Originally Posted by addiction
Originally Posted by telhonda1
same as me to get it to flutter louder you need to go to efi mate, for some reason efi i so much louder. i take it you have no dump valve cause that will stop the flutter plus a big ass induction kit will help. the noise itself is the air from your turbo forcing its way back through your induction kit hense why a dump valve is not good for the noise. wish tehre was a cheaper way thou there was a fiesta trb at engine advantages when i was getting a set up and that flutterd fukin loud!!!!!
the correct name is compressor stall,most peeps call it chatter. it is caused by the back pressure created when the throttle butterfly closes while on boost(changing gear,backing off) this back pressure stalls the compressor wheel. MFI will chatter but nowhere near as loud as EFI because the metering head muffles the sound.
or rather the AFM, below the metering unit muffles the sound