Hi. When I bought my 9 I was getting really bad cavitation when letting off the throttle. I bought a forge DV (because I had one on my old LCR which worked nicely) and the problem seemed sorted, the recirc was nice a smooth. Recently I've had quite a lot of work done (cams, rods, intake, EBC, turbo elbow, remap) and now when it's building boost I can hear a sort of pulsing fluttery sound. It's more noticeable in the higher gears. The tuner who mapped it said it boosts to 1.8bar and holds at 1.6 on his external boost gauge he uses for accuracy. When he was looking over the car before the work was done he said he noticed the forge DV was on the wrong way. I fitted it and it was working fine but he's a well known tuner so I didn't doubt it. Firstly, is it possible the DV was on the wrong way round which made it harder for the piston to be pushed open, therefore making it hold boost better? Secondly, I've heard of people removing the DV altogether. I'm no professional but I don't see how that's a good idea, but could I block the DV holes and then go for a quick drive and if the noise is gone I know it's the forge DV not holding boost, or would that be bad for the turbo because it couldn't recirc?

Thanks

 

No one has an opinion?

 

Do a boost leak test you should be able to hear of its dumping boost.

 

Ok, thanks