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Old 06-24-2020, 04:21 PM   #1
603boostfreeordie
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Default Modifying hood scoop

Has anybody attempted to redirect air flow from the hood scoop directly to the intake. 2012 wrx Iím swapping to FMIC wondering how I want to make my own ducting system to send air to the intake using the hood scoop.
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Old 06-24-2020, 04:58 PM   #2
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Are you talking OEM air box or something else?

You'll have to construct an air box to connect to the bottom of the scoop with some type of elbow connection, run hosing to the air box, and construct some type of elbow to connect the hose to the air box.

Can it be done? Sure.
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Old 06-24-2020, 08:30 PM   #3
603boostfreeordie
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I have the Cobb air box and know that it will be in the way for this fmic setup, so Iím trying to mitigate the losses of altering the Cobb air box while keeping the hood scoop functional. I know it CAN be done weíve put guys on the moon before. Iím wondering if anyone else has created a similar setup. Not looking to unlock some secret performance factor, just seeing how other people have constructed their ducting if anyone has even done this before. I get the concepts of how to move air, Iím more looking for the practices. Thank you though.
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Old 06-24-2020, 08:50 PM   #4
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Quote:
Originally Posted by 603boostfreeordie View Post
Has anybody attempted to redirect air flow from the hood scoop directly to the intake. 2012 wrx I’m swapping to FMIC wondering if I can make my own ducting system to send air to the intake.
it just takes you cutting stuff up, if ou dont want to cut than no probably isnt going to work
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Old 06-24-2020, 10:16 PM   #5
603boostfreeordie
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Ok Iíll edit the post. letís change the focus here to HAS ANYONE DONE THIS. Iím thinking of making a small duct out of fiberglass. I understand itís possible and will require modifications, which will require tools, which will require hands to use them.
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Old 06-26-2020, 10:00 AM   #6
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Been on here for over 10 years and haven't heard anyone doing it. Can it be done sure, hell anything can be done with fiberglass and enough patience. Just look at the new Lamborghini SCV12. I will be difficult because it will have to be flat and have a 90 or 180 degree curve to connect to the turbo inlet.
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Old 06-28-2020, 08:06 PM   #7
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This is America and you are free to do what you like, but having been on this forum since Nixon was in office, I have seen 3,872 people do 872 different home grown intake tricks on Subarus. They all net 0HP and 0TQ as this ain't your Cousin Jimmy's Mustang. Ram air don't work on a turbo. Full stop. And even if it did work, which it won't, you can't go messing with the intake without tuning as moAr air=moAr leaner = moAr hotter = pistons leave the vehicle through the fenders.

Want some more noise and power? Get a commercial intake and tuning to support it.
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Old 06-28-2020, 10:19 PM   #8
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Make a snorkel, have it coming out from the hoodscoop(that way itís still functional). Couple of pvc pipes from your local hardware store, couple of 180* bends mixed with a few 90* turns. Youíd be surprised what you can make. And how effective the larger diameter pipes are. (Of course with tuning) pvc is not hard to tune for. Just have to give the tuner the sizeĒ

You know the saying.... cool air rises, hot air falls.

Hope this helps
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Old 06-29-2020, 08:45 AM   #9
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Quote:
Originally Posted by 603boostfreeordie View Post
Ok Iíll edit the post. letís change the focus here to HAS ANYONE DONE THIS. Iím thinking of making a small duct out of fiberglass. I understand itís possible and will require modifications, which will require tools, which will require hands to use them.
Yes someome did it, I remember it in detail. However they did not do it in the way you are describing. What I saw someome do was build a custom turbo set-up that was turned toward thd hood scoop with an air box mounted under the scoop with a pannel filter.

The end result/conclusion was that it was no better then a normal style intake with an airbox.
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Old 06-30-2020, 12:59 PM   #10
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Quote:
Originally Posted by Unabomber View Post
This is America and you are free to do what you like, but having been on this forum since Nixon was in office, I have seen 3,872 people do 872 different home grown intake tricks on Subarus. They all net 0HP and 0TQ as this ain't your Cousin Jimmy's Mustang. Ram air don't work on a turbo. Full stop. And even if it did work, which it won't, you can't go messing with the intake without tuning as moAr air=moAr leaner = moAr hotter = pistons leave the vehicle through the fenders.

