High pitched whistle from new GTB2260VKLR turbo

[Leonpd150]

Hey,

I need some help. I have recently instaled a GTB2260VKLR turbo on my 1.9 TDI ARL PD150 Seat Leon MK1 . Since then I have noticed a really loud whistle from the turbo on spool it only starts at about 3000rmp and 2.0 bars of boost. I have airtec intercooler with 60mm pipework and firad 120% nozzles . The car is pulling great spool is quick but there is this loud whistle that annoys me. I have check and replaced all vacuum lines and tested the N75 valve witch seams to be fine i cant hear it clicking but wastegate arm is moving to its limit. Only thing I did wrong during this modifications is I put an 2.5" downpipe instead of 3" downpipe. Current tune is 2.6bar and around 90mg/str in driver wish at WOT. Max duration is about 28.5deg and SOI at 25.8deg

 

[Nam-uk]

record the sound and post it, just hope its not the turbo thrust bearings, my standard turbo was replaced a while ago but seat also sent an updated oil feed pipe tobe fitted with it from what i remember the inner diameter was larger if that helps

 

[Leonpd150]

no i doesent because its a ballbearing turbo that has oil feed restrictors

 

[Leonpd150]

SOLVED.

badly assembled turbo, the turbo whistles just before it starts to surge. I have bought this turbo from someone i wont name because i dont want to damage his reputation he will send me new turbo for free next week and that should be it.

keep you posted

 

[smutts]

Surge is due to aerodynamics. Too much pressure, too little airflow.
The blades of the turbo are stalling.
Good luck with your replacement.

 

[Leonpd150]

New turbo didnt solve the issue I dont know what to do next . Pull head and see if anything is wrong with it?

 

[Alexis27]

If the old one was badly assembled what makes you think the reaplcement isn't as well?

 

[Leonpd150]

i am going to try friends turbo next week and we will see