So eventually got the DV replaced on our stage 1 VRs petrol. It showed no fault codes and my mechanic who knows these cars well felt it unnecessary.

 

I had felt that the car was not as brisk and our fuel economy  was disappointing even when cruising at 31mpg

 

When removed it had no visible tear or holes.

 

Twice now on longer motorway runs at 70 I have got over 35, today 36.6. 

 

And the power is back, traction control is cutting in if too brisk in the acceleration from a junction, and in second gear on damp roads too.

 

Wish I had replaced it two years ago when I first noted the symptoms

 

Used the current OEM revision of DV btw

 

 

DV?

Dump Valve (seen it called a diverter valve too)

 

Early version can split/fail losing boost pressure hence reduction in power and worse fuel economy

15 hours ago, solwood said:

Dump Valve (seen it called a diverter valve too)

 

Early version can split/fail losing boost pressure hence reduction in power and worse fuel economy

 

Diverter or Recirculation valve is the correct term, as in the case of the TSI it is not dumping the pressure into the atmosphere.