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My car came with one when I bought it. They are loud from intake resonance. It took me about six months to find a complete filter box and put mine back stock.... Stock is a PITA to change the filter... but not much more than trying to change the cone, wash it, oil it, and reinstall it. $.02
1) Cone filters work better on engines using an airflow meter such as a 3.2 Carrera or 964.
2) Cone filters affect drivability & power on engines using a MAFS due to introduced turbulence and non-laminar airflow.
3) Oiled gauze cone filters (all) do not filter as well as the factory paper panel filter and this shows up in UOA's as well as in the engine. For race cars, this is not a big concern due to the limited mileage between rebuilds, however this should be considered for street cars.
4) We see more power with a factory airbox using a cutaway frame (or properly drilled cover) to hold the filter element compared to clamping on a cone filter right onto the MAFS.
What about intake length and path Steve? Have you done any dyno testing on these?
As in there are two main styles of cone filter, the ones that attach directly to the AFM and the ones with the longer inlet and generally a 90 degree bend?
And speaking of MAFs, do you recommend this conversion? I feel like it used to be all the rage years ago but you don't hear much about it these days. Would love to hear your thoughts Steve. Thanks!
And can you explain the cut away frame vs drilled. Is the frame similar to what you find on the 993 motorsound? Can it be purchased?
Do all cone filters have to be oiled? That's were the problem starts...
Companies like AEM sell cone filters that do not need oil. They are designed to be dry elements.
Regardless, unlike MAF cars (e.g. 993, like picture in original post) I don't think AFM cars (i.e. flapper box air flow meter) are affected by oiled filters.
I installed a Uni Foam filter, it needs to be oiled and cleaned every so often. But I liked it and it cost me $9+11 shipping. It replaced some Spectre cone filter that was rusting and nasty. Uni is big in the quads and motorcycle scene. I personally like the foam filters better than cotton gauze. Much easier to clean and re oil, and it weighs much less than the Cone filter.
Our cars are AFM and the oil doesn't mess with anything, since our oil breather is already piped into the intake.
I didn't purchase the elbow, it came with the car when I purchased it, but the red clamp says spectre on it. I left that and just added that foam filter. Their website might have piping available
What about intake length and path Steve? Have you done any dyno testing on these?
Yes,...quite a bit. Intake length between the AFM and air cleaner isn't critical, however diameter, & turn radius is. If I use a cone-type filter, I prefer to locate that closer to the decklid grille to admit cooler air.
As in there are two main styles of cone filter, the ones that attach directly to the AFM and the ones with the longer inlet and generally a 90 degree bend?
There are different brands, but they are all very close in design to each other. The rest of the differences lie with the hardware supplied by each vendor.
I've added a cone to mine quite recently, I know there isn't supposed to be any power increase, I'm fine with that...
I mainly did it for aesthetic reasons, but I'm happy to report that there's a lovely induction roar and the car seems to pick up and go better, probably just me being fooled by the increased noise!
Originally Posted by Steve Weiner-Rennsport Systems
Yes,...quite a bit. Intake length between the AFM and air cleaner isn't critical, however diameter, & turn radius is. If I use a cone-type filter, I prefer to locate that closer to the decklid grille to admit cooler air.
There are different brands, but they are all very close in design to each other. The rest of the differences lie with the hardware supplied by each vendor.
I installed a Uni Foam filter, it needs to be oiled and cleaned every so often. But I liked it and it cost me $9+11 shipping. It replaced some Spectre cone filter that was rusting and nasty. Uni is big in the quads and motorcycle scene. I personally like the foam filters better than cotton gauze. Much easier to clean and re oil, and it weighs much less than the Cone filter.
Our cars are AFM and the oil doesn't mess with anything, since our oil breather is already piped into the intake.
05-15-2015, 02:50 PM
Cone sytle filter vs Airbox
