Cold Air Induction for ITBs

[speedpenguin]

So I've been researching ITBs for my Acura and have run into an area that affects anyone who wants to or is currently running ITBs, and that is the buildup of hot air in the engine getting sucked into the intake. Obviously for the drag racers out there it's not as big of a deal, but for longer track and backroad bombing the loss of power would probably be annoying. I'm posting this here because whatever we discuss here would be equally beneficial to anyone running an A20A with ITBs (All 1 or 2 of you )

Anyway I am trying to come up with a way to route cold air into the velocity stacks. I could just fab a cold-air system from the wheel well, but it seems like that would restrict airflow too much to be really beneficial.

Here is what I have come up with so far:
An airbox/heatshield assembly built around the openings of the velocity stacks that sits flush with the bottom of the hood, essentially sealing the air in that area from the rest of the engine bay. Air would then come in vented through a hole cut in the top of the hood a la the evo-style hood. A carbon-fiber or similar aftermarket hood would have to be used for this application. Obviously in street driving filters will have to be installed in the velocity stacks, but they should be there anyway.

Here are some extremely shitty diagrams I drew in Appleworks 6.





I think this setup is the most ideal for airflow and air temperature, but I am by no means an expert. The only problem is of course that when it rains you are essentially driving a car with a funnel running into the intake. So here is the main problem. How would one route air into the stacks in an efficient manner like this, but still keep water out?

[Vanilla Sky]

cut into your cowl area (where your wipers are) and pull the air from in there. box everything up and have that one side open.

[gp02a0083]

here is an idea , look up the airbox for the AE111 carolla i think its a 4AGE engine and came with ITB's its got a odd air box style to it, look that up and a possable way after that is running a large single pipe for the CAI or split it into 2

[A20A1]

cut into your cowl area (where your wipers are) and pull the air from in there. box everything up and have that one side open.

Yup run straight back into the gutter behind the wind shiled wiper area. Just be sure you filter it or put a baffle and a screen to block water and crap that gets back there.

[speedpenguin]

That gutter thing sounds good, but does anyone have a diagram or something of what the baffle would look like?

[rjudgey]

Wouldn't just apply to ITB's but Weber DCOE's as well as Bike carbs too. with a effective hood scoop you could also get a ram air effect going on so that the faster you go the more air gets sqaushed into the intake

[speedpenguin]

So is this essentially what you guys were talking about?

[Vanilla Sky]

remember that the cowl area is a high pressure area on these cars, while anywhere on the hood is low pressure. putting the intake in a high pressure location will give you what is called a "ram-air" intake, just as rjudgey pointed out.

[MessyHonda]

just slap a turbo on that baby ......on a serious note...how much is the set up going to cost you?

[Vanilla Sky]

i've seen bike ITBs end up costing less than $1000 if most of the work was done by the owner.

[MessyHonda]

i've seen bike ITBs end up costing less than $1000 if most of the work was done by the owner.

they only give you like 30 more hp right?

[Legend_master]

Check out this all motor H27 setup



H-T h27 thread

[speedpenguin]

I was just thinking of small filters in each of the stacks.

And as for the cowl/hoodscoop option, I'll do it if I have to, but I really don't want an ugly-ass lump of any kind sitting on my NA setup. I'm still trying to figure out the option Mike laid out, it seems cheaper and more subtle. I want a sleeper here.

[Zufer]

with my quad carb setup i'm trying to figure out a filter system as well. My choice so car is running a hood scoop and either just run a screen over the carbs or making a box to hold a panel filter for the carbs. Haven't decided completely. Also with the cowl setup how would you box it off because the engine moves quite a bit when under load?

[nzBA1lude]

a subaru wrx letterbox scoop would look good and still be able to keep your car looking reltivaly sleeper if you wanted

[speedpenguin]

Well it's an old thread, but not a bad idea at all.

[mushroom_toy]

You could try cutting up an old exhaust manifold or something that was a sorta straight through design and run a single pipe fro the front of the car, or from a collector on the cowl, sorta like a cai or cai/ram air setup. Heres two ideas i had...yes I know they are crappy drawings. lol


This is the air coming from front of car design.


Coming from cowl area.

[ChaseR]

What about direct exhaust injection???



prob a much better idea.

[ChaseR]

not tha your idea is retarded, Your drawing reminded Me of that pic! lol

[ghettogeddy]

remember that the cowl area is a high pressure area on these cars, while anywhere on the hood is low pressure. putting the intake in a high pressure location will give you what is called a "ram-air" intake, just as rjudgey pointed out.

that would be a good thing right

[2drSE-i]

Most filter boxes for ITBs kill me. It wouldn't breathe as well as opened-up due to them putting one filter on one side in a plenum configuration.

Personally I'd go for a cowl or hoodscoop with a large surface area K&N panel filter, or dual CAI tubes (one on each side.)

i have actually been working on this problem for my car (future plans only, but i have a really good gameplan already.)


my idea was to build a filtration box that covers the ITB's, with two sealable panels. One attaches to the hood scoop, one facing the firewall. That way if it rains, just seal the hood scoop up. Good weather = seal the firewall one up.

[MessyHonda]

why not turbo?

[speedpenguin]

not tha your idea is retarded, Your drawing reminded Me of that pic! lol

It's cool, that pic made me laugh.

And no turbo, thanks. I know it's not too hard to build a reliable setup, but it's still less reliable than NA. There's just more parts to break.

[Zufer]

This is the setup i built. It gets some cold air down by the axle. If it was desired it could be routed to to the fender or something quite easily.

[2drSE-i]

This is the setup i built. It gets some cold air down by the axle. If it was desired it could be routed to to the fender or something quite easily.

doesnt look pretty but it sure as hell gets the job done. It almost disguises the ITB's, but i bet you still get that incredible sound huh?