Want some more noise and power? Get a commercial intake and tuning to support it.


I have an aftermarket intake with an air box. Iím not trying to achieve more volume Iím trying to keep intake temps as low as possible, to counter any negative effects of running the hot side of my fmic past the air box which will possibly require modification of the air box. Cousin jimmy is looking for more volume in his stangs intake thatís why ram air helps him. Ram air benefits us however through lower intake temps, which without a doubt is a factor of performance. Also the car will obviously be getting tuned do to the fmic, which I would consider messing with the intake . However creating a ram air setup dumping air on the intake would not create any need for tuning as itís not increasing any actual volumes just the readily availible supply of cold air. I appreciate everybodyís input Iíll post some pictures of my first prototype, still waiting on the FMIC from ETS
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Old 06-30-2020, 03:59 PM   #11
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Quote:
Originally Posted by Scuby04STi View Post
Yes someome did it, I remember it in detail. However they did not do it in the way you are describing. What I saw someome do was build a custom turbo set-up that was turned toward thd hood scoop with an air box mounted under the scoop with a pannel filter.



The end result/conclusion was that it was no better then a normal style intake with an airbox.


That is an interesting idea. Iím thinking this might be a bad idea now, Iíll just be adding weight and resistance for probably a minimal cooling effect
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Old 06-30-2020, 05:10 PM   #12
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i think that it "could" be beneficial if you were to do your own custom header/dp etc work but like stated above probably minimal gains if any...great idea though to keep it functional...i have always loved the hood scoop so if/when i go front mount will be disliking the top of my engine getting dirty from the open scoop
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Old 06-30-2020, 08:33 PM   #13
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Check out how race built/ rally subies "create/ route" ducts to cool of turbo and other miscellaneous items inside engine bay.
Usually half of the duct is in the engine bay, the other half is on inner portion of hood.
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Old 07-02-2020, 04:45 PM   #14
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Originally Posted by danger1138 View Post
Check out how race built/ rally subies "create/ route" ducts to cool of turbo and other miscellaneous items inside engine bay.
Usually half of the duct is in the engine bay, the other half is on inner portion of hood.


Good idea maybe I can use some similar materials as the brake cooling kits
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Old 07-03-2020, 11:02 AM   #15
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Quote:
Originally Posted by 603boostfreeordie View Post
Good idea maybe I can use some similar materials as the brake cooling kits
Its not really so much about the material, more about ensuring there is proper routing to area you want cooled off.
Ive seen those who have gone FMIC, and put an after oil cooler in place where the TMIC used to be.
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Old 07-03-2020, 11:20 AM   #16
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also remember that you want laminar air flow. the intake snorkel and hood scoops and the air filter have fins that help create this, but the more crazy funky right angles that you add, the more turbulent the air becomes.

when you have turbulent air, it means that your sensors aren't necessarily seeing an accurate picture of the true air flow. think about it like a harmonica - when you blow on it consistently, you get laminar flow through the device and the "notes" are harmonic. If you were to pull your mouth back and blow on it through a fan, your notes would sound choppy

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Old 07-04-2020, 03:13 AM   #17
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The last Subaru WRC cars used the scoop for the intake / air filter
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Old 07-04-2020, 08:23 AM   #18
603boostfreeordie
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Quote:
Originally Posted by Gerdinator47 View Post
also remember that you want laminar air flow. the intake snorkel and hood scoops and the air filter have fins that help create this, but the more crazy funky right angles that you add, the more turbulent the air becomes.



when you have turbulent air, it means that your sensors aren't necessarily seeing an accurate picture of the true air flow. think about it like a harmonica - when you blow on it consistently, you get laminar flow through the device and the "notes" are harmonic. If you were to pull your mouth back and blow on it through a fan, your notes would sound choppy


I see what you mean, but no sensors will
Be in play Iím trying to provide cold air around the intake box not plumbed directly into the intake
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