skabaru

I am looking for a cone filter, but ignore the argument of the intake in the 1.8T blah blah blah. That is not the question here.

I am looking at a cone filter, and I am debating between the K&N and the ITG foam...

the K&N seems like a safer bet, but I would like REAL data, or atleast a biased writeup?

anyone got a link?

scott12v@pghaudi

<center><img src="http://www.audi12v.com/mods/engine/images/intake2/ramiv_2157a.jpg"></center><p>See how this cone has a gentle curve to it? Helps to smooth out airflow. Most (although not all) of the K&amp;N filters have very some very sharp edges that will disrupt the airflow.<ul><li><a href="http://www.racingsportsakimoto.com/prod_fr4details.php">http://www.racingsportsakimoto.com/prod_fr4details.php</a</li></ul>

xr4tic

but that's pure speculation on my part.

But like Scott said, an integrated Velocity stack would be good.

skabaru

but I was also thinking someone has to have looked at this... I just haven't found the link yet...

the integrated velocity stack.... I like the idea, but the akimoto ones seems CHEAP and image over performance to me... I also can't imagine it will make a HUGE difference on the the FI cars... but I am certainly looking at them...

xr4tic

In my application, I've got the MAF next to the TB, so it's a long way from the filter, but if you're going to have the filter next to the MAF, it would probably make a big difference, as the MAF can be very sensitive to turbulence.

scott12v@pghaudi

I've had both a K&amp;N and Green cones, and they don't come close to the construction on the akimoto.

The site is flashy and annoying, but the product is of great quality. There are also some other velocity stack cones out there if you aren't convinced about the Akimoto.

As xr4tic said, its all about the air flow that passes the MAF. A lot of us on the 12V forum have removed our MAF screens...to do this, you MUST have some sort of velocity stack to smooth the airflow...either in the cone, or added to the airbox. If the MAF screen is removed on the 12V, running without a velocity stack will result in a code being thrown.

scott12v@pghaudi

A lot of what they offer is subscription based, but some is free. You should be able to find something on that site. Here is a tidbit that I grabbed from Autospeed...check out the part about Low Flow Restriction. It talks about material selection:

"Big Breaths
A new intake system can improve power and responsiveness in two ways. Firstly, any pressure drop (ie restriction) on the intake to the turbo will make a dramatic change to the power developed. Go up by one psi on exhaust back-pressure and the difference will be marginal, but drop by one psi on intake pressure and the power plummets. So any restriction at all on the intake should be avoided. Secondly, and just as importantly for a turbo car like the Rex, the intake air should be kept as cool as possible. This is so for two reasons - there's more oxygen in colder air (ie it is denser) and this allows the development of more power, and colder intake air reduces the likelihood of detonation, allowing the ECU to run more advanced timing - again aiding power.

When selecting a new intake system, here are some factors to look for:

Cold Air
The intake system should be totally sealed from the underbonnet area, so that all air that is breathed (even when the car is stationary) comes directly from the atmosphere without any pre-heating.

Low Flow Restriction
Most airfilter media - foam, oiled cotton, paper - flow very well. It's usually the way that the air is directed into the filter and then channelled out of the filter that causes the most flow restriction. So look for sweet and gentle curves either side of the filter, rather than getting too excited by the filter itself.

Excellent Filtering
The best flow of all will come if you get rid of the element and replace it with chicken wire! You don't do that because you want good filtering - in fact good filtering must be a high priority. Unfortunately almost no aftermarket manufacturers release filtration effectiveness information, so be conservative in this regard. If the manufacturer claims that their filter element has half (or a quarter, etc) of the restriction of the standard element, you need to consider whether the filtering effectiveness is also half..."


BTW, I've found Autospeed to be an invaluable resource for questions like this. The subscription price isn't too much (its in Australian dollars) and IMO, is well worth it.<ul><li><a href="http://www.autospeed.com/cms/A_0838/article.html">Here is a link to the full article (about the WRX), I'm not sure if you need to be a subscriber to see it.</a></li></ul>

skabaru

I assumed it was cheap honda crap, due in part to its site and the fact that it only comes in purple, yellow, etc... but if the quality seems to be there in your experience, I will take them into consideration. Thanks!

skabaru

There will be 1 ~45degree bend between the filter and the MAF housing, and I was intending to remove the screen but add a little something to smooth the flow a bit before the MAF.

The MAF should be about... ~1 foot to 18inches from the filter... in a section of straight pipe (this of course is the plan, and with it being a bit cold in chicago to play right now, I am planning and mapping it out now, to be built in the spring...)

skabaru

their article on pressure zones in the intake tract was great too. I did miss this one though, thanks for the link!