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Old 04-11-2003, 09:42 AM   #1
slinger99
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Default Question about sti hood scoop?

My dealer says my car will be here in june. And when it gets here there is damn good chance that Iam going to remove the wing from the trunklid or the trunklid it's self, (whatever I gotta do so I don't have to look at it any longer than possible) and try to get a wrx spoiler instead.

But untill I see the car in person I have'nt made up my mind as of yet about the hood scoop. There are a lot of young neighborhood kids where I live, and Iam afraid of one of them
crawling in there and getting stuck.

My question is will the intercooler be less efficient if I replace the massive sti hood scoop and put a much smaller wrx unit in it's place? Given that this is even possible to begin with.
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Old 04-11-2003, 10:05 AM   #2
metoo
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I thought about the exact same thing. It's not certain that I will be getting one, but if I plans continue, I thought about saving a grand of the downpayment for a FMIC for imediate installation if for no other reason, just to get rid of that storm drain on the hood. If not, I would like to get a regular '03 WRX scoop until such time. I believe bigger is better (powerwise) as long and the flow path makes use of the larger opening. I personally believe that a '03 WRX scoop with an air splitter will be just as effective (if not more effective) than the stock STi scoop. This is assuming that the STi scoop is the same width. Will a '03 fit? I don't know.
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Old 04-11-2003, 11:05 AM   #3
StiDreams
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I'm not sure I like the BFW either. But I may be willing to live with it. Or it might even grow on me. I definitely not thrilled about the giant hood scoop. I don't know that I will do anything about it though. FMIC + new scoop/hood would probably be in the 1700 - 3000 neighborhood (depends on just scoop or all new hood). That's a lot of greenbacks for just looks. I have not decided if I'm going to mod for power yet. If I decide to go for more power after 300 hp looses is wow. If that's the case then I'm definitely doing a FMIC. Hopefully a hood with a vent like the EVO's will be available at the same time so I can give the scuby a rhinoplasti.
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Old 04-11-2003, 11:29 AM   #4
oresama
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Default

looks like we have similar ideas. rather than replacing the sti hood scoop with the smaller wrx scoop i was wondering if using a reverse scoop would have any detrimental effects on performance. at first i thought that less air would flow over the intercooler but then i read somewhere that there is a vacuum effect created at the base of the windshield at speed which i assume would help funnel air into the reverse scoop. but, i haven't found any specific info to back that up.
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Old 04-11-2003, 11:34 AM   #5
Corn-Picker
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Quote:
Originally posted by oresama
looks like we have similar ideas. rather than replacing the sti hood scoop with the smaller wrx scoop i was wondering if using a reverse scoop would have any detrimental effects on performance. at first i thought that less air would flow over the intercooler but then i read somewhere that there is a vacuum effect created at the base of the windshield at speed which i assume would help funnel air into the reverse scoop. but, i haven't found any specific info to back that up.
I have seen data that underhood temps decrease when reverse scoops are put on, but I avoid them personally. I tend to think that reverse scoops "cool the engine comparment" by sucking hot air over the intercooler and out of the engine bay. I may just have to stick the thermocouple of my fluke multimeter in the rubber hose before the throttle body to see how temps increase/decrease with/without scoop, after heatsoak, after water spraying, etc...
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Old 04-11-2003, 11:52 AM   #6
ewt
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Somewhere I read (I think it was on this board, but I can't find it) that the old WRX scoop was getting cool air to only about 1/2 the surface of the intercooler, and I would imagine that this would be worse for the larger intercooler in the STi. Perhaps the new one is better. Also, I believe that the largeness and the new shape of the STi scoop were purely functional designs-- unless you go with a whole FMIC setup, I wouldn't mess with it.

