Good answer CSIPSD
But I will tell you this... You will NEVER hear the wastegate opening.
OMG! Finally, someone else said it. I think I have said that same thing to over 20 people on the phone this week.
It is true, you will never hear the wastegate opening.
I dont understand what you meen buy the exhaust housing what is that.
The rusty cast iron section of your turbo. The wastegate (if equipped) bypasses excess turbine drive pessure around the turbine blades to prevent overspooling the turbo, and dumps it out the tailpipe. This is done on turbo applications where the exhaust housing is a bit small for the truck under hard throttle conditions. These "small" turbos are used sometimes as they tend to be better in low end (read: stop light to stop light) driving patterns- where people drive their trucks the majority of the time. The 97 had a fairly large turbine(exhaust) housing so drive pressures were not a concern. The 6.0 uses a VGT housing as Joe stated. This uses a varible (sliding) turbine vanes that expand as speed increases. This eliminates the need for a wastegate.
And the noise i hear is a hising sound. It hapens when i am at a light gruzing speed about 1500 rpm that is when i here it. and there is no mods done to my truck yet.
Could be a boost leak, could be turbo whistle if you have an open air intake, but could help more with a bit more information.
Do not wire your wastegate closed. If you want something better than a stock controller, try the https://www.dieselsite.com/index.asp...ROD&ProdID=457
TurboMaster. You get maximum response (as if the wastegate were wired shut), but control of boost and drive pressure on the top end.