Wastegate Chatter

[Granta Gti]

A couple of months ago i changed the N75 frequency valve on my 1.8T to the ECS race one, since i have done that i get wastegate chatter, i like the noise but just curious what causes it ? 
I still have the stock bosch DV which i will be changing soon but wander when i change it to the forge 007 will i still get the noise i.e. am i only getting the noise because the stock one is shot?

[Wazzzer]

all of the above. It's not wastegate chatter anyways, it's the blades stalling against the now static air in the turbo

[tech1889]

You uprated your n75 for what reason ?? and didnt fit a 007p ??

The standard N75 is good for more bhp than you will be running.. and also the ECS 'race' valve im sure is just a N75 off a rs4 or similar..

[Granta Gti]

It's the one on the awesome website and someone was getting rid of theirs cheap so I thought I would try it and got the forge 007p to fit at a later date.

[tech1889]

I personally would keep the standard N75 valve.. i know someone with just shy of 400bhp on standard n75.. and if you fit uprated items the map should be adjusted and suited

[Granta Gti]

Alright thanks for the info guys 

[RTechUK]

1.8Ts dont suffer from wastegate chatter, the noise it the charge air returing back out the turbo and getting chopped up by the compressoe wheel and stalling the turbo. A faulty Dv will cause this sound and needs to be fixed asap.


PS
Sell the ECS (Audi TT) N75 valve and keep with the correct one for your car.