The infamous Turbo whistle...
 

Looking at videos and reading day in and day out on the world of turbos. I notice you have about 50/50 split of turbo cars that really have a distinct whistle to them and ones that dont.

What makes one make more noise than another? is it brand size or style? or mainly just exhaust setups?

That's nothing more than the pitch of the impeller blades influencing the distinct sound you hear. Impeller diameter would have an effect on that as well.

What you might be hearing is the sound of the wastegates and blow of valves. Some people run external wastegates and some internal. Externals make quite a bit more noise.

My turbo car sounds like a heavy breathing hoover vacuum cleaner. You hear the turbos spool, then the external waste gates start playing their tune and then when I get out of the throttle, you hear the blow off valves actuating.

someone posted a hilarious video of a guy who put a duck call on his blow off valve

Im running an external wastegate....open. Its going to be more of a roar than a whistle lol

Just got my new turbo put on and the new BWs480 is alot quieter than the old GTS76 was. But you can definatley hear the BOV more now!!

does running the wastegate into the exhaust make it more whistle than just loud air sounds?

wheres the video lol

http://www.youtube.com/watch?v=lZG0RS3mVBc

Funny

I'm putting the twins on soon, i'll keep this in mind.

This one is better!


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I had a used turbonetics ball bearing T76 I ran on my lt1 that whistled REALLY loud, that thing screamed compared to the GTS76 and TC76 I had on the same car. Running open downpipe also makes it whistle louder IMO.

/fail lol

dang, i dont know how to do it :(


http://www.youtube.com/watch?v=W_Qul7MiImk

here!~

I would like to know this as well. What gives the loudest whistle, lowest exhaust? Wastegate back into DP or vented? It seems returned back into the DP but I don't have a turbo setup yet so would rather hear from people with experience.

with the gate dump going into the down pipe you can hear the turbo better. with the open wastegate dump it sounds like a really bad high pressure exhaust leak( which is what a wastegate dump is actually) when you come into boost. I have tried it both ways and prefer the dump pipe recirculated, from inside the car you can hear the motor better

So can anyone really pinpoint the attribute that induces turbo whistle?

I know on my cummins truck it was a Silencer ring that I removed & it made a major difference.

Damm, there has been some OLD topics brought back from the dead this weekend.

Haha yes I've noticed a ton of threads being brought back up too. only thing I can figure is people have already tried most of the ideas that are being mentioned on here. as to the turbo whistle, I wonders that myself. just in my way home earlier I noticed an f150 like 4 cars up and his turbo was signing something fierce. I see it on alot of diesel guys. maybe one of our turbo gurus will chime in with even more info..

I hear ya, I have a 2011 Ram 4x4 2500 with the cummins diesel and it whines. I like it personally. :)

With the Garrett GT3782 (I think) that comes on 03-07 F series super duty trucks, the loud whistle comes from less blades on the exhaust wheel. 2003-early 2004 trucks has a 10 blade turbine wheel. Garrett put 13 blade wheels on the 2004-2007 6.0 and it got rid of the turbo whistle with straight exhaust