OK I have been trying to find a solid cold air box for my car but haven't had any luck and have always wanted to try this design. I want to order an ITG filter and cover to fit to a 3" intake pipe which then connects to an intake duct.





Don't mind the rest of the intake in that picture as it is for a golf r. I will be connecting the duct to the filter housing with silicone couplers. This will for sure give me cold air but I'm concerned it might not flow properly. Also i'm switching to speed density so building this into a pipe wouldn't be that hard.

 

Which ITG filter have you decided on specifically? I ran an ITG for a couple years on my O.S. Green and it didn't flow as well as I had hoped. I found it to be rather restrictive. Just my $00.02.

 

Also, what turbo are you gonna be running? You probably should go to a 4" I.D. all the way from the duct inlet on through to the filter outlet, and on into the intake pipe right up to the reducer right before the compressor housing.

For a IX comp cover you should run either the FP ported shroud housing, or for the BBK run CBRD's ported cover. I mention 4" because you are going to SD anyway. So, why restrict yourself to 3" diameter? The point is to move more air isn't it? Not just to look techno.

 

Thanks sparky I was thinking about getting fp's antisurge cover. I might talk to chad and see if he will sell his cover since it's $50 cheaper and looks to be a nicer piece. I am running a stock IX turbo but I haven't decided what filter I am going to choose from ITG. My friend wont shut up about it and says it's the best. I am currently running an amsoil filter on stock maf and would like another one for SD but figured I would try the ITG to see what the rave is about. It is pretty pricey and if you are saying it isn't worth it then I might back off on that filter. That aside though I am wondering if the headlight duct would restrict my flow.

 

I used to order my ITG filters made to my spec from a place in Newport Beach, or Costa Mesa, CA(?). They were pricey. Which is OK. But, they just didn't flow that well. I would say stick with AMSOIL, or otherwise do a Perrin.

If you search online you will find the ITG charts. Study the chart and you will realize that to support 350-400 WHP ITG recommends a pretty huge filter. The smaller, more ergonomic one's just won't flow enough air to support the power of a turbocharged car. They are best for normally aspirated applications. The front face of the filter has a metal shield to support the foam element and keep it from collapsing. This metal shield has air holes in its surface but still it is restrictive. Look at it and tell me what you think. I think that your friend doesn't know what he is talking about.

 

To support 400 WHP you would need at least the ITG JC 60/86, which is a pretty huge filter. It is cylindrical in shape and about 7" in diameter, and about 9" long. This would only be minimally adequate to support 400WHP. It is probably borderline restrictive and you would actually need a larger ITG cylindrical filter to allow some headroom. The conical shaped ITG filters are 10% more restrictive than their cylindrical shaped offerings.

As I said, internally they have a restrictive construction which features a metal plate under the front diameter, or leading surface of the filter. They have to place this restriction under the foam otherwise it would collapse. I can go on, and on about ITG filters.

Incidentally, now that I remember I got my ITG filter to collapse with my OS Green. The design is just not well suited to turbocharged applications.

 

Ok you have convinced me to stay away from ITG. Funny thing though as the Golf R guys are running filters similar in size to our cone filters and making around 370-380 awhp........so they claim. I just want to find a good carbon fiber intake housing and then fit it with an amsoil filter. The headlight duct looks about 2.5" so I would obviously need to adapt it to the housing but is it too restrictive or will I be good to start ordering parts?

 

Your VW buddies are probably going to rag on you if you don't get the same filter that they all use. But you don't give squat, do you?

The West Coast distributor for ITG is Coast Fabrication, Inc., in Costa Mesa. If you go on Coast's website and click the "products" tab they have a section on ITG. In that section are the application charts for their filters. Study the chart for the ITG "Maxogen" filter product line. In the chart they relate BHP to filter size. It is an interesting read and you will then know more than your VW buddies do.

 

Just one buddy who used to have an ITG filter on his A3 and now is looking at one for his Brand new Golf R. It's a nice little car. He's about to drop $800 on an intake. Everything on that car is beyond expensive. A little off topic their I know. I didn't know about ITG up until a few hours ago so it looks like they just don't fit the bill on my car. FYI I'm making 427awhp. With a cop kit, anti-surge cover, and SD I'm looking to hit 435awhp.

 

I am currently running a Speed Element OMG filter. I don't think that it is as good as the Perrin or the AMSOIL, but it ain't too bad.

Well what I want to tell you is that previous to switching to the OMG filter, I had been running the ITG filter. As soon as I switched to the OMG filter we had to retune the car as it went way lean on me just from the filter change. We had to add a ton of fuel to the fuel tables. This should tell you something.

In fact, if you discover that the Perrin or the AMSOIL filters are too large for the confines of your cold air box, then I can recommend the OMG filter as it is a bit more compact than the other two filters and flows gobs better than my old ITG. Check it out.

 

Can anyone answer if the front duct can take in enough airflow for the turbo if the system was completely closed off from the engine bay?

 

damn normally everyone's got an opinion and I hear nothing but crickets

 

I would say your best bet is to build some sort of ducting from the lower left grill to the filter (if you can find the room) That way you have no extra restriction on the intake + more cold air. You could even build a box around the filter to keep it separate. Some other people do this and I think they see gains out of it (theres some threads on here somewhere), regardless its a great idea if you can figure out how to do it + have the ability. Also if done right it looks good.

 

I have done a box out of cardboard and saw gains. But since my car has ACD it doesn't leave a lot of room for a filter that way. This is definitely doable. My only concern is will this be a restriction?

 

In the near future, I plan on making an airbox out of aluminum with a 4" or so round inlet to clamp dryer ducting running from the drivers side grill up through the hole where the water sprayer reservoir was. That way it'll pull in only cold air and I'll replace my OMG filter with a large Green Filter. Might be overkill but I like projects like that and it'll be fairly cheap.