Hello
Some times I'm very irritated that my car can not hold turbo pressure. I have BSR stage3 in my s60 2.4T, and I've talked with BSR technician on how many bar vill turbo build in stage3. His answer is that it will fluctuate between 0.9 and 1.2 bar,or 13 to 17 psi. Sometimes in 3 gears (65/70kmh) around 40mph,pedal to the bottom it lets 0.9, sometimes 1.0, and sometimes 0.7bar, but when I release the gas pedal and press again so builds it approximately 1.05,1.1,but newer 1.2bar,or 17psi.? Wastegate arm is set, TCV is (OEM) and is 5 months old. Could it be that the dump valve / spring can not hold pressure?
Regards Edi