[05'WRB]

Well, recently I got an used CF hood. I noticed there seems to be alot more room in the scoop area than stock. I guess because the stock has all those deflectors etc...

I have thought of putting a fan on the tmic, it seems like a good idea but there just not enough room with the stock scoop, and I don't want to hacked it up for a fan.
While at it, I am going to raise the stock scoop a little - 3/4" to get a potentially better/more air flow and to have a little more clearance for my fan. My bro tested his air flow vs air temp. on his 04' WRX a few years back. He found that at over 100mph, his intake air temp would rises, and not untill he dropped below those speeds, than his AT would start to cool off ( temp probe was on his tmic ). Didn't get to do this with the STi scoop but I my guess that the larger STi scoop would performed better than the smaller WRX's. I may still be able to get my fan under the scoop even without the scoop raised, but it would be really tight.
On with the show. I used a smallest Spal fan I can find: 5.5" x 5.5" x 4.5" (tall). 2 aluminum angles, plastic spacers was used to raised the scoop. High density packing foam to close the spaces between the opening ( hood - scoop ). I used silicone on the outside of it. Thought it's not quite pleasing to the eye but it may be easier for me to put it back to stock if I choose to. Other options may included making a spacer of some sort ideally, but it may be expensive trying to get it machined? Or just fiber glass it the scoop but it would make life harder for me to convert it back to stock.
The fan flows 252 cfm. hooked up to a toggle switch inside the car. I tried a relays but couldn't get it to work, maybe a faulty one? But for now I am using just the swith and a inline fuse hook up to the battery so I can turn it on/off any time. Believe it or not it does create quite a flow even with this small fan. The good thing about his fan is that it's compact, and it doesn't get in the way of air flowing into the scoop/intercooler. The fan is directly over in front of the TB ( see pic ). The 2 sides of the scoop are still open to air flow to the cooler, and I believed it's important because that's where the turbo/inlet of flow from the turbo. The other one is located on the driver side. That "Y" tube that's under the cooler where air from the turbo.

[torquemada]

nice idea, for me not practicable (germany and high speeds ), but it would be better to put the fan to the right (drivers view) because there ist most of the heat soak created (turbo)

[05'WRB]

That would make alot of sense too but I want to have it in the center to cool the hot air in middle section just before it enters the TB. Most of the air deflected to the rear of the intercooler and nothing up front from the scoop.
As you can't really tell from the pics but the only part you see throught the scoop is just the top part of the fan motor ( round coil and connector part ) so their is still a good amount of air going throught to the back and into the cooler.
The scoop is bolted down well, you won't be able to ripped it off unless the whole hood is coming off with it.
For even better result, I could installed two mor fans on either side but up in the same front air of the scoop. If I can find some that event shorter than this one so nothing at all will be in the way of the air flow going throught the scoop. Heck that would be the best of both world. At speed you get steady air going throught to the back of the scoop/intercooler, or you can have the option of cooling the entire cooler with the added fans. It would be just like having a FMIC but even better, the intercooler will be cool at anytime you chooses.
I am not engineer or an expert in design or anything. But from my personal observation, this may potentially produced the same cooling capability as an FMIC (if both where the same sizes)? The advantage with a FMIC is the larger size, better and better cooling at speed but the draw back if any is the heatsoak from the inter cooler piping?
Please don't get me wrong, I am not saying everyone should get rid of their FM or a TM. But for us guys that doesn't have/want the FM, this may be the closes thing to a FMIC. 3 fans setup.

[halfelite]

Originally Posted by torquemada

nice idea, for me not practicable (germany and high speeds ), but it would be better to put the fan to the right (drivers view) because there ist most of the heat soak created (turbo)

This is actully not all that true. The drivers side of the car has more heat as its more compacted together were as "trubo" side gets a lot more air flow under track stress were the turbo is spooling a lot then yes but under normal conditions even spirited driving more heat is trapped on the driver side. If you see my post here NASIOC - View Single Post - Aquamist (Water injection) questions and answers here...

I took some thermal imaging and the corners of the tmic closest to the front of the car get the most heatsoak.

[snorky]

you would need a bigger fan with a higher flow rate than that or two of them.

you'd combat a lot of heat soak and hot spots with a diffuser (the factory one works very well) and a seal around your intercooler. as it stands now, most the air is going around your intercooler instead of through it.

[05'WRB]

Originally Posted by halfelite

This is actully not all that true. The drivers side of the car has more heat as its more compacted together were as "trubo" side gets a lot more air flow under track stress were the turbo is spooling a lot then yes but under normal conditions even spirited driving more heat is trapped on the driver side. If you see my post here NASIOC - View Single Post - Aquamist (Water injection) questions and answers here...

I took some thermal imaging and the corners of the tmic closest to the front of the car get the most heatsoak.

Good stuff. As I had expected, all the air if mostly directed/deflect towards the back of the scoop/ic. So if we can get some cooling towards the front of the tmic would be good. That's we the fan/fans come into play.

[05'WRB]

Originally Posted by snorky

you would need a bigger fan with a higher flow rate than that or two of them.

you'd combat a lot of heat soak and hot spots with a diffuser (the factory one works very well) and a seal around your intercooler. as it stands now, most the air is going around your intercooler instead of through it.

I'd agreed. Preferably 3 fans. In reality, I don't need to do this for my street driven car but I just want the challenge.
Since I still have an extra one sitting around, I may just put another one in there?

[TAPOUT]

Good idea, but I think the plastic fan is going to melt.

[snorky]

Originally Posted by TAPOUT

Good idea, but I think the plastic fan is going to melt.

The IC doesn't get that hot. Search NASIOC, it's been done before.

[05'WRB]

Originally Posted by snorky

The IC doesn't get that hot. Search NASIOC, it's been done before.

I'd just look at couple guys that did the fan mod on Nasioc. Had some very good ideas. One guy had the whole tmic covered and add 2 fans, while the other guy did 3 fans but none over the tmic.
The one with the 2 fans basically took away the normal function of the hoodscoop while the car is moving. I didn't want to do that with my mod; keep the stock function, and while add small fan/fans (that doesn't impede air going throught the scoop) help to draw more air into the front part of the cooler where no/or very little air was directed/deflected to front area anyway. I don't need to have my fans on during normal driving where as he needs to have his on most/all of the time. All good ideas doing about differenctly.

[snorky]

do you not run the stock diffuser and seal or were they removed just for those pictures?

[halfelite]

I think a more ideal approuch would be to fab up a little metal peice to direct airflow down right at the end of the scoop so some air is directed straight down. Im going to do more test once i get my cai installed im wondering it the removal of the snorkus will bring down the temps in the front.

[snorky]

Originally Posted by halfelite

I think a more ideal approuch would be to fab up a little metal peice to direct airflow down right at the end of the scoop so some air is directed straight down. Im going to do more test once i get my cai installed im wondering it the removal of the snorkus will bring down the temps in the front.

how would removing the snorkus affect IAT?

[halfelite]

Originally Posted by snorky

how would removing the snorkus affect IAT?

If you look up at my nasioc post with the thermal images you can see all the heat is towards the front of the tmic were there is no airflow and more compact Removing the snorkus could cause more air to enter at the hood and flow towards to ic eliminating some of the heat.

[snorky]

Originally Posted by halfelite

If you look up at my nasioc post with the thermal images you can see all the heat is towards the front of the tmic were there is no airflow and more compact Removing the snorkus could cause more air to enter at the hood and flow towards to ic eliminating some of the heat.

oh you're talking about removing the inlet snorkel that connects to the snorkus.


the hood is sealed up front... unless you remove the seals, you're not going to get more flow.