I am writing this on behalf of someone

He has a problem
When accelarating he can hear a sound which sounds like a wolf or blowing over a empty bottle i know my desciption is funny but that is the only he describe it.
It only lasts for a couple of seconds then goes away

Any ideas

 

This is a well known problem.
See here for details:-
http://www.sidc.co.uk/faq.htm#3.1

Loud noise between 2-4000 rpm which sounds like someone blowing over top of a bottle.

3.1 Dump Valves (aka Blow off Valves and By-pass Valves)
There seems to be a recognised problem with the 1997 specification car's dump valve. This does not shut properly under boost and thus vibrates giving the sound similar to someone blowing across the top of an open bottle. It has also been likened to a steam train whistle or ship fog horn in extreme circumstances!. Meanwhile the 1998 model seems to have a totally revamped and larger blow off system, but I have had reports that the problem sometimes still occurs.

 

Yep, its the blow-off valve / dump valve. For sure.

 

cheers m8

[Edited by miggs - 2/4/2002 3:16:59 PM]