I fitted Bailey DV26-D dump valve to my turbo coupe.
But, now when I´m driving, and if I back off throttle (change gears) under 3500 rpm, I can hear a sound comeing from my K&N Apollo kit, the sound like the DV isn´t opening and a part of the air is going back to the turbo. I can hear the DV sound from my Bailey DV, but it isn´t as loud as it is if I rev the car higher, over the aprox. 3500 rpm.
The sound that I get from the Apollo kit is the same that I got when my OE dump valve was broke and wasn´t working properly.
Is this normal or what? I´m running stage 1 remap, with 0,8 bar boost, and 1.0 bar overboost.