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Old 11-06-2012, 11:38 PM   #58
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Originally Posted by xluben View Post
An electronic boost controller uses a pulse modulation to control the wastegate. It cannot simply "hold it open" at a specific spot. It has to open and close very rapidly. If it's quick enough you don't hear it much, but usually with an external dump it's pretty obvious. You can still hear it in your video, but only slightly. It is actually impossible for an EBCS to not flutter. Certain things may make it less obvious, but it is pulsing, that is how it works.

A MBC will not flutter. It is a spring loaded ball that lifts depending on how much pressure it sees.
If you think you can hear flutter in that video, you are fooling yourself. I ran it with a MBC for months, and it didnt sound ANY different.

I understand it's sending pulses to the wastegate, but it's doing it extremely fast. You shouldnt be able to hear it

I dont hear any flutter in this video either, although like you said, most of the videos on youtube you can hear it pretty audibly.

Would the quality of the solenoid have anything to do with how fast it's pulsing, or would that be completely controlled by the ECU?
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