FWIW, regardless of what you think of the BFW, it does help draw attention away from the BFS; I think without it the scoop would stand out even more.
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Old 04-11-2003, 03:00 PM   #7
HFTuRbo
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Arrow Scoop

Have not seen one in person, so this is only from looking at the pictures observation...
It seems that 100% of the air entering the opening is going to be striking the intercooler grill. The grill looks to be centered more so than the way the WRX 02 gets split air.
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Old 04-12-2003, 11:41 PM   #8
metoo
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Default Re: Scoop

Quote:
Originally posted by HFTuRbo
Have not seen one in person, so this is only from looking at the pictures observation...
It seems that 100% of the air entering the opening is going to be striking the intercooler grill. The grill looks to be centered more so than the way the WRX 02 gets split air.
Being centered has nothing to do with it. Air could still jest hit a small area of the TMIC.

Quote:
Originally posted by ewt

Somewhere I read (I think it was on this board, but I can't find it) that the old WRX scoop was getting cool air to only about 1/2 the surface of the intercooler, and I would imagine that this would be worse for the larger intercooler in the STi. Perhaps the new one is better.............FWIW, regardless of what you think of the BFW, it does help draw attention away from the BFS; I think without it the scoop would stand out even more.
That's why I said that I would use the smaller '03 WRX scoop with a air splitterp

What's a BFW and BFS?

Quote:
Originally posted by Corn-Picker
I have seen data that underhood temps decrease when reverse scoops are put on, but I avoid them personally. I tend to think that reverse scoops "cool the engine comparment" by sucking hot air over the intercooler and out of the engine bay.
That's why you don't use a reverse scoop on a top mount air-to-air innercooler. Use the reverse scoop after converting to a front mount innercooler.

Quote:
Originally posted by StiDreams
I don't know that I will do anything about it though. FMIC + new scoop/hood would probably be in the 1700 - 3000 neighborhood (depends on just scoop or all new hood). That's a lot of greenbacks for just looks.
I figure a FMIC will cost about $1400. A painted reverse scoop, abotu $250. The STi scoop sold in new condition about $200 (maybe), Sti innercooler sold new new, $300. So maybe you would be only $900 out of pocket and not with just looks improved, but reduced heat soak, more cooling capacity, higher visibility, and lower center of gravity ....well you will add a bit of weight and all the way front at that
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Old 04-13-2003, 02:36 AM   #9
StiDreams
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Can the scoop be just reverse without much to do? Will it sit/cover the original footprint in the reverse position without some modification to the hood or the scoop? There may be some costs associated with that.
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Old 04-14-2003, 09:47 AM   #10
metoo
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Quote:
Originally posted by StiDreams
Can the scoop be just reverse without much to do? Will it sit/cover the original footprint in the reverse position without some modification to the hood or the scoop? There may be some costs associated with that.
You can't do this on the current WRX. The footprint is not symetrical from front to back. Plus you wouldn't want to do this with the TMIC still in use.
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Old 06-25-2003, 11:26 PM   #11
makofoto
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how about using the '04 WRX hood scoop ... same style ... just smaller ... and probably fits.

The FMIC might lower your CG a bit ... but it will hurt by creating more polar momentum ...
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Old 06-26-2003, 12:59 AM   #12
e-brakin
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Default Re: Re: Scoop

Quote:
Originally posted by metoo



What's a BFW and BFS?

Only guessing here but Big F'ing Wing and, yep, Big...Scoop.
Right?
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Old 06-26-2003, 01:14 AM   #13
akoshy
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My personal opinion is that changing the hood-scoop for a smaller one, would be a bad idea. I would have purchased a car with a front mounted intercooler, otherwise.

I would assume that Subaru engineers have done their due diligence and extensive testing with the hood scoop and would not want to second guess them, based on ideas from "armchair engineers".
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Old 06-26-2003, 11:43 AM   #14
Pre-diddy
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With a reverse air scoop pulling air up, that would lessen the effectivenes of the IC water spray as well. Not only would less H2o hit the IC, it would also spray all over your windshield. If you go to FMIC, I guess you would have to worry. Why do you need a 03 hood scoop? Why not swap with someone with 04 WRX? Same shape/overall appearance, with less size.

IMO, just leave the stocker on, unless you are gong to upgrade to FMIC, and simply dont need the scoop anymore.
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