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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-31-2015, 05:44 PM   #1
mixmastermaize
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Join Date: Mar 2015
Location: San Rafael, CA
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My Ride: 2002 325ci
K&N intake whistle?

A couple weeks ago, I installed a K&N intake into my 325ci (specifically, this one: http://www.knfilters.com/search/prod...x?prod=57-1002). Ever since, my car has been whistling under light load (i.e. staying at speed, but not while getting up to speed), and when taking my foot off the throttle. I thought this sound was a vacuum leak, but I've since taken the whole system apart, replaced a hose clamp, and done everything I could to resolve the problem. Is this sound simply a characteristic of the filter, or should i just keep trying to fix the phantom vacuum leak?
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Old 08-31-2015, 05:59 PM   #2
Rob43
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It's simply a characteristic of either the filter or the fact that that this sound has always been there but the stock air box shields you from hearing it.

Try turning the MAF back n forth 90 degrees each time to see if you can lesson or kill this sound, I & many others have been successful at using this turning method.



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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 09-02-2015, 01:16 AM   #3
mixmastermaize
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Join Date: Mar 2015
Location: San Rafael, CA
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My Ride: 2002 325ci
First off, thanks for such a fast response! I went at it today and tried the MAF in all different positions, which helped the whistle a *little*. Are there any other special tricks I should try, or should I just suck it up and deal with the whistle?
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Old 09-02-2015, 01:55 AM   #4
Rob43
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Your stuck with it. Like I already stated, my guess is its Always been there & the OE box just covers it up.




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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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