Can I Make use of the Hood Scoop on my Subby

AngelOfDarkness

AngelOfDarkness

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So I have a '99 Outback Legacy and have been looking at that hood scoop that is purly for looks as I can tell, has anyone modded that scoop to work as an air intake??? I mean I haven't been able to find a cold air intake, but was thinking I could use that as a ram air (same concept as a cold air intake if I am right). Thanks in advance
 
You could use the scoop if you decide to run an oil cooler. It would mean the cooler is not prone to offroad type damage.
 
Not really. Some have used it for an intercooler, but what it will do is suck in all those leaves rain snow and ice if you just open it up and dont design it properly.

nipper
 
Well yes I realize the crap that could get in it, that's why I am asking if anyone has done it so I can get an idea of how to build one and prevent crap from getting in
 
all to hard i reckon. as a cold air intake i'd be worried about the filter getting wet. as an oil cooler, just to hard for what? if your N/A you dont really need it. i would leave it as a good freash air circulation around your engine.:shrug:
 
The other problem with the sccop is that if you are not using it to cool something like the TMIC or oil cooler, it creates drag and affects fuel economy. If that is a concern?
 
And it wont be a ram air - they do that on some bikes and these usually have a very short and straight intake path. Even then its designed to get a bit more power at high speed - like an extra 10hp @ 250+km/h - not something thats going to be overly noticable.

Not hard to do the maths to work out how large an opening you would need so that the intake is "passing" the required amount of air.
Hmm - the amount of air used is proportional to revs.
And the amount of air passed is proportional to speed.
But since revs and speed are related by gear ratio - then it doesnt matter what speed you pick, just what gear!

So (guessing) in top gear at 100km/h its doing 3k rpm, its a 2.5l engine.
So using (paste this into google search)
sqrt(2.5/2*3000l/minute / 100km/h / pi)*2 in inch
that tells me you need 2 inch (diameter) tube!

I will leave it to others to check my equation and dont you love google calc!

yes - I really am that nerdy.
But I think its good to work these things out and see how sensible these ideas are.
In this case - its myth possible.
If your intake and tubing is bigger than 2 inch then you possible "swallow" air faster than the engine sucks - meaning a slight increase in pressure (it would be very small - this is not a supercharger!)
But its feasible that this could be better than just letting the engine suck air.
 
Yeah see there won't be an air resistance as it's already there so I would be making use of it. Also I by doing this I hope to achieve alittle more performance out of my engine (i am a speed demon and there is a long story how I got this car, but I really didn't get a choice even though my money was used). I mean I would love to supercharge it (HINT!!! if anyone knows), but to do that I think I would have to get new piston rods (atleast) and maybe new valves
 
turbo technology has moved on, I understand, a lot more than supercharging which is why I reckon most manufacturers use it. And it would be so easy to turbo what you have compared to throwing a blower on it. One way you can get more grunt from your standard Forrie is to bypass the resonnator and ram air directly into the filter box. The noise nazis might get upset and you might find it annoying at times, but I know someone who tested it on the dyno with modest gains.
 
The supercharger can be done without mods to your motor - the bearings and rods will hold up fine, best if the bearings are new but they'll be fine if they're not slapping around already.
Google Raptor superchargers - I've seen this installed on another forum on an EJ22 in a grey import MY hatch (oz). It goes well from the passenger's perspective ;)

If there was a performance upgrade I'd do for my EJ, it'd be a supercharger - secondhand though :D

Cheers

Bennie
 
If your going to spend money doing it up, selling it and buying a turbo one would be your best bet. Whatever you do, gains are negligible compared to forced induction.
 
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