hill79

My cars developed a 'hiss' which sounds like its coming from underneath the gear lever - so presumably from the gearbox. Its more apparent in 4th and 5th and the pitch goes up with engine speed, however if I back off the throttle completely it goes away. There is still a faint hiss while the clutch is disengaged, but nothing like as loud as it is in-gear. In neutral - no hissing at all, but I can get the hiss to happen if I push the gearstick either left or right from the neutral position with a little more force than I would usually.

Gear selection is fine (the usual stiffness when cold but fine when warm) and the gears never pop out, clutch can be a bit juddery at low RPMs but no more than (I've read) is expected with Imprezas. There's a faint whine in the gears from the gearbox, but nothing alarming or out of the ordinary - the hiss is something else on top of the usual noises I think.

I'm going to take it to a local specialist for him to have a look, but I'm curious as to what it might be and would like to go and see him armed with some suggestions - I've next to no understanding of gearboxes so don't really know where to start! The cars a 2001 Bugeye WRX, on standard (as far as I know) clutch and flywheel.

hill79

local specialist says its the turbo and TD04s are notorious for being a bit noisy... newbie mistake!

K3ogh_sti

i have a the same issue :s on my05 sti, exactly the same syptoms but i would say its more of a little whistle type noise??

trails

iTrader: (41)

snakes.

Infected by sti

iTrader: (6)

sssssteeeee

as trails said, S N A K E........ could try a gearbox additive??? saw dust ive heard is used by garages that sell cars. lol well thats what i hear.

leewrx2002

This sounds like the same problem I am having on my 2002 WRX see
https://www.scoobynet.com/drivetrain...box-noise.html

I am looking for someone local (north east) to sort it...

marshall332bhp

Alyn at AS Performance. Drew or lad called fin all local and highly recommended. Join tts or nesf for contact details. :-)

hill79

To be fair I haven't checked for snakes...

The guy I use is also on the NESF forum, Andy Kindon based in Chester-le-street. He said a whine would indicate diff/gearbox issues but that its a very obvious whine rather than the hiss I'm hearing, which he's sure is just the turbo being a bit loud which is typical with these - I'm just not used to being able to hear things like that!

marshall332bhp

Can always try one the others I mentioned for a second opinion. Av seen his name before and always with good comments. I no what you mean though. When you hear a noise it is unsettling

leewrx2002

Yeah, I know what you mean about the hissing sound, but this sounds more like a bearing and the noise will "bounce" on and off with the accelerator, the way a diff sounds. That's why I'm not sure its the turbo...?