I just Bouight a Cav Turbo and it has a bailey Dump Valve fitted. (Same as i had On My Calibra Turbo)
However if i rev the car up it will dump quite loud, but when i am driving you get no noise whatsoever. their is no vaccum pipe connected to the Std dump valve. so it cant be that this is working. so what can the problem be?
I have heard about some sort of a spacer shim to be fitted to the std dump valve, how do i check if this is fitted?