How does one distinguish if a wastegete is of the noisey variety by looking at it? Is there a way to tell without fitting it???

i think your a little bit confused here!

No I'm a lot confused. Its for a Sierra Cossie, whats the score with the zithering wastegate noise?

Perhaps you are not confused, but by the description you are giving, we are???
No idea what you are referring to??

I think he means wastegate "chatter"!

in my head it sounds the same as his "zither" explanation.

could mean "whooooosh" from those rather sad VTA dumpvalves though !!

:confused:

Andy

i wasnt aware that u could fit a noiser wastegate lol

surely he means gay dump valves??
they all make a nice noise if u throw them of the floor ;)

Yes, wastegate chatter, thats the one, whats it all about then?

If thats the type of noise you are after, then remove any dump valves that are fitted ( and block any holes it leaves ). Also, a good air filter, mounted as close as possible to the turbo. Air filter piping, can alter the noise a bit too.

stevieturbo, is this safe for the turbo (removing dump valve)?

is it safe to speed?

With td05 turbo no dumpvalve isn't a problem, makes 'intersting' noises depending on what you're doing.

Don't know about td04, I think they quite tough too.

VF22, 23, 24 and 28 forget it, say hello to fractured impellor wheel, later ones may have improved.

Dump valve stops shock waves and rapid pressure spikes going back into the turbo and doing in the compressor side. Some make a noise, some don't. WRC cars don't have one at all, but do have various sorts of Anti Lag systems which make more noises.

paul

What turbo will my 95 uk turbo have ????

TDO5 if i'm not mistaken :)