Date: Mon, 20 Aug 2001 12:05:11 -0700 From: Johannes H Andersen <johannes.andersennopsamel.ac.uk> Subject: Re: Sport Air Filter
Bob wrote: > > On Thu, 16 Aug 2001 14:34:40 -0700, Johannes H Andersen > <johannes.andersennopsamel.ac.uk> wrote: > > >It there really any point in using an air filter with supposedly less > >flow resistance in a turbo? > > Yes. The turbo can only supply air as fast as it can get it in through > the intake. The stock filter and airbox in a this car will restrict > airflow, increasing spool up time. There is also a HP gain at WOT, > but since most of us don't drive like that, the spool up is more > important. (Little of this applies to NA engines as they just don't > need the kind of air a turbo needs). > So the 'sports filter' has less resistance to the air flow, this we know already. But we haven't got an answer to the question about the effectiveness of such a filter in filtering out airborne dust. > There are other mods you can make > for short money to increase airflow, try www.saabnet.com, NG900 BBS, > search for 'air box', 'silencer', and 'transition casting'. A K&N > is a good idea on NG900SE, but the other mods are also recommended. > K&N's filter as well as stock, they just provide more air flow. Why > doesn't the factory use them ? Cost. > I can hardly believe that cost is a problem. A car such as 9-5 has ventilated front seats by electric motors, refrigerated locker in the dashboard among other (silly) things. If the sports filter was such a good thing, then you would expect it to be fitted as standard to many expensive high-performance cars. Is this really the case, examples? Johannes
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