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Discussion Starter · #1 ·
I’ve got a whistling recirc valve on very lite throttle (about 70mph), I’d like to to know where does it whistle from is there a vent pipe or something or is it an internal noise
 

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ST225 - CP340
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1,114 Posts
I’ve got a whistling recirc valve on very lite throttle (about 70mph), I’d like to to know where does it whistle from is there a vent pipe or something or is it an internal noise
It'll be from the diaphram inside most likely (though someone with more knowledge will advise better no doubt :D) . Totally normal though for the stock valve
 

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Mike Mk2 ST225
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2,589 Posts
where does the small rubber hose coming off lead too
I believe it goes up over the engine to the underside of the plenum.

That whistle is why some people upgrade- and once I upgraded I got a little bit of turbo flutter- sounds cooler but is technically worse for the car
 
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