High pitched sucking/blowing sound

[mrc300]

182, standard airbox with ITG and a KTEC S/sports with standard Cat.

Very noticeable at 3000-5000rpm under acceleration. Best way to describe it is that it sounds a bit like a turbo spooling up, definitely not meant sound like this.

In my experience I'd say this was an exhaust blow, Manifold to Cat gasket?


Any ideas?

Thank you in advance

 

[Joe R26]

I'd say manifold to cat gasket. Mines the same. It opens under acceleration. But IMO a worn engine mount could contribute to it, as when you accelerate the engine pulls forward more than it should.

 

[mrc300]

I think I'm going to book it in with Dan at 519 to have a look, as I don't have access to a ramp. Interestingly the previous owner had new tyres fitted in September at a tyre and exhaust fitted who commented that they thought the exhaust was blowing, yet when they looked they couldn't find the issue :/

 

[Joe R26]

I put a new gasket kit on mine and it still makes the sound. So I've replaced my mounts apart from the top one which is knackered and is on order.

 

[mrc300]

Have you got a decat and did you use a genuine Renault gasket kit?

 

[Joe R26]

Yeah I did use a genuine one, it does it with cat on or decat on.

 

[mrc300]

How strange, anybody else have other experiences?

 

[KevF182]

yep, quite common.

I've replaced gasket kits (down pipe to cat) and tried different clamps (on the cat to system joint) and whilst it still it isn't perfect I have managed to align everything (without resorting to sealants) to get it so that it is nearly right for the last 6 months... i.e nobody else can here what I hear so it must just be because I'm a picky git and have obvously become obsessed with this fault!