Max turbocharger boost

Hi. I have a 06 kj 2.8 crd. Need to know max boost. I use a gfb 3009 boost controller in parallel with the stock boost selenoid. This way if i throw 22 psi boost, just hits and then the selenoid tries to get it back. But i want to know the max boost in psi i can reach without throwing an overboost code

Just increasing boost won't do much on the CRD, you need to get more fuel mapped in too.