Can someone explain which valves are which and where I can find them on my 1.8TQ A4 B5?
The BOV I have found stuck under the engine and I believe recirculates un-needed boost back through the system to keep the turbo moving in when I change gear or throttle back.
The wastegate - allows the turbo to vent excess pressure outside the system?
An N75? Every other thread seems to suggest changing an N75 - what is it and where is it?
If there are other boost/turbo related valves anyone could tell me about it would be appreciated.