I recently purchased the IPD ECU which increases the boost to 15psi. Works great but at WOT it will spike to 15psi then slowly decrease to 10psi which makes me think I have a leak somewhere. However, at 3/4 throttle it holds 15psi just fine. Does anyone have any suggestions? I think it could be a leaky cbv (compressor bypass valve), but the fact that it will hold 15psi at 3/4throttle makes me think otherwise. The car does feel faster at 10psi WOT compared to 15psi at WOT. Thanks

1997 Volvo 850 T5 Wagon, Auto.

 

how are your intercooler hoses? it could be your cbv, i uped to the IPD cbv seemed to help a lot. as well as silicone IC lines my boost stays consistent now, and poped a line off once so far lol