[urq] Turbo/wastegate whistle: how and why?

[Maurits Jonkergouw]

Where exactly does the loud whistling noise under boost come from? i.e. how is it technically possible for the turbo making such noise?

Could a shot WG diaphragm causing this whistle? I know I only have 0,45 bar / 150 BHP and the whistling noise is getting louder each month...

Also, could a wrong or wrong adjusted WG spring cause the turbo to whistle?

Any thoughts?

Thanks

Regards,
Maurits

1986 GV (Swiss WR) with 200K km original turbo/wastegate...
1985 CGT KV
1982 GL DD