What gives better performance, panel filter or induction kit?
13 August 2007, 08:36 PM
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13 August 2007, 09:00 PM
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13 August 2007, 09:09 PM
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G
14 August 2007, 08:30 AM
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Harvey on here did some tests on a dyno using 4 different panel filters
In the order of best to worst for producing power...
HKS Green Pannel Sponge.
O/E Subaru item.
K+N pannel
STi panel
All filters were within 2bhp of each other.
Harvey pointed out that although the HKS gave the most power it was the worst for partial filtration capable of passing quite large grains of sand, now that will kill your MAF and your engine.!
I cant comment on an induction kit as the last time i seen one of those it was fitted to my cossie... that was a while back..lol
Rob
In the order of best to worst for producing power...
HKS Green Pannel Sponge.
O/E Subaru item.
K+N pannel
STi panel
All filters were within 2bhp of each other.
Harvey pointed out that although the HKS gave the most power it was the worst for partial filtration capable of passing quite large grains of sand, now that will kill your MAF and your engine.!
I cant comment on an induction kit as the last time i seen one of those it was fitted to my cossie... that was a while back..lol
Rob
And i't booked in with Mocom tomorrow for new plugs and a re-map.
I'll keep you posted
14 August 2007, 08:54 AM
#35
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14 August 2007, 10:59 AM
#36
When i bought my WRX it had a Greddy Airinx (old stlye) fitted.
acceleration was awesome and pickup was great.
i went back to standard airbox with k and n,acceleration was more sluggish and pickup wasnt as good,have now refitted the Greddy and seems better.
Its a big filter too, dry type also.
when i removed the old airbox,the wire mesh part of the MAF was filthy,surprising since i had a new k and n in the air box
Heres the Greddy,part of it anyway.
acceleration was awesome and pickup was great.
i went back to standard airbox with k and n,acceleration was more sluggish and pickup wasnt as good,have now refitted the Greddy and seems better.
Its a big filter too, dry type also.
when i removed the old airbox,the wire mesh part of the MAF was filthy,surprising since i had a new k and n in the air box
Heres the Greddy,part of it anyway.
14 August 2007, 09:32 PM
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You were locked up years ago.
14 August 2007, 09:59 PM
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are you nuts 
Harvey pointed out that although the HKS gave the most power it was the worst for partial filtration capable of passing quite large grains of sand, now that will kill your MAF and your engine.!
14 August 2007, 10:35 PM
#42
well,i`ll let you know how good from new this greddy airinx is,this is it when it has done its job and time to replace........
*engine is ALOT cleaner/ polished up now*
*engine is ALOT cleaner/ polished up now*
15 August 2007, 04:16 PM
#43
As reference has been made to some testing I did previously, please let me clarify.
Four pannel filters were tried.
The "best" performer in terms of power on two separate days was the HKS Green pannel.
Next O/E Subaru disposable.
Next was the K+N followed by the STi (disposable)
The difference was only 2bhp.
Prodrive (Mike Wood) confirmed my results were roughly in line with their findings.
The tests were done on a car with O/E ECU without any form of remapping which would not have been possible anyway and the chances of mapping making any difference for 2 bhp different air flow are extremely remote.
At the same time I also found that removing the inner wing resonator on its own resulted in a decrease in power by, (from memory) 5 bhp.
Tests were done one afternoon within 45 mins and as results were not as expected, repeated the following day with similar results.
Subsequently I investigated the filtering abilities of each filter as best as I could.
Clearly the HKS Green Pannel could pass quite large grains of sand.
There was no appreciable difference between the other three although I think the STi is probably best at filtering down to a small micron particle size.
On a car I am keeping, I would settle on a K+N as it is reusable and if the sales blurb is to be believed it has good service life. Otherwise I would use the O/E Subaru filter.
When the engine was rebuilt on the test car, I know the turbo compressor wheel was unmarked. That turbo was removed over last week-end and the edges of the compressor blades are finely peened and nicked. I will try and post a photo. I had not changed the HKS Green pannel but obviously now wish that I had done. Another lesson learned.
The car now has a replacement turbo and a K+N pannel on order from RCMS with a mapping session on the rollers with Steve Simpson this Friday.
At a later stage I will try a bigger turbo but while below 350 bhp I will stick with the pannel and O/E induction air box (without a MAF Sensor on the Simtek ECU) I may try an experiment, pannel/cone, especially above 350 bhp.
Four pannel filters were tried.
The "best" performer in terms of power on two separate days was the HKS Green pannel.
Next O/E Subaru disposable.
Next was the K+N followed by the STi (disposable)
The difference was only 2bhp.
Prodrive (Mike Wood) confirmed my results were roughly in line with their findings.
The tests were done on a car with O/E ECU without any form of remapping which would not have been possible anyway and the chances of mapping making any difference for 2 bhp different air flow are extremely remote.
At the same time I also found that removing the inner wing resonator on its own resulted in a decrease in power by, (from memory) 5 bhp.
Tests were done one afternoon within 45 mins and as results were not as expected, repeated the following day with similar results.
Subsequently I investigated the filtering abilities of each filter as best as I could.
Clearly the HKS Green Pannel could pass quite large grains of sand.
There was no appreciable difference between the other three although I think the STi is probably best at filtering down to a small micron particle size.
On a car I am keeping, I would settle on a K+N as it is reusable and if the sales blurb is to be believed it has good service life. Otherwise I would use the O/E Subaru filter.
When the engine was rebuilt on the test car, I know the turbo compressor wheel was unmarked. That turbo was removed over last week-end and the edges of the compressor blades are finely peened and nicked. I will try and post a photo. I had not changed the HKS Green pannel but obviously now wish that I had done. Another lesson learned.
The car now has a replacement turbo and a K+N pannel on order from RCMS with a mapping session on the rollers with Steve Simpson this Friday.
At a later stage I will try a bigger turbo but while below 350 bhp I will stick with the pannel and O/E induction air box (without a MAF Sensor on the Simtek ECU) I may try an experiment, pannel/cone, especially above 350 bhp.
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