As above really,

would really like to get a nice cone filter on my 02 sti but ive heard horror stories that induction kits allow dirt to ingress and it knackers the rather expensive MAF sensor.

Do i just buy a pannel filter?

Drill the airbox?

Leave it alone?

Can someone put me straight

cheers

 

afaik, no point doing it except for the increase in induction noise.

I just went for a higher quality / longlife 'performance' panel filter.
Not worth the risk i reckon, unless you are planning more mods that require greater airflow etc...

chris

 

so its true then?

 

There are some induction kits out there that will let more cr@p through which could possibly damage the maf. There are people who say it will and there are people who will say it wont. I personally have a blitz induction kit, which probably isnt the best for filtration but touch wood I havent had any MAF Issues. What I would say is if you do fit an induction kit, then make sure it is as secure as possible so that it doesnt disturb the maf to much.
Also with an induction kit you are more likely to take in warm air from the engine, to help combat this you can remove a rubber strip from the bonnet on the offside which will let more cold air in (air will flow between top of headlamp and under bonnet). Other people have built shielding to stop the warm air.

You do get an obvious increase in induction noise, and also when you lift off the throttle (for gear changes) you get a sort of weak VTA dump valve noise.

 

Talk of weak MAFs refers to MY99/00 specifically.

You shouldn't have any problems on yours. Just make sure you get a decent filter (K&N for example) which filters well.

I dont know how much your OE ECU (without a re-map) will be able to compensate for the extra airflow so it may be worth checking with someone that knows about your MY.


Bob

 

okay cheers lads

 

No, MAFs kill MAFs .... sorry just had to say that ...

on a more serious note, from what I read isnt it more about the straightness of the air so that the MAF can get a correct reading ... as long as the pipe before the MAF is straight for a certain length then it should be fine bar any dirt getting in ....

Is this right?

 

As already said you need a quality air filter and I know from experience that K+N fit that criterion.
If the air flows through a sharp bend eg 90 degrees as on a cold air kit, immediately before the MAF sensor, then obviously the air on the outside has to travel far faster than the air on the inside of the bend. This can result in the MAF under reading the volume of air and lead to under fueling which has cost a number of people an engine.
Re-mapping or calibrating the MAF sensor signal can compensate for this.

 

Okay so sounds like im just better off with a pannel filter,

which one is best recomended?

 

I'm going for the green cotton panel filter that TSL sell http://www.tsl-motorsport.co.uk/news...0007&detail=63

 

....or http://www.scoobyworld.co.uk/catalog...roducts_id=106

 

STI panel filter mate, that should do the trick

 

I've just bought a green panel filter from eBay, £42.49 inc. VAT and P&P. There are more available http://cgi.ebay.co.uk/SUBARU-IMPREZA...QQcmdZViewItem