Anyone experience a high pitched whistle when slightly feathering the gas? I think i've seen it mentioned before but haven't seen a solution. Is it the nature of the filter element, or is there an air leak/hole somewhere? I can't figure it out.

 

Mine does the same thing and I'm sure nothing is loose. I feel its just the nature of the beast.

 

Whistle? I'd say mine screams! :smile: :smile:

 

same here as well...its for less than a second and only at certain throttle position....if it whistles, just give it some more gas!...lol. But I think this is normal

 

isn't that the sound produced by the supercharger?


MINI-A-NATOR

tony

 

I think what you hear is the Whistle from the Throttle body. You just can hear it with the ALTA because of the open design of the system. Reminds me of the Throttle plate whistle you would hear on a Carburated car with the Air Cleaner off.

 

>>I think what you hear is the Whistle from the Throttle body. You just can hear it with the ALTA because of the open design of the system. Reminds me of the Throttle plate whistle you would hear on a Carburated car with the Air Cleaner off.


ahhh.... ok, i can believe that. Thanks! :smile:

 

Related question: does the bypass valve whistle? And yes, they all do it to varying extents. It's not a Bad Thing, per se.

Jeff

 

Yep, it's the throttle body. You hear it easiest with the ALTA because its' UNIfilter flows the most of current CAI's out there. The sound of beautiful induction music!

 

love it nature of the beast.
doug

 

I had a thread on this topic a while back. It is indeed the air passing across the butterfly valve in the throttle body. It takes a little time but you get used to it. I now love the sound.

 

Did you know the Alta airbox has MANY leaks?

If you're hearing a whistle it IS probably the throttle body, but it may also be air sucking in through god knows what gaps. Take a work light at night and wave it around the outside of the airbox while looking inside it and you will see MANY BIG HOLES! Use a high quality duct tape (after a wipe with alcolhol) to seal them, and stuff 1/2" to 3/4" thick foam under the lower section plastic box too: there are BIG gaps under it! NOW you are getting the cold air you paid for.

Next, try using a thin aluminized insulation foam on the outside of the steel box and further isolate engine heat for a better time! Search at http://www.McMastercarr.com for silicone insulation foam with aluminum and buy a foot of thte stuff. That is enough for one airbox. It really works! Looks damn trick too!

 

I replaced my BMP Intake to the Alta just for that sweet sound. And man does she scream with pleasure now!!!!!

 

I always assumed it was the whistle was the throttle body reacting. I think it sounds like the angry bees nest under the hood.

 

My Monster MINI intake does the same whistle sound in the 2800-3100rpm range.