K&N Filter hissing noise

razor4077 · 6th November 2006, 00:04

Ok, I've finally fitted the K&N on my car. It's a universal (conical) filter with a custom intake pipe, that I got from Viper.
While I think there is a slight improvement in performance (not sure if its the placebo effect or not!), I am a bit worried/curious about one thing...
There is this "hissing" noise coming from the filter - especially while idling or at low revs. It's replaced by a great growling sound at higher revs.
Is this normal for these filters? Or is it something I need to be worried about?

Razor

A S H V I N · 6th November 2006, 01:26

that is not a problem bro .. its called breathing noise .. basically while the car is running and when you are stepping on the accelerator air is being sucked in .. the sound is being created while air passes into the filter .. at higher revs the suction is more hence more noise ..

cars fitted with stock replacement filters which are placed in the OE filter box do not make this noise because the filter is enclosed .. since yours is a universal one and remains exposed the noise is noticeable ..

personally , i love to hear the breathing noise .. sounds nice

viper · 6th November 2006, 08:40

Hi Razor,

Like ASHWIN said its absolutely normal. Thats the best part of the Conical Filter.
Also when you use it for a few more days you will see the gains a bit more.

Viper

speedzak · 6th November 2006, 13:04

Boss! You're getting the best sound from the filter. Induction noise! I prefer it more than exhaust growl.

@Viper. How will the filter gain better performance after some time?

hydrashok · 6th November 2006, 13:27

Hmmm... Every day I see something that makes want to switch from my stock-replacement K&N to a universal or extreme. Decisions, decisions...

6th November 2006, 00:04	#1
razor4077 Senior - BHPian Join Date: Sep 2006 Location: Mumbai Posts: 1,882 Thanked: 298 Times View My Garage	Ok, I've finally fitted the K&N on my car. It's a universal (conical) filter with a custom intake pipe, that I got from Viper. While I think there is a slight improvement in performance (not sure if its the placebo effect or not!), I am a bit worried/curious about one thing... There is this "hissing" noise coming from the filter - especially while idling or at low revs. It's replaced by a great growling sound at higher revs. Is this normal for these filters? Or is it something I need to be worried about? Razor
	() Thanks

6th November 2006, 01:26	#2
A S H V I N BHPian Join Date: Apr 2006 Location: Cochin Posts: 257 Thanked: Once View My Garage	not to worry that is not a problem bro .. its called breathing noise .. basically while the car is running and when you are stepping on the accelerator air is being sucked in .. the sound is being created while air passes into the filter .. at higher revs the suction is more hence more noise .. cars fitted with stock replacement filters which are placed in the OE filter box do not make this noise because the filter is enclosed .. since yours is a universal one and remains exposed the noise is noticeable .. personally , i love to hear the breathing noise .. sounds nice
	() Thanks

6th November 2006, 08:40	#3
viper BANNED Join Date: Mar 2005 Location: Mumbai Posts: 1,773 Thanked: 19 Times	Hi Razor, Like ASHWIN said its absolutely normal. Thats the best part of the Conical Filter. Also when you use it for a few more days you will see the gains a bit more. Viper
	() Thanks

6th November 2006, 13:04	#4
speedzak BANNED Join Date: Mar 2006 Location: India Posts: 4,347 Thanked: 27 Times	Boss! You're getting the best sound from the filter. Induction noise! I prefer it more than exhaust growl. @Viper. How will the filter gain better performance after some time?
	() Thanks

6th November 2006, 13:27	#5
hydrashok Senior - BHPian Join Date: Aug 2006 Location: In my Office Posts: 2,528 Thanked: 17 Times View My Garage	Hmmm... Every day I see something that makes want to switch from my stock-replacement K&N to a universal or extreme. Decisions, decisions...
	() Thanks