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without water injection depending on the heat ... however .. psi will really depend on your setup ..meaning how hard your turbos are working / cylinder temps ( manifolds, stock motor, etc ) and how low you can keep the cylinder temps (intercooler, intercooler piping, water injection ) .. I also have widebands and EGT to monitor things.. if you really want to play and find your safe limit ... dyno the Z to safely find that limit for your setup and put some diagnostics in your Z ( I didn't check your profile ). 
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