CAI cone question - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 04-17-2007, 03:00 PM
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CAI cone question

im curious about something, ive heard a lot of cars that have a CAI that seem to "whistle" or "woosh" when you step on it almost like a turbo spooling up, it sounds awesome, is there a specific cone or design that will do that? the intake on the jetta and my old 325 had a really nice growl sound to them, but not wooshing/whistling sound to it? this make any sense? any help would be appreciated...also, sorry if i posted this in the wrong place

thanks!

edit: now that i think about it, it may be a vacuum leak on some of them, but i have heard that "spooling" sound on other friends cars, but no vacuum leak


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#2 (permalink) Old 04-17-2007, 03:07 PM
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the reason that it makes that "woosh" sound (i believe, dont quote me on this lol) is because you no longer have that big intake box there, you just have a single pipe going striaght to your trottle body. Now your throttle body has a butterfly valve in it. and when it opens full throttle (for mine its around 3000rpms) you can start to hear the air.

it might also be the blowoff of the air. i know thats why it makes that noise with turbos (hints the need of a blow off vavle) and it might be the same for this just not at the same extent. but im sure my first theory is corret.

the reason you dont hear it on other cars just might be because its a diffrent car. all cars are not created equally

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#3 (permalink) Old 04-17-2007, 07:27 PM
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Yeah, when I put my K&N CAI on my 325i it made it sound like there was a small v-8 under my hood at WOT.

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#4 (permalink) Old 04-17-2007, 07:52 PM
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when i had my dinan cai on my 325 it made taht sound...

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#5 (permalink) Old 04-18-2007, 10:30 AM
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its not the growling sound that a cone filter makes on bmws I6's or the woosh of a blow off valve, it sounds more like a spooling turbo


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#6 (permalink) Old 04-18-2007, 02:18 PM
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hmmm. mine makes that noise too. almost like a whinding noise right? i have always thought it was my belts. but who knows

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#7 (permalink) Old 04-18-2007, 08:46 PM
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it's just the sound of the incoming air, stock airboxs have baffles and other things to muffle the noise

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#8 (permalink) Old 05-15-2007, 09:22 AM
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This is not related to the sound but fits in the subject so instead of creating a new thread for nothing... AFE says the CAI can add up to 42hp, im not very familiar with tuning but I find it very hard to believe an CAI can give that much kick. Am I wrong? here is the link: https://www.shopatron.com/product/pr...54-10171/534.0

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#9 (permalink) Old 05-15-2007, 02:19 PM
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This is not related to the sound but fits in the subject so instead of creating a new thread for nothing... AFE says the CAI can add up to 42hp, im not very familiar with tuning but I find it very hard to believe an CAI can give that much kick. Am I wrong? here is the link: https://www.shopatron.com/product/pr...54-10171/534.0
Hell No! I call complete B.S. on that. A CAI by itself can not add 42hp and 32ft-lbs to your car. My K&N says it adds like 12-18hp at the crank.

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#10 (permalink) Old 05-15-2007, 02:51 PM
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So what do you guys recommend for a 1998 328i?... Im also doing the m50 manifold conversion.

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#11 (permalink) Old 05-16-2007, 01:57 AM
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anything will work just fine. in all honesty a debaffled airbox will work probably better than any CAI you can put on there.

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#12 (permalink) Old 05-16-2007, 01:39 PM
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yeah debaffled with a k & n drop-in filter would be good.



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#13 (permalink) Old 05-16-2007, 01:56 PM
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cosmosracing intake? Any good?

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#14 (permalink) Old 05-16-2007, 02:30 PM
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No. Don't go with Cosmos Racing.

Go with Cosmo Racing
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Similar name, different companies.


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#15 (permalink) Old 05-16-2007, 03:46 PM
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So what is better, debaffled box with k&n/AMSOil air filter or Cosmo Racing CAI? Performance wise I have read different opinions some saying you gain power with debaffled box some say you only get a better sound. Or say i get the pipe from Cosmo and add AMSOil filter.

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