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Originally Posted by 2old
No... Large diesel turbos spool slower and they wouldn't give you as much pressure given you probably are not generating enough exhaust gases to drive them properly (consequently have less boost).
Unless at WOT at 7000 RPM your Turbo cannot reach enough pressure to open your wastegate, there really isn't much point to a larger turbo.
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Point a larger turbo is more power so there is a point. But like you said a 30psi tubo is gonna take more exhaust gas to spool it up. You could always go supra style and small turbo to spool then taken over by a larger one but most find this impractical. I would ask around for the specs on the turbo then talk to some ppl on 3si about how much lag this would be to get boost. And the fact could you motor handle as much as that thing is gonna put out. Once again the old fashion anything is possible with money comes in hand.