I've been thinking of a better way to do "Cold Air intake" and i think this one has potential.

It borrows a little from the headlight scoop idea but instead of being in the headlight cover, the scoop is in the hood just behind the headlight.

The scoop would lead into an insulated sealed box where the air filter would be located.

This is NOT going to be and argument thread wheter or not it's worth it, blah, blah, blah. I just want to know if anyone seens any MAJOR flaws with this idea (either way i will likely go through with it but it might change my performance expectations), so any insight would be appreaciated.

Oh yeah and if this has been done before please post pics!!!

 

that actually seems like a good idea...the only problem i see with it is the actual scoop part because you are going to have to modify the stock hood or get some fancy aftermarket hood with that scoop design in just the right location

 

looks good to me i would go for it but i would use a steal hood cause its gonna b hard to weld that aluminum hood to get that scoop in there

 

It shouldn't be a big deal to cut a hole in a hood and stick on an inverse scoop. You will need some skill and/or some money if you want to make it look nice.
I see two potential problems with this idea:
First is that (According to the airflow chart) only the nose of the car sees high pressure, so unless your scoop is placed far enough forward you'll most likely be drawing vacuum at speed. You might be able to get far enough forward by slotting the headlight cover as part of the scoop, but I don't know if it would be enough to divert the airstream to your box.
Second, it looks like having the scoop right above the filter would be an invitation to rainwater and debris. Have you planned any kind of splashguard/diverter? (It could also reduce intake honk.)

 

i have seen one like that here in calgary, A guy i used to hangout with had a brother with a subaru imprezza scoop place there and he said it worked good. i would think that you would have to use a good size scoop to see any benifits through. i am un shure if an "indent like scoop" as you have drawn would be that good and also with the headlight up i dont think it would give any ram air effect. i have no real experence doing thing like this but it is just ow i think it may work. if you go through with it i would like to see the pics and if it worked. i gues the only real way to know is if you do it.

 

intake honk?

 

Yeah, I wanna see pics too if you try it. Doesnt sound like its gonna work very well but its worth a shot.

 

My plan was to simply cut into the hood, bend down the scoop part, and weld (or epoxy) in some sides.

I am planning to use some sort of screen to block leaves and other larger debris, but the rainwater thing was something i hadn't considered, i'll see what my brain conjures up about that.

I figure if i make it big enough, not massively huge, more of a "scoop" rather than a "vent", it should draw in enough air.
Which brings up a question of mine, is it possible that i could make the scoop TOO big, so big that it would affect the intake from working properly, although i don't know how it would?

I figure when the headlights are up, it's probly night so the air is cold anyway, but i'm thinking about making the scoop offset slightly so it is not directly behind the headlight so that even when it is up, some of the scoop will still be exposed to direct airflow.

When i go through with it i will be sure to take pics.

 

I understand there will be many people with their doubts about this idea but i figure it can't be worse than 2 feet of piping running through your bumper and fender, just so you don't intake engine bay air. And i think it'll look really cool.

 

The major flaw in your thinking is that a high pressure area exists just behind the headlights. Please look at this picture and take note the direction of the arrows. Those are force vectors. See how they point inward at the very front of the car? That is a high pressure zone and the reason the radiator is put there. The only other place you could put an intake is just in front of the windscreen also known as a cowl induction hood. All those people who buy those stupid headlight ducts are wasting their money and so would you be to if you chose to execute your design

 

wow where'd you find that diaghram. an others? maybe for a t2? or atleast one with a spoiler just to get an idea of how those differnt parts affect the airflow

 

+1 for the pic...it's given me some idea's for my CAI set-up...

 

The point is, all of this would be soo much work for such a little gain.

 

If the intake is an actual raised scoop, rather than a sunken in duct, then the positionning of it is far less important. It will also injest far more air for a given opening size than a duct. That's why my headlight cover is a scoop, not a duct, that way I could make the opening far bigger as well.

Headlight ducts work just fine, I see no reason to do a hood scoop, hoods are more expensive to replace and are harder to work on, besides, the air has a straight shot to the intake from the headlight cover, whereas from the hood it has to go down.

 

Updated scoop drawing.

 

Once you cut some holes, that is.

 

And never drive at night.



Unless you have the stupid riceboy headlight mod pot smoker FC thingie.

 

It's the same body

/Mr. Obvious

 

but it has a lip, a different hood and a spoiler which will change those high and low spots a bit.

 

Now what if i completely moved the intake box to just infront of the windshield, possibly where the cold start is. Then it would be okay to use an inlet duct. Positioning could be similar to the R34 GTR v-spec II (pic), but on the passenger side.

 

I think that aerodynamic chart often not used correctly. I think it shows RELATIVE pressures, possibly to a baseline that is of positive pressure.

I find it hard to believe that my FTP lens and the the body molding above it are in negative presure(vacuum) when I'm going 80 mph on the freeway.

I think it only shows where a scoop would be optimal and not that one wouldn't work elsewhere.

 

whaa???

 

i just came up with a random idea, why don't you tape a bunch of little strips of plastic or fabric on your hood and go drive around, should work like watching the tales on a sailboat huh?

 

They show low and high pressure. A scoop could work anywhere, but for the intake you want the high pressure air.

 

wut happens when it rains???