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Old 07-19-2002, 12:40 AM   #1
MattDell
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Default MY02 2.5RS with a hood scoop..

Would it be beneficial to have a hood scoop on a 2.5RS? I heard that the extra air coming into the engine would increase horsepower, though at the same time I think it will increase drag at the same time. Would the drag override the horsepower or would it just slow it down? I'm no car expert so sorry if this is such a n00b question. Thanks.
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Old 07-19-2002, 01:07 AM   #2
180 Flip(Megatron)
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I due belive that you would not see any hp gains, unless you ran a ram air intake set up to the inlet of the hoodscoope. As for drag im not sure. I can tell you with out a doubt that the wrx hood is much lighter than ours(o2 ej25) so that is benifical. As far as i know the only choices with that are swaping to a wrx hood, of going cbf. Im screwed because the wrx is not offered in the midnight blue, so cbf is my only route. Im not in favor of having someone cut into my hood just to pluck in a hoodscoope.


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Old 07-19-2002, 01:40 AM   #3
windfactory
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using hoodscoope on RS...
change to CBF is for losing weight...hoodscoope can get more cold air into the engine bay which maybe good idea, but it also is the problem for the rain/water attack....
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Old 07-19-2002, 01:48 AM   #4
Reciprocity
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I ran an intake that used the open hood scoop on my RS for at least a year...through full rain, and the car hasn't been effected at all...other than the filter gets dirty pretty damn quick.

NC
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Old 07-19-2002, 01:02 PM   #5
Craig W
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You'd have to be going so far beyond any legal speed limit to see any kind of "Ram Air" performance boost. Plus, You'll get a significant increase in drag. You can get better cold air from the front fender than from a hoood scoop intake mod. One thing a scoop does make faster is the dirt build-up in the engine compartment.

Except for the weight benefit from going to a carbon fiber hood, there's not really any benefit to having the scoop. Well, it does look cool. But that's a topic for the style forum.
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Old 07-19-2002, 05:36 PM   #6
MrHorspwer
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WRX hoods are stamped from aluminium and weigh significantly less than our stamped steel hoods. Though, unless you can find a take-off WRX hood, it'd probibly be much cheaper to buy an aftermarket carbon fiber hood for the weight savings.
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Old 07-19-2002, 09:28 PM   #7
MattDell
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What if I used a top-mounted CAI with it?
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Old 07-20-2002, 02:12 AM   #8
Craig W
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You could do that, but you won't really get much more of a benefit than you would removing the air snorkel from the right fender and just pull cold air from there. In stop and go traffic, the top mount intake would be hotter than the fender intake due to the heat of the engine warming it from below.

The shorter intake path of a top mount cai will cost you some low-end torque, but give you a little better top end. A top mount cai will collect more dirt than a fender cai too.

Plus, you'll still have a higher drag coefficient w/ the scoop, meaning less fuel efficiency.
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Old 07-20-2002, 05:07 AM   #9
jay_nite
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I have posted a simular post a week ago, and asked how practicle it is to swap a WRX hood for my RS, and the responses i got was " go for it!! "

and i was lucky enough to find someone whos' willing to sell his WRX hood for a really good deal. The installation was easy and during the process my friends and I did feel the weight difference between the RS and WRX hood... the WRX is just so much lighter in comparison.

After the installation i did a timing for my car to see if it really made any difference for 0-60. the result was "NO" I got 10.0 sec prior and after the installation

But the purpose for the swap was because i met a guy w/ a 02 RS and he's got the STi scoop, and told me there's is making a top mount CAI for the MY02 RS which requires the scoop for the air.

heres' the link to the pix:

http://www.rs25.com/Forums/showthrea...&threadid=3689

So far, i have just done the swap, and will get the CAI probably sometime next month!~~

I would say "GO FOR IT!!!"
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Old 07-21-2002, 09:08 PM   #10
MattDell
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Yeah, that's what I'm gonna do (the top-mount CAI).. I just need to find a good deal on a WRX hood. Anyone know what it is straight from the factory?
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Old 07-22-2002, 12:50 PM   #11
Jejunum
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so the consensus is; there is no worries with water into the engine through hood scoop right? if i wanted to be sure that it wasnt an issue what would u guys recommend?
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