Modifying boost controller

[bigun283]

I am trying to install a Turbosmart boost T on my friends diesel truck. I need the boost T to hold more than the 20 psi that it is doing now, looking for 65psi. Some have told me that I will need to install a stiffer spring. Does anyone know for sure how to do this?

 

[Burnett03]

65psi? thats a lot, even for a diesel.. a stiffer spring could work, but i think it would be better to get a boost controller made for diesels and high boost