Strange intermittent screech noise on N55

[corp]

So after my poor results yesterday at dyno run, I decided to do a quick visual inspection to see if I could find anything relating to boost leak (still not sure what I am looking for. Still need to see if I have codes coming up).

Whilst I was removing engine cover bits and etc, I heard this strange intermittent noise. Sounds likes something eletrical is trying to do something. In fairness, engine was still a little warm so I assume it might be the electric water pump but I am not sure. First time I heard this sound.

Not really in the mood to work on the car today so decided to put everything back in and will check codes before I again attempt to find any issues.

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[corp]

Do these cars have some type of auxiliary oil lubrication for the turbo once the motor is switched off? Perhaps that is what I was hearing.


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[//M SPORT]

What was the dyno result?

Sounds mechanical on the video but difficult to tell.

If there nothing obstructing the fan. Perhaps the car was trying to cool down and the fan motor is on its way out?

 

[corp]

Dyno results were poor.

I am about 15-20% below what I should be getting with a stock vehicle.

Some of the guys there said they think I have boost or vacuum leak. I don't have a DCAN cable yet to try read codes so I am only guessing what is wrong in that regard.

Fan wasn't running. The motor wasn't that hot. I had virtually just got to optimal temp then I stopped at home on Sunday. When I waked out about 10min later to start taking checking the motor, that is when I heard the noise.


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[sash]

That is a weird noise, i hope you get the root of it soon. Here i thought it was the normal electrics that goes off after 15min....