Quote:
Originally Posted by Fast_Freddy
http://www.ft86club.com/forums/showthread.php?t=13245
^ +5whp gains for drop-in filters. ^
I don't know what to believe anymore. I've been seeing and hearing the same pro/con arguments for 20+ years now and still no concensus. You won't sell many drop-in filters if they don't add something so the motivation to produce positive results is certainly there. It wouldn't be hard to provide slightly more favorable test conditions, even unintentionally.
Still, in theory there should be some slight improvement in VE by reducing the airflow resistance of the filter and it is well known that oiled cotton gauze has lower resistance than oem paper. OTOH OCG also allows more dirt to pass so there really is no free lunch here. In the end I went with K&N hoping that they know the correct balance between increased airflow and filtration efficiency.
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They did something wrong if they saw any power gain with a drop in. I don't sell product. I just dyno tune and test. Tested it. Zero. Back to back.
If anyone wants to send me something to test.... id be happy to.
If you wanna see if your filter is the restriction its pretty easy without a dyno. Go on ebay and buy a magnehelic pressure gauge or differential pressure gauge. Something in the 8 to 15 inch of water range and map your induction system.