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Old 11-04-2001, 12:40 AM   #1
Scooby Newbie
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Join Date: Nov 2001
Location: SF Bay Area
2000 Forester

Default K&N drop in replacement actually reduced HP on a Z3

check out this article written by the "ganz" of BMW Z3's. follow the link and check out his take on the air filter option #1:

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Old 11-04-2001, 03:56 AM   #2
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That hasnt been the case here

But our silencer removal mod is simular to what they are doing with that box
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Old 11-04-2001, 05:57 AM   #3
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i dunno...i understand what he's saying. But i put it in cause i needed a filter and it was there and it only cost me $20. But i do agree with their logic.

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Old 11-04-2001, 07:58 PM   #4
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'00 2.5RS Coupe, AW
'93 GMC Typhoon AWD


Hmm, interesting comments about the K&N drop in filter:

K&N filters do not filter as well as your stock paper filter. I will not put one on my car. Your filter is the first and only line of defense against letting dirt into your engine. The K&N is made from an oiled cotton gauze, if the oil dries out the 'filter' basically stops all filtering. I have heard it said that when a K&N filter gets wet the water can 'wash' the previously filtered dirt right through it and into your engine. The person who told me this raced motorcycles and said that when he switched from K&Ns back to paper filters his engines lasted much longer between rebuilds.
He has a good point.

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Old 11-04-2001, 10:38 PM   #5
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When ever using K&N products be sure that it is not over oiled when instaled. Its a simple thing to have happen and often right out of the box filters are saturated with oil. Beware its easy to understand that over oiling your air filter can cost more than horespower. Aside from that and a very old filter that has bugs and tire rubber matted in to it is unlikly that a K&N will rob horse power.
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Old 11-04-2001, 11:55 PM   #6
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your talking about contaminating the hot wire mass air sensor, I presume.

while I would not have expected the K&N OEM replacement filter to actually reduce power, I wouldn't expect it to gain HP over stock either unless the stock paper filter wasn't new. if anything, I'd expect a 0-1HP gain but the dyno run seems to prrove the opposite.

the test I quoted was based on two dyno runs on the same car, compring new K&N to new stock. if the K&N was over oiled in the package, I would expect that the excess oil would have been sucked off of the filter as soo as the engine speed was raised.
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Old 11-06-2001, 02:57 AM   #7
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I prefer to sell the AMSOIL filters, which I think flow better than a K&N. All my race bikes always used oiled foam filters for best power.

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