944 NA Stock air box with uprated panel filter or new cone filter?

[scottstanley944]

Hi Guys,

Im after some advice on air intake.

On a 944 NA which perfoms the best?

standard air box wirth uprated panel filter? or a new cone filter?

Was thinking as the standard air box sucks cold air up from under the passenger side wing this would work better, as a cone filter would suck its air from around the engine which would be warm.

what do ya reckon? :help:

[flash968]

which setup works best is basically a function of 3 things:

1. filter size - the square inches of surface area are critical

2. air flow - how the air enters and exits, and whether or not it has to go around any bends or sharp corners, as well as the flow characteristics of the filter itself are factors - a bell mouth exit from the filter will flow better than a square edge exit - straight tubes have less resistance than bent ones

3. location - obviously you want to reduce the intake temperatures as much as possible - every 15 degrees you drop is good for about 2 hp - as an example of how much of a difference this can make, an air pickup point in front of an oil cooler (like in the 968) is about 30 degrees hotter than one behind the center grill area - that's 4 free hp on a 3 liter engine

you can use a manometer to test the flow characteristics and see which one is best - you can also use thermometers to see where it is best to place the unit

as a design note, airboxes do a nice job of isolating the intake and preventing heat from entering the intake - however they are often limited in filter size - increased noise is often an unfortunate result of changing intake setup too - this is another reason that airboxes are used - germany has the strictest sound standards of any country, and consequently have some of the most restrictive intakes and exhausts

Edited July 5, 2009 by flash968