My dump valve won't go tsssssh ?
Fitted a Bailey DV26 to my car at the weekend.
On gear change you get a small dump, but its a very quick chink kind of sound.
I must say the engine response is great and boost levels are held better than before.
My only concern is that when out of gear and you rev the engine you get a echoey wastegate chatter noise.
Is something wrong ?
I have played about with the adjustment on the actuator.
This is on my 888 astra.
As they are vaccum activated, are you sure you are getting enough vaccum to work the dump valve correctly ?