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Turbo whistle or not?

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WhiteGTI:
Upon only WOT, i can hear what can be described as a very high pitched whistle coming from the engine bay. It stays at the same tone regardless of the revs, but only occurs during full throttle. It is pretty faint, but loud enough to hear and distinguish.

There is no whistle until about 3.5-4K revs. So during low down torque the whistle does not occur.

I've only noticed it recently, but because its so quiet it could have been occuring before.

The car is performing as per normal.

Normal? If not, any ideas?

Muchos gracias!  :happy2:

RedRobin:
....

Have you changed air intake system recently, Chris?

Or changed to aftermarket engine mounts?

WhiteGTI:
To be honest, I first noticed it after I took my Carbonio/engine cover off a few weeks ago.

So i figured that it was a slight air leak where where the airbox connects down to the throttle body or something.

But last weekend I took the engine cover off again to reposition it incase there was an air leak, and then put the Carbonio back on, but still the whistle is there!!

hmmmmm......

RedRobin:
....

I'm just thinking aloud here and you already know I'm not an expert on car mechanicals, but..........

It's possible that the sound was there all the time - The brain easily shuts off constant sounds - But you became aware of it when you removed the engine cover. When you refitted things your brain was then on full alert for the sound and so you homed in on it.

Methinks that if it was a leak, you might feel it via the reduction in performance even if only slight. The other way to check for leak effects is logging (I think!).
 

:smiley:

WhiteGTI:
^^ True yes!

I may see if the legend that is DomT is around one evening soon to do a quick log for me!  :innocent:

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