Funny noise

[Anonymous]

I've noticed on my car and even more so recently there is a noise almost paralell with my dump valve, I have an hks ssqv but even with it removed the sound is still there .

Its a fluttering lower pitch sound just like a dump valve thats activated when I release the accelerator .

When I release the accelerator quickly it makes an awfull sound, like someone scratching 2 rocks together and then it faids out with the usual flutter .

I dont have a 2nd dump valve, its a standard turbo, the sound dosnt cause any performance problems afaik, I do have a front mount but the sound was there previous also, its just had a rebuild so I wouldnt have thought there are any air leaks .

Its not really a problem but its annoying not knowing where its coming from .

Any help would be great, cheers

 

[Keira]

The fluttering is air passing back through the blades on the turbo.

Wheres your ssqv fitted ? is it fitted on the pipe that comes up from under the plenum ? IF its on a flange on your intercooler pipe you may still have the standard one fitted.

The two rocks being rubbed together noise i havn't got the faintest idea what you're on about

 

[Anonymous]

The ssqv is fitted in the original valve position on that pipe from the plenum, are those suppose to flutter also ?

Also the scraping rocks sound is hard to explain but its the same sound as the fluttering I get, just not fluttering, starts off a solid sound for a second or so after I've let off the accelerator then as it faids out it flutters .

 

[Anonymous]

I would suggest that you check your engine mounts, as the sound sounds like the engine and gearbox rocking when decelerating.


Gino

 

[Fast Guy]

Was the noise there before you had the rebuild?
The fluttering noise could be wastegate chatter.

 

[Anonymous]

Yeh it was there before the rebuild .

I wouldnt have thought it was engine mounts or anything as it gets louder with more boost .

Whats wastegate chatter ?

 

[Shaun]

Was the noise there before you had the rebuild?
The fluttering noise could be wastegate chatter.

I would tend to agree with Fastguy,sounds like the wastegate :!:

 

[Anonymous]

If I took a gues and agreed with you there, is this a problem that I need to get looked at ?

 

[Fast Guy]

Wastegate chatter is normal, you hear it more if you have an induction kit fitted. The standard airbox tends to cover the noise.

 

[Anonymous]

Ah, I have an hks air filter and a hi-teq cold air induction kit (sounds great btw 8) )

Thats probably why I've noticed it much more lately .

Thanks alot for the help guys