[Odan.be]

Today i was driving with my windows open , when i heard this faint high pitched noise/whistle.
It only occurs in first gear. never in 2 - 3 - 4 etc...

You can hear it in my video from 0.06 sec

Anybody knows what that is ?

[ferocity02]

Diverter valves? I hear a psss sound when you shift, but I also hear it slightly when you shift to 3rd.

[Odan.be]

Originally Posted by ferocity02

Diverter valves? I hear a psss sound when you shift, but I also hear it slightly when you shift to 3rd.

No the "psss" sound you are refering to is the sound of my Tial BOV , i don't have any diverter valves any more.

The sound i am refering too is actually this sound i think
In this clip you can hear a clear whine at 1:34 and 2:45 when he lets of the revs..

I guess it is a "normal" sound, but i wander what makes it ?
Vanos ?

[ferocity02]

Mine makes that same noise, although not quite as loud as that. I've always wondered what it was though, maybe an accessory like the HPFP, power steering pump, etc.