I noticed yesterday, in a third gear pull, my car started losing boost around 5700, and dropped quickly until redline. I have the boost peak at ~20psi, and drop to ~18psi, but it dropped to about 15 before I shifted. I still have my stock CBV, and my boost controller is routed to the airline going to the CBV. Could this be the problem? Should I switch the line back to the wastegate actuator? Or is this the CBV, I never noticed this drop before.

 

bump

 

You running the stock BOV? It could be leaking due to more pressure ....

The stock plastic Blowoff is known to leak =T

*shrug*

 

My stock bypass valve leaked right at the RPM range you're talking about. There's a post on these forums about how to pressure test them. But I bet that's the culprit.