PG03WRX

ls it worth changing the standard pannel filter to a KnN or similar,can you feel any difference on a 03 wrx

Optical Race

I have recently changed to a GreenCotton panel filter, feel bit better tbh btw MY00 Impreza Turbo.

g7prs

iTrader: (5)

Another thumbs up for the green cotton panel filter

rob84

iTrader: (5)

k&n in my04sti

Multijfj

go for it, only like £30 and you do get results, see the newage modding etc. at top of this forum, and its proven!

lisa300

Iv just fitted a green cotton pannel filter to my 03 sti, tbh havnt noticed any performance gains but i suppose their must be a small amout of gain.I feel better knowing i have a quality filter breathing clean air.Oh and its the first mod iv fitted myself

Alan MaC

No doubt about it mine goes much quicker. If you use search on hee, about 12 months ago SNetters tried them on a rollong road. Some had BHP gains of 10-15 BHP.

Well worth it.


Alan MaC

PG03WRX

cheers for the info is green cotton the way forward?

Alan MaC

Does a Bear go for a Woopsie in the Woods?

nik52wrx

Is this the jobby.....
Induction Kits and Panel Filters:Induction Kits and Panel Filters: Blitz Iridium Spark Plugs [BLITZIRIDIUM] - £64.99

Its what i'm about to order. If not what is the one to have
Nik.

Alan MaC

Panel Filter, Iridium Plugs great.

If you are going for serious power (over 300 bhp) then have the Induction Kit, if not, IMO the first 2, will give you a big rin.

Alan MaC

acko

yes nik the first one that you see on the list is the one to have, but it wont give 10 - 15 bhp more

Elmer Fudpucker

The std filter is just as good as any

nik52wrx

I plan on keeping my car for a few years so doesn't an after market filter make sense as i wont need to replace it every year.
Save a few pence
Nik.

Elmer Fudpucker

I'm not knocking aftermarket filters,I have a K+N myself.

just remarking that theres no performance advantage in it....unless you have the STi branded filter which makes it worse

Alan MaC

What about the SN people who tested them on the rolling roads last year & got more BHP with different filters?

Elmer Fudpucker

I think it was Harvey(?) that did some tests.

On a bunch of filters that he tried,I think the difference between the best and worst was 2bhp.The k+n was the best,the STi the worst...then of course theres the filtration properties to bear in mind

rabskyline

mate got his power fc at andy f's and he said remove the induction kit and fit green cotton panel filter. and if andy says it then its green cotton for me too ! cant go wrong with that guy !

daniel lawden

iv heard after 99 the air filter sensor were 2 sencitive for cotton filters

Alan MaC

Elmer think your right about Harvey.

Did I dream this? didn't someone do a rolling road thing and found up to 5 BHP difference however, wasn't there something to do with the temprature??
As in hot day???

I still think the Sports Panel Filter is much sharper than the standards paper one.

Yourself??

Elmer Fudpucker

Nope,no noticeable difference at all

Harvey and Mike Wood add their opinion in this thread

https://www.scoobynet.com/general-te...ey+air+filters

SirFozzalot

Some interesting info in that thread.

That's quite surprising, I have heard people rave about the improvement they get from removing this.

Interesting that the results are also endorsed by Mike Wood.

Personally I have had an STi filter and currently have a Green cotton one, have to say that I can't really tell the difference between any of them

Alan MaC

Elmer, Got it! Tony Burns got a 12-15 bhp increase in his post .

I knew that I'd seen these numbers somewhere in that thread.
What do you think about these claims??

TonyBurns

iTrader: (3)

Yep I got good gains from an STi panel filter
The car did 2 runs prior to fitting, ran about 288bhp both times and 298lbs of torque, virtually no variation on the first 2 runs.
The filter was changed with the car still running on the rolling road, so a bit of heat soak the next 2 runs.... 299bhp and 300bhp, torque was 310lbs first run, 312lbs 2nd run (there were some . somethings in there) but it equated to 12bhp and 15lbs of torque increase, the engine was also more noticably freer running above 6.5k (8k red line) where as it felt strangled with the standard filter in, it ran much better beyond this after the change (plus a nice change in tune )
This test was done on a LADS rolling road day, lots of witnesses and the run was done at Prosport in Stockport
(car had about 1700 miles on the clock btw )

Tony

Elmer Fudpucker

In that case Harvey and Prodrive must have confused their results,I unreservedly apologise for wasting your time....15bhp from a panel filter

TonyBurns

iTrader: (3)

Yep, considering my car is standard apart from said panel filter, book quoted power figures for this car (JDM MY03 STI for which this filter was designed for) is 276bhp, it is in fact running 318bhp, JDM map, 99 ron fuel and octane booster, most of these cars wont get above 300bhp on just 99 ron fuel and octane booster on the JDM map, and this was done in front of 25-30 people.
I reported these finding back in 2004 when the car ran it originally, though if you want to test it out, go get a JDM STI (original fuel map) and test it.
The gains were not just 1 or 2 bhp, but 10-12bhp, rather considerable considering the car had been sitting running on a rolling road for 3-4 mins whilst the original filter was changed out.
It was also noticable on the road that the car was more free revving towards the top end of the rev range after changing the filter out also.

Tony

Alan MaC

I was only trying to reassure myself that I had not imagined reading this somewhere.

You were not wasting my time for sure, I think the whole point of this SN thing is to get mixed views.

To me, we certainly have that.

I see you have a K & N Panel Filter yourself, what do you think of it V's Paper one and, if Mr Paper is the same, why the K&N?

Elmer Fudpucker

The highly sensitive 'Elmer buttometer',tells me that aftermarket Filters have no performance gains at all over the std item.

I'm not a tech-head,I fix ships for a living..so don't shoot the messenger please

edit: English is my first language,but I still struggle with it!

davedipster

I'm running 300hp and changing to a green filter just made more noise, no extra power at all. Been using the std subaru filter ever since, and at £12 it's cheap. Also I was worried about the filtration issues of these aftermarket filters, some are rather bad.

dipster

Elmer Fudpucker

Thing is tho Tony with you making claims of such gains,every Orangotang-minus that reads that will be breaking their neck to buy one now