[Computer_Joe]

i was just curious what causes the turbo's high pitch scream sound. is it high boost on the turbo, impeller speed, or the wastegate?

the reason i ask is because i know of 2 03 cobra mustangs running the same size turbo, and 20lbs of boost on both. but you can't hear the turbo on one of the cars, and the other screams like a jet.

i love that sound...

 

[gasguzzler]

Impeller speed and compressor cover design seem to play the biggest factors, are they both running the same air cleaner set-up? Put a big K&N cone filter exposed on a Buick Grand National and you'll hear a day and night difference on the sound of the turbo.

 

[Nativeson]

The anti-surge covers make more noise. Mine is very whistley.

 

[coupe]

An out-of-balance turbocharger will whine pretty bad. If it's screaming really loud, it might not have much longer to live.

Believe it or not, the turbine wheel is a source of much of the high-pitch sound. The exhaust pulses "ping" the blades and as it goes up in RPM, so does the pitch.

 

[DMEYER]

Ihave no muffler on mine now and it screams, as soon as i put my muffler on it it is dead quite.

 

[IMPATIENT 1]

Ihave no muffler on mine now and it screams, as soon as i put my muffler on it it is dead quite.

ya otta hear the 5in i.d. 12in long dumps on the s475's in the boat, its deafeninging inging :-D sounds awesome though, nice change from a blower whine it made last summer

 

[Computer_Joe]

i want to be able to hear it but i do not want it stupid loud like my N/A motor with bullets. do most of you guys run the down pipe open, or do you put like a 4" dynomax bullet on it? its a s480 80mm with a 4 inch down pipe.