After about two years of thinking about making my own and dreaming up the design I have finished my custom intake. Details are on my site. Question comments are welcome. If you have a problem viewing my site there is a non-frames link at the bottom of the page.

 

NICE!!! Are they at all restrictive? Wouldn't really think so... Just curious.

 

Wow, that looks... very odd Pretty cool though.

 

I measured the filter element size and each filter is about 3/4 of the stock filter area. They are simular in size to other filters used. In fact I think the K&N is the same size as the ones used in the M2 box but I'm not sure.

 

The smaller filter does look like its about the same size as the M2 (rxfashion in my case).

 

you should really thing about routing your pipes down to where your overflow tank is located to get some colder air, right now yoru sucking up fairly hot air which is right in back of your radiator.

 

looks interesting. good job on trying something new. have your intake temps lowered at all? what boost levels are you running? have you considered ceramic coating the intake covers and pipes? the set-up does look kind of restrictive, but looks can be decieving .

 

Looks nice, but why the metal covers around the filters? I read most of the page, but I must be missing something. Is there ducting that comes out of the bottomg of them that we can't see?

 

Incorrect... Read what I wrote and you will see that the air is being drawn from under the car for the primary turbo and from the front for the secondary. It is 100% cold air. I wouldn't spend so long to make a design that sucks air after it passes through the radiator.

 

Thanks, I do plan on painting the shielding and pipes with ceramic paint. I don't want to spend the $$$ for real ceramic coating. And don't worry, its not restrictive. Everything is calculated such that all air passages are at least 4.9 square inches, which is the area of the 2.5" pipes.

I'm running a little over 10 psi of boost with about 300 at the wheels.

 

Read 7 and 8 under construction. It explains the concept behind the heat shields with a picture of one of them removed. Here is a direct link to that picture.

http://www.silverbulletrx7.com/Intake/Duct.jpg

 

I think it's great when someone takes the time to create something new, and original. It's obvious that you spent a lot of time on this.

After looking at what you have done, I like the idea, but it looks restrictive when compared to the M2, or my Cheap Bastard intake mod: https://www.rx7club.com/forum/showth...hreadid=121491

It just looks like the openings to the filters are not very big. It certainly looks like a good improvement over the very restritive stock intake, but doesn't appear to allow as much airflow as the two mentioned above.

Even if it it is more restrictve, I applaud your effort, and design. Good job!!

 

Thanks,

Yea, I saw your mod. Nice and simple and anyone can do it, which makes it great. However I didn't want to use the stock box because it restricts air flow from the radiator up through the engine bay. Basically I decided that the air that passes through the radiator then hits a wall with the battery box, intercooler ducting and air box. When my fans came on I noticed a lot of air "trying" to pass between these things. Thus I created this intake and modified my battery tray to allow some air to flow up from there as well. As for restrictive, each inlet is just about as big as the stock inlet for both turbos and is at least as free flowing as the pipes they feed.

 

I get it. Looks really good then. Nice job

 

I'd have to agree with Adam on this one. I applaud your effort, ingenuity, and work involved, but I have some questions on the design.

It appears that the clearance of the "cylinders" around the air filters is fairly tight (judging by the photos). How much clearance is there? While it's important that you kept the intake area the same as the intake pipe diameter, it's equally important to have enough clearance around the filters so that air will be able to freely flow in through as much surface area on the element as possible.

I also noticed that you mentioned that it's possible intakes such as the M2/RX7Fashion airboxes can draw hot underhood air through the radiator (in reverse) at idle. Actually, I'm not so sure that's much of a concern. Once in motion, the airflow into the radiator nacelle (which the airboxes draw from) should handle any airflow needs.

I still don't like the idea of robbing any airflow whatsoever from the IC (even though you've reduced it to only one turbo). But's that's just my opinion.

Nonetheless, a good job!

 

I did take in to consideration the area around the filters as well. Each has more than enough area within the cylinders for proper air flow without restriction. (I used that thing called Math.) I don't remember the exact measurements but I didn't eye ball it if you know what I mean.

As for the other boxes yes, once moving it is not really a concern but the point stands when you are not moving.

I agree with robbing air from the intercooler and I did consider it but I wanted to keep the two completely separate and this was the easiest way. I wanted to do this because I was thinking one might cause a low pressure zone for the other depending on how the two filters are organized within a single box. I also wanted to do something different and this is what I came up with

 

It looks nice but it takes up alot of real estate in the car compartment.


If you're ever going to upgrade to a larger intercooler, you're going to have to modify it somehow.
I went with the rotary extreme box as I didn't like CF (too brittle) and allows me to use the M2 large IC.

 

Yea, I know. This does restrict my options for larger intercoolers but I'm happy with what I have right now.