C15 Camshaft problems?

Thats your low boost, the wastegate on a MBN opens at a much lower pressure than a 6NZ but the solenoid valve prevents boost signal to the wastegate until the desired boost level is reached, therefore you still get boost. With the wastegate connected straight to the intake manifold you are opening the wastegate was soon as the boost overcomes the spring pressure in the wastegate actuator. The simple way to fix it is to space wastegate actuator back to increase the spring pressure in the actuator, this increases the boost pressure required to overcome the spring and open the gate. If you have a pressure regualtor, hook it to the wastegate line and space the wastegate actuator back until it just starts to open at about 18-19psi. If you go to far you can overspeed the turbo, having said that I know of a couple of C15s that had the wastegate hose blocked since new and have never had turbo problems but thats more good luck than good management.

 

I can't offer anything to this except I feel for you and were I there I would just say "Oh Man!"

Makes my little head replacement seem like a trip to the park.

 

20 to 30 degree higher , a mechanic told me if i wanted the tranny to last i should leave wat the maker put on it

 

I noticed the same thing when I put that cam in my truck, went from 39psi to 33. Did you ever get your boost back?

 

In regards to you fuel pressure, the pump on the front of the engine can go bad and NOT show up on a computer check...the cam question, I suggest you call Pittsburgh Power. Bruce and his guys build a LOT of horsepower in a lot of different engines and are very good at answering questions. 724.360.4080