Intake Idea

[oab_au]

There is no problem getting air into the engine. The flow through that pipe and box, is at a low velocity. It is not like the high velocity in the inlet tract. The way the inlet works on full throttle, is the IRIS valve has opened to join the two haves of the inlets together.

This makes a large chamber that includes, all the inlet tracts, both throttle bodys, the box in front of them and the air delivery pipe. This whole chamber is very close to atmospheric pressure, so it is as if the 6 inlet tracts to the cylinders are breathing from the atmosphere and the rest of the inlet does not count. The chamber acts like a big sponge, that each cylinder pulls its air out of. So the shape, the bends, the wrinkles, don't count.

Harvey.

[NikFu S.]

Originally Posted by oab_au

both throttle bodys,
Harvey.

Is there a time both throttle bodies do not open?

[oab_au]

Originally Posted by NikFu S.

Is there a time both throttle bodies do not open?

Only when you get out of the car Nik.

Harvey.

[Chiketkd]

Originally Posted by Myxalplyx

Also, what is the curb weight of your car Chike? I need to be able to put this in the G-Tech.

Kevin,

Weight is around 3,450lbs with a 1/3 tank of gas and the weight reduction I've done (lightweight wheels, exhaust system, etc). If you take out the spare tire and tools, use a weight of 3,405lbs.

The intake looks just fine Kevin. I realize you're testing different set-ups to learn what's best for making the most power - so I'm not insulted at all, actually quite pleased!

-Chike

[dmnknightomega6]

SOme thoughts:

Since we have 2 different lenghts of piping on the "Y",consider the following facts:
a) Different air volume at all times
b) Different pressure at all times
c) Volumetric pressure for MAF sensor calculation of ideal combustion rate is assumed to be constant on all cylinders in a full cycle of the crank.
d) Super or turbochargers can achieve letter c due to it pumping air pressure in the airsupply by pressurizing it.
e) as mentioned in the thread, NA problems only occur at high end, what we want is to get a constant curve on the graph: hence increasing volume compression of air at higher speeds.

I Like the idea of a Y pipe at the entry itself, and what if we simply increase the dianeter of the pipe going there instead of having two? that way we maintain minimal volumetric pressure discrepancies.

A Wide oval pipe with a better MAF sensor to a semi industion-box type filter unit And Added to it a small diameter auxilary intake?

Just my thoughts on driving home......

BTW... Where did you guys get the cone fiter adapter?

[Myxalplyx]

Originally Posted by dmnknightomega6

BTW... Where did you guys get the cone fiter adapter?

I can not remember. I found mine in the garage. Some help right? Perhaps this is adapter is the same adapter as the one for the Impreza since this adapter is what I believe I used on that car. It does not look like the adapter I have used to test intakes on the XT6.

[Jade Dragon]

i have also bee thinking of what would need to be done to run 2 MAFs, it the only thing that would make it work correctly, would be an active electronic device, that would be continualy averaging the voltage between the two, then sendig that data to the ECU. I like the idea that they did in that 33WRX, which is how im planing on doing it. but only running a single maf.

[Myxalplyx]

Just wanted to give a little update. I went to Verocious Motorsports (previously Vertex Industries) this past Tuesday (1-31-06) to talk about a custom intake for the SVX. I told them that I had two primary objectives for the intake. 1)To get rid of the 'accordian' flex of the stock hose that is between the maf sensor and the throttle bodies and, 2)To get rid of the stock air chamber before the throttle bodies for smooth piping going to both of them. Also, I want to get rid of the stock air filter assembly for a big cone filter that has an opening on the end of it. This cone filter will at first be placed in the engine bay for testing with the hood up, then a setup to put it in the fenderwell for cooler air later.

A guy there name Alex (who is one of the main guys there) and Tom went about taking all the measurments they need to get this started and we decided we would discuss this later. I opened up the piping possibilities to include aluminum, silicone or a combination of the two. Stainless steel is expensive.

We talked about duel piping coming off both throttle bodies as well as having a 'y' type connection (Like your header would be coming off the exhaust ports) to connect to one pipe and going from there. The biggest problem with dual piping is the space in between the throttle bodies and the firewall (like 5.75", maybe 6" if you remove the device that is on the firewall). It can be done but it would be a tight fit.

So I just left it at that and let them do their thing. I may call them tomorrow to see where things stand. It will be very interesting (I had to put this out as a just in case) if somehow this helps the top end level off instead of dropping like it does now. Of course it won't but it can't hurt just to see right.

Anyways, this is where things are for now.

[NikFu S.]

Having the maf in between the throttle bodies like that would be ineffective. It needs to measure the air coming in, before it gets sucked into the manifold.

[Myxalplyx]

Originally Posted by NikFu S.

Having the maf in between the throttle bodies like that would be ineffective. It needs to measure the air coming in, before it gets sucked into the manifold.

NikFuS, that is what it is doing. Unless I'm looking at that picture wrong.

[NikFu S.]

Originally Posted by Myxalplyx

NikFuS, that is what it is doing. Unless I'm looking at that picture wrong.

Didja see the last one there? That last picture?

[Myxalplyx]

Originally Posted by NikFu S.

Didja see the last one there? That last picture?

Yeah, it looks like two intake tubes going into the maf sensor. Then it looks like piping is being split into two pipes and going into the throttle body. I don't know it could be done or the benefits of it so........ I mean, there is less than 6" of space in front of those throttle bodies. The maf sensor attached to the throttle body would leave next to no space left for any piping.

[NikFu S.]

Gimme a couple minutes to draw somethin up.
--
Here we go.

linkthingy

[SilverSpear]

Nik you are right on this one, I can see the only way to setup such a thing is to go with 2 impreza tubes using one stock SVX MAF on each side and dividing the voltage between the two. We should ask LAN about this one, maybe a 2V6 in release???