Is there much benefit to changing the air filter box for a cone filter etc? I have read in the past that this can actually cause more problems than its worth.

If this is the case then i guess the next best option is to simply upgrade the exsisting panel filter itself. Ad's quote a 40% better air flow with certain makes - is this anywhere near true or again worthwhile?? if so can you let me know a good one!!

Thanks

 

depends what sort of power you are looking for. There is no point going for a cone filter unless you hit the limit of what a good panel filter can flow.

Fitting a cone filter can reduce power if you dont feed it with cold air.

 

Cheers John,

I am at the begining of a long road to mod'ing my 01 WRXppp so any ideas on good cost effective ways of doing so??

Cheers

 

BTTT

 

pippyrips,

Everyone has their opinions on air filters. I did an experiment on my Naturally Aspirated Car recently, and fitted an K&N pre-oiled unit onto the setup. THe filter was also sitting in the engine bay so it would theoretically suck up warm engine bay air.

Now the results were suprising, but bear in mind the results were entirely on the butt dyno. Ove the same hills, I could pull up in 4th where before, I would've needed to be on 3rd. Up high, the engine reves very happily, but below 2000 rpm, it seems to be underperforming.

I have a hypothesis on the behaviour

1. The K&N altered the air flow by passing the air flow sensor. The sensor causes the fuel mixture to be somewhat lean, and you can feel the differences using Higher RON fuels.

2. When idleing, heat re-enters from the engine bay into the AFM and launch is slightly less sprightly, but as soon as the vehicle moves, it suddenly launches hard.

3. At high speeds, there is an abundance of cold air circulating in the engine bay, and excellent flow dynamics means excellent power.

Now bearing in mind, all this is applicable to NA experiment.

Your Turbo would probably benefit from the same, except, warmer air is forced into your intercooler due to your turbo, so your intercooler is probably more of a factor to consider. Having said that, if your intake does not affect the airflow as much (such as the new APS units as an example) then you are probably at a slight advantage from stock.

Having said that, it is important you find a good filter, and a good engine management system. Last thing you want is to find your turbo filled with dirt and grime from a useless filter, or worst still, your AFM is misreading air flow and causing your motor to run way to lean, you don't want your pistons ending up in the firewall.

Well just some food for thought


[Edited by prana - 12/20/2003 10:48:03 AM]

 

cheers prana- was it a full on induction kit or just a panel replacement?

 

go for a itg panel filter you wont regret it

 

Cheers mate!

anyone know where i can get an itg panel filter from???

 

theres one in the for sale forum on page two now!!!!!!!!!!!

 

pippyribs, it was defntly a pod

 

thanks again guys

 

just fit a decent pannel filter and marvel @ how much money you will save over a few years by not replacing it so often

dont be amazed at all the extra power you will be getting because, you simply dont gain any real power on the road UNLESS your standerd filter is restricting the intake, i think the figure is about 300bhpish for a standerd sti filter?