So 18 months ago i bought a GT28RS from a guy on the Coupe parts for sale page on FB, it was said to have done 8,000 miles.

Fast forward 18 months and i've just got round to fitting it as the standard turbo seals have gone.

Along with the turbo i also fitted a SIP, FMIC, 3' downpipe and changed a cracked manifold with a remap to come.

This afternoon the car woke up after 4 months of sleeping and sounded awesome, turned the engine off and heard this very loud metal on metal sound for around 10 seconds. It can only be the turbo as it's loudest by the air filter.

After a bit of research i see some people on pistonheads saying BB turbos often make this winding down sound and it's nothing to worry about.

I'm very paranoid as it's so loud but can i have some opinions?

Thanks

https://www.youtube.com/watch?v=ucNt74hIT5k&feature=youtu.be

Better video:

https://www.youtube.com/watch?v=1THmsd1avsk&feature=youtu.be

did you prime the turbo before starting the car and are you using a oil restrictor on the turbo oil feed ?

Had same sound, same turbo.....it last 5-6 sec no matter warm or hot engine.....
Just watch the video.....your sound lasts a little bit longer......

If its a blowing noise its normal. If you hear a very fine grinding could be the start of worn bearings.

The best way to describe it is like putting some metal balls in a metal pot and spinning it so the balls run around the wall of the pot... if that makes sense. It's not a blowing noise.



Yes to both, i don't think it's something that's occurred while i ran it. Could be wrong though.

Sounds like dry bearings from the video. Have you confirmed that oil is present in the drain to the sump?

Just taken the SIP off and had a good look.

Virtually zero shaft play, oil pressure is good, there is oil present in the return to sump, zero scratch marks, turbine spins well, the SIP was exaggerating the sound but it is still there just less prominent.

Will upload a good video of it later tonight.

Hopefully it's paranoia.

Better video...

https://www.youtube.com/watch?v=1THmsd1avsk&feature=youtu.be

That's a familiar sound for a ball bearing turbo, certainly more important that you can hear it spin down after shutting the engine, if it doesn't then you have a problem.

I can breathe deeply. Thanks!