Hi Ken? Welcome from me too near Lincoln and no it’s not normal to hear a whistling noise unless you have a vacuum leak on the inlet manifold system somewhere. These are very common on the Z3 range. Usually it is one of the intake boots but not always. Where are you located please?, there may be a member local who could help you.
Tony.
Thanks I must admit it does sound like a turbo.It its pretty loud then maybe the previous owner fitted one of those stupid turbo-waste-gate sound-efffect things.
If its a background fairly quiet thing then maybe a split air pipe or seal somewhere around the air intake
Many thanks fairly busy for next two weeks after that I could have a run out one evening.Anyone in Notts area could have a look and listen to @Kenmac car? If you have time for a run out to LN1 I can.
Tony.
I will thanksOK, just give me a shout mate. I'm retired so if you have spare time in the week we could do that too.
Tony.
to the Forum.
Thanks Steve I'm free Wednesday and Thursday evening this week.Hi @Kenmac I'm not too from you, near j25.
I could pop round one evening to have a look with you if it helps. I'm not an expert but sometimes another person to bounce ideas of helps.
Kind regards
Steve

Hi and welcome from me in Sco
Hi and welcome from me in Scotland
Thanks