thing is more air is hitting you. in this instance, there's a fixed amount of air coming in through the scoop. you're better off distributing that air evenly over the ic so it can pick up as much heat as possible as it passes through. if you want to take advantage of the whole wind chill thing, drive faster.
+1, I did a bit of a test when I made my air splitter/divider for my '02 WRX and there was a difference of about 2*C colder IC core on average, but the main effect was faster cool-down, noticeably faster cooling down of the IC...
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Old 03-11-2011, 03:54 AM   #34
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i think i'm going to bust out the cardboard tomorrow and see how much of the zerosports wrx splitter i can replicate and measure out, just got an aps tmic and sti scoop. looking at an aps splitter but that's still 70$ at least used and i'm not sure how well it will even fit or how well their intercooler spray nozzles work. now, considering i'll probably buy the aps one anyway, and they don't sell in the US anymore, how cosher would it be to reverse engineer i?

Last edited by wrxkyle; 03-11-2011 at 04:06 AM.
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Old 07-23-2012, 01:04 AM   #35
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Oh, It's a JDM STI?
Pretty close.

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Bump from the dead, good 'ol search led me here and I completed this project this weekend.
I don't have a bunch of good pics but there was quite a bit needed to fit the version 9 intercooler. There is still a few minor tweaks I need to do but overall it should work better than the wrx splitter with no seal.




Still need to fill a few gaps.



Last edited by ImNOrobo; 07-23-2012 at 01:22 AM. Reason: photos
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Old 08-13-2012, 12:25 AM   #36
EvileyeZ88
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I started to mod my stock splitter, but the 06/07 wrx gets a postage stamp for a tmic, so that turned into a mess.

I just decided to make one completely from scratch.
All parts bought from home depot for under $30
Piece of 3'x3' aluminum $21.98
1/4" weather stripping $3.50
42" of 1 3/4 foam $2.55
42" of 2 3/4 foam. $3.55

Traced my zerosports splitter to get the general shape.


Then drilled the mounting holes and added weather stripping.


Then measured the opening for the tmic


Drilled the holes for the Turbo to vent, and mounted the thicker foam with silicone.


It's still a little bit rough, but it works great and keeps the tmic nice and cold.


Top mount will go from 140* to 90* in under 3 minutes

Next up will be to add the diverter fins, and some form of seal for my SRI

~Evil

Last edited by EvileyeZ88; 08-13-2012 at 01:24 AM.
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Old 08-13-2012, 01:08 AM   #37
N8F
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Quote:
Originally Posted by EvileyeZ88
I started to mod my stock splitter, but the 06/07 wrx gets a postage stamp for a tmic, so that turned into a mess.

I just decided to make one completely from scratch.

~Evil
Genius sir. Pm me if you're interested in making another one to sell
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Old 08-13-2012, 01:11 AM   #38
EvileyeZ88
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You sir have a pm
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Old 09-06-2012, 01:06 AM   #39
Trudd84
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I will also be attempting this in a week or so, my 04 STi scoop should be in this Saturday. I have a question. Seeing as how this is all under the hood and scoop, nobody really ever sees it. My question is why not use cardboard to get an exact shape, and fiberglass it? I mean, in the end it's light weight, heat resilient for what it will need to do and a few good coats of resin and 2 layers of cloth and it will be strong enough to withstand the little bit of force it will have on it... but my footprint isn't changing, just the scoop. so maybe it will be easier for me. Will report back.
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Old 09-06-2012, 01:26 AM   #40
luvless2620
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At EvileyeZ88: Wow that splitter looks nice. Any plans on making a bellow for it as well?
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Old 09-06-2012, 05:32 AM   #41
EvileyeZ88
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Its got 2" foam on the front and sides, and 1 1/2" foam at the rear which creates a nice seal, and keeps the tmic nice and cool


I may eventually add diverter fins if I feel it needs them.

~Evil
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Old 09-06-2012, 08:21 AM   #42
HinshawWRX
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I simply cut my splitter at the back seam, and formed it to the inner form of the hoodscoop. Added braces to keep it solid, then used "speed tape" to fill the voids, and added 4 layers of it. It's held up for 8 months no problem, and you can clearly see the entire TMIC now. I may add a fin or two at a later point. I might grab pictures later.
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