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You're not giving us enough information, so we can't give you a detailed answer...
"Diesel turbo" and "7psi" doesn't tell us jack shit.
At minimum, we need to know:
compressor wheel trim - inducer (minor) and exducer (major) wheel diameters
turbine wheel trim - inducer (major) and exducer (minor) wheel diameters
turbine A / R
Until you can give us these specs, others are only going to give you a WAG...
-Ted
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