need help on possible dv fault

[maundy26]

ok i got a problem on my car that its dumping its boost when under acceleration only in 4th 5th and 6th and between 3k and 5k revs it dumps from 20psi to 10 - 12 psi then after 5k it goes back up to 20 psi. i have changed maf, and n75. so i have been told it might be dump valve fault. so if there is anyone in south Wales area ish and is willing for me to try their dv valve or standard valve. just for me to try as im spending money all over the shop trying to solve this. i have pluged code reader in and no codes.

cheers chaps

 

[<tuffty/>]

Its the ECU dumping the boost because it thinks it has a problem... this is typically an over boost issue... what did you scan with? generic code readers are pretty limited and miss lots of VAG codes... use VCDS as if its dumping boost as you say then there will be a fault code...

Might also help if we knew what the car was and what mods you have...

<tuffty/>