so my s has developed this whining noise.
Ive google and searched and cant come up with anything,

it will still make the whine sound in neurtral if I rev the motor.

basically sounds like a supercharger.

ive uploaded a video, but it is abit difficult to hear over the engine noise, you can mainly here it when I decelerate.
[media]http://www.youtube.com/watch?v=GY-8XDzxhfs [/media]

any help would be much appreciated.

 

I also get this, but thought it was sort of normal....

 

perhaps the alternator belt. Check if the belt is not warn out

 

Bearing in the tensioner or AC compressor maybe.

 

ok cool, ill check out the tensioner and compressor with a stethoscope tomorrow. may as well replace the belt too.

 

How sick would that be if someone broke into your S and installed a S/C overnight.

 

Keep us updated on the whining 3AM, if you find the fix.

 

From the video it doesnt sound like a supercharger. Could it compressor whine from the air con?

 

well the accessory belt is showing some minor signs of wear some very small cracks, so ive ordered another.

Honda australia wanted $118AUD + having to get one in from japan.
non genuine belt was $48AUD in stock monday.

I'll update on monday when the new belt comes in.

 

I get that occasionally. Seems to have started after I installed an aftermarket clutch, but then again I owned the car all of two months before getting sick of the stock clutch. Belt and everything else are good. Happens when the engine is fully warmed up and I've been driving pretty hard.