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Discussion Starter · #1 ·
I realize this isn't R35 specific, but rather just a general question. But I'm wondering what the benefit of the cone filter over the standard box filter is in our cars.

Basically - I don't want to deal with oiling my filters, cleaning them, etc... but I do want the benefit of increased diameter tubes and better MAF (like the Cobb SF intake, or Gotboost intake, etc...).

Would something like this work? Or would it diminish the point of the intake?
 

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I think the benefit of the r35 cone filter is that it can be put in the bumper area for more air. I would assume you can do the same with a filter box by cutting a hole in the bumper like the nismo and stillen cars have for more direct air to the filter box. And or fit a plastic pipe to the filter box and extend it out like a cone filter would... Dunno how that would work cause no filters at the end so experimentation may be needed.

Also because there is a box and not a strait pipe it may also be a limiting factor. Seems to work for the fia gt3 gtr and nismo race cars from what I hear they still use the filter box.

Iirc BMC have a nice box filter if your looking.
 

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I realize this isn't R35 specific, but rather just a general question. But I'm wondering what the benefit of the cone filter over the standard box filter is in our cars.
Nothing in most instances. Some point towards greater cross sectional area of the cone filter element. Others point towards cone style cotton filters having very little in the way of actual air filtration. FIlter oil is the very last thing you want to get on your MAF element.
 

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Discussion Starter · #4 ·
Nothing in most instances. Some point towards greater cross sectional area of the cone filter element. Others point towards cone style cotton filters having very little in the way of actual air filtration. FIlter oil is the very last thing you want to get on your MAF element.
This is exactly why I don't want to deal with it anymore. Such a simple, low cost item, and its application - such as filter oil - can ruin a lot of things. Obviously, the ECU would detect something is wrong, and possibly correct things on its own (and throw a CEL), but I'd rather just stick with the stock style airbox, run larger piping, and use the aftermarket MAF sensor.
 

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The only thing would be the size of the filter area. If the cone has a larger surface area it can trap more dirt, it can flow more air.

A cone is more popular, because its easy to work with.
 

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Although not directly related to cone filters, I was under the impression that most people opted for cone filters as a direct result of upgrading to larger diameter intakes to allow the MAF's to be rescaled owing to the problems of running higher flowrates on the stock boxes. I am running 3" intakes and have placed outerwares on the cones to improve filtration, I've also opted to just buy new filter instead of cleaning and re-oiling them each time, the cost isn't too high and IMHO many of the oil problems come from excessive re-oiling and not from the oem supplier, in terms of filtration it's a given that the cotton filters are not as efficient as the paper OEM ones particularly when initially installed until they become loaded, however what effect this has on engine life is not really known, as it's widely debated if the particle size that cotton filters allow to pass is significantly large enough to cause wear over a typical lifetime.
 

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Thanks for that info! Now I don't feel like I'm on the wrong path.

This is exactly why I don't want to deal with it anymore. Such a simple, low cost item, and its application - such as filter oil - can ruin a lot of things. Obviously, the ECU would detect something is wrong, and possibly correct things on its own (and throw a CEL), but I'd rather just stick with the stock style airbox, run larger piping, and use the aftermarket MAF sensor.
i never re oil my K&Ns i dont trust my self to do it right so i just buy new ones if it ever needs is
 

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Discussion Starter · #8 ·
i never re oil my K&Ns i dont trust my self to do it right so i just buy new ones if it ever needs is
Exactly. But you have the inexpensive drop-ins, right? That is what I'm looking.for - 3" intake with the stock airbox, so I can just repurchase additional drop-ins.
 